Question 1

Which of the following confidence intervals provides the greatest level of confidence?

Accepted Answer

A)  90% CI 
B)  95% CI 
C)  99% CI 
D)  It depends on which statistical procedure is used 
A)  90% CI 
B)  95% CI 
C)  99% CI 
D)  It depends on which statistical procedure is used C

Question 2

A basket contains 25 balls: 5 polka dotted; 9 plaid; 3 striped; 8 solids. The probability that a ball selected at random is polka dotted is equal to which one of the following?

Accepted Answer

A)  3/25 
B)  5/25 
C)  8/25 
D)  9/25 
E)  Cannot be determined 
A)  3/25 
B)  5/25 
C)  8/25 
D)  9/25 
E)  Cannot be determined D

Question 3

A random sample of size 50 had a mean of 5 and a standard deviation of 1. First calculate the standard error of the mean. Then calculate the 90% CI for the mean.

Accepted Answer

$\begin{array}{l}
\sigma_{\bar{x}}=\frac{\sigma_{x}}{\sqrt{n}}=\frac{1}{\sqrt{50}}=.1414 \
95 \% C I=\bar{X} \pm 1.96 \sigma_{x}=5 \pm 1.645(.1414=5 \pm 1.786=(3.214,6.786)
\end{array}$

Question 4

A researcher collects data from every other employee in the human resources database. Which of the following sampling methods is implied by this scenario?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 5

A researcher wants their sampling method to be such that every 15th person through the door is selected. Which of the following is the most appropriate sampling method?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 6

If the standard error of the mean is 25 for n = 50, what must the sample size be to reduce the standard error to 20?

Accepted Answer

None

Question 7

A researcher collects survey data from students who attend class on the day the survey is distributed. Which of the following sampling method is implied by this scenario?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 8

A researcher wants their sampling method to be such that every 30th person in the population is selected. Which of the following is the most appropriate sampling method?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 9

A researcher is surveying speech-language pathologists (SLP) on their perceptions about communicative devices. The researcher wants their sampling method to be such that every SLP has an equal probability of being selected. Which of the following is the most appropriate sampling method?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 10

Which of the following confidence intervals provides the lowest level of confidence?

Accepted Answer

A)  90% CI 
B)  95% CI 
C)  99% CI 
D)  It depends on which statistical procedure is used 
A)  90% CI 
B)  95% CI 
C)  99% CI 
D)  It depends on which statistical procedure is used

Question 11

A researcher is surveying university development officers regarding their satisfaction with alumni giving. The researcher wants their sampling method to be such that every development officer has an equal probability of being selected. Which of the following is the most appropriate sampling method?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 12

A basket contains 40 balls: 10 polka dotted; 7 plaid; 12 striped; 11 solids. The probability that a ball selected at random is striped is equal to which one of the following?

Accepted Answer

A)  7/40 
B)  10/40 
C)  11/40 
D)  12/40 
E)  Cannot be determined 
A)  7/40 
B)  10/40 
C)  11/40 
D)  12/40 
E)  Cannot be determined

Question 13

A researcher collects data from employers on their satisfaction with the college graduates that have hired. Surveys were sent to employers whose names were provided on the exit surveys completed by the college graduates. Which of the following sampling methods is implied by this scenario?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 14

A researcher wants their sampling method to be such that every 5th teacher in the population is selected. Which of the following is the most appropriate sampling method?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 15

A researcher is surveying guidance counselors on their perceptions about anti-bullying programs. The researcher wants their sampling method to be such that every counselor has an equal probability of being selected. Which of the following is the most appropriate sampling method?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 16

A researcher collects heart rate data on the first 100 newborn babies at the hospital. Which of the following sampling method is implied by this scenario?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 17

A researcher is surveying parents on their perceptions of the school at which their child attends. The researcher wants their sampling method to be such that every parent has an equal probability of being selected. Which of the following is the most appropriate sampling method?

Accepted Answer

A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling 
A)  convenient sampling 
B)  simple random sampling with replacement 
C)  simple random sampling without replacement 
D)  systematic sampling

Question 18

If a population distribution is approximately normal, then the distribution of the sample means for samples of size 100 will be which one of the following?

Accepted Answer

A)  highly negatively skewed 
B)  highly positively skewed 
C)  approximately normally distributed 
D)  cannot be determined without further information 
A)  highly negatively skewed 
B)  highly positively skewed 
C)  approximately normally distributed 
D)  cannot be determined without further information

Question 19

A bowl contains 20 balls: 6 red, 2 orange, 5 yellow, 3 blue, 4 green. The probability that a ball selected at random is orange is equal to which one of the following?

Accepted Answer

A)  2/15 
B)  3/15 
C)  4/15 
D)  5/15 
E)  Cannot be determined 
A)  2/15 
B)  3/15 
C)  4/15 
D)  5/15 
E)  Cannot be determined

Question 20

If a population distribution is highly negatively skewed, then the distribution of the sample means for samples of size 1000 will be which one of the following?

Accepted Answer

A)  highly negatively skewed 
B)  highly positively skewed 
C)  approximately normally distributed 
D)  cannot be determined without further information 
A)  highly negatively skewed 
B)  highly positively skewed 
C)  approximately normally distributed 
D)  cannot be determined without further information

Which of the following confidence intervals provides the greatest level of confidence?

A basket contains 25 balls: 5 polka dotted; 9 plaid; 3 striped; 8 solids. The probability that a ball selected at random is polka dotted is equal to which one of the following?

A random sample of size 50 had a mean of 5 and a standard deviation of 1. First calculate the standard error of the mean. Then calculate the 90% CI for the mean.

A researcher collects data from every other employee in the human resources database. Which of the following sampling methods is implied by this scenario?

A researcher wants their sampling method to be such that every 15^th person through the door is selected. Which of the following is the most appropriate sampling method?

If the standard error of the mean is 25 for n = 50, what must the sample size be to reduce the standard error to 20?

A researcher collects survey data from students who attend class on the day the survey is distributed. Which of the following sampling method is implied by this scenario?

A researcher wants their sampling method to be such that every 30^th person in the population is selected. Which of the following is the most appropriate sampling method?

A researcher is surveying speech-language pathologists (SLP) on their perceptions about communicative devices. The researcher wants their sampling method to be such that every SLP has an equal probability of being selected. Which of the following is the most appropriate sampling method?

Which of the following confidence intervals provides the lowest level of confidence?

A researcher is surveying university development officers regarding their satisfaction with alumni giving. The researcher wants their sampling method to be such that every development officer has an equal probability of being selected. Which of the following is the most appropriate sampling method?

A basket contains 40 balls: 10 polka dotted; 7 plaid; 12 striped; 11 solids. The probability that a ball selected at random is striped is equal to which one of the following?

A researcher collects data from employers on their satisfaction with the college graduates that have hired. Surveys were sent to employers whose names were provided on the exit surveys completed by the college graduates. Which of the following sampling methods is implied by this scenario?

A researcher wants their sampling method to be such that every 5^th teacher in the population is selected. Which of the following is the most appropriate sampling method?

A researcher is surveying guidance counselors on their perceptions about anti-bullying programs. The researcher wants their sampling method to be such that every counselor has an equal probability of being selected. Which of the following is the most appropriate sampling method?

A researcher collects heart rate data on the first 100 newborn babies at the hospital. Which of the following sampling method is implied by this scenario?

A researcher is surveying parents on their perceptions of the school at which their child attends. The researcher wants their sampling method to be such that every parent has an equal probability of being selected. Which of the following is the most appropriate sampling method?

If a population distribution is approximately normal, then the distribution of the sample means for samples of size 100 will be which one of the following?

A bowl contains 20 balls: 6 red, 2 orange, 5 yellow, 3 blue, 4 green. The probability that a ball selected at random is orange is equal to which one of the following?

If a population distribution is highly negatively skewed, then the distribution of the sample means for samples of size 1000 will be which one of the following?

Introduction

Data Representation

Univariate Population Parameters and Sample Statistics

Normal Distribution and Standard Scores

Inferences About a Single Mean

Inferences About the Difference Between Two Means

Inferences About Proportions

Inferences About Variances

Bivariate Measures of Association

One-Factor Anova: Fixed-Effects Model

Multiple Comparison Procedures

Factorial Anova: Fixed-Effects Model

One-Factor Fixed-Effects Ancova With Single Covariate

Random- and Mixed-Effects Analysis of Variance Models

Hierarchical and Randomized Block Analysis of Variance Models

Simple Linear Regression

Multiple Regression

Logistic Regression

Filters

Exam 5: Introduction to Probability and Sample Statistics

Which of the following confidence intervals provides the greatest level of confidence?

A basket contains 25 balls: 5 polka dotted; 9 plaid; 3 striped; 8 solids. The probability that a ball selected at random is polka dotted is equal to which one of the following?

A random sample of size 50 had a mean of 5 and a standard deviation of 1. First calculate the standard error of the mean. Then calculate the 90% CI for the mean.

A researcher collects data from every other employee in the human resources database. Which of the following sampling methods is implied by this scenario?

A researcher wants their sampling method to be such that every 15th person through the door is selected. Which of the following is the most appropriate sampling method?

If the standard error of the mean is 25 for n = 50, what must the sample size be to reduce the standard error to 20?

A researcher collects survey data from students who attend class on the day the survey is distributed. Which of the following sampling method is implied by this scenario?

A researcher wants their sampling method to be such that every 30th person in the population is selected. Which of the following is the most appropriate sampling method?

A researcher is surveying speech-language pathologists (SLP) on their perceptions about communicative devices. The researcher wants their sampling method to be such that every SLP has an equal probability of being selected. Which of the following is the most appropriate sampling method?

Which of the following confidence intervals provides the lowest level of confidence?

A researcher is surveying university development officers regarding their satisfaction with alumni giving. The researcher wants their sampling method to be such that every development officer has an equal probability of being selected. Which of the following is the most appropriate sampling method?

A basket contains 40 balls: 10 polka dotted; 7 plaid; 12 striped; 11 solids. The probability that a ball selected at random is striped is equal to which one of the following?

A researcher collects data from employers on their satisfaction with the college graduates that have hired. Surveys were sent to employers whose names were provided on the exit surveys completed by the college graduates. Which of the following sampling methods is implied by this scenario?

A researcher wants their sampling method to be such that every 5th teacher in the population is selected. Which of the following is the most appropriate sampling method?

A researcher is surveying guidance counselors on their perceptions about anti-bullying programs. The researcher wants their sampling method to be such that every counselor has an equal probability of being selected. Which of the following is the most appropriate sampling method?

A researcher collects heart rate data on the first 100 newborn babies at the hospital. Which of the following sampling method is implied by this scenario?

A researcher is surveying parents on their perceptions of the school at which their child attends. The researcher wants their sampling method to be such that every parent has an equal probability of being selected. Which of the following is the most appropriate sampling method?

If a population distribution is approximately normal, then the distribution of the sample means for samples of size 100 will be which one of the following?

A bowl contains 20 balls: 6 red, 2 orange, 5 yellow, 3 blue, 4 green. The probability that a ball selected at random is orange is equal to which one of the following?

If a population distribution is highly negatively skewed, then the distribution of the sample means for samples of size 1000 will be which one of the following?

Introduction

Data Representation

Univariate Population Parameters and Sample Statistics

Normal Distribution and Standard Scores

Inferences About a Single Mean

Inferences About the Difference Between Two Means

Inferences About Proportions

Inferences About Variances

Bivariate Measures of Association

One-Factor Anova: Fixed-Effects Model

Multiple Comparison Procedures

Factorial Anova: Fixed-Effects Model

One-Factor Fixed-Effects Ancova With Single Covariate

Random- and Mixed-Effects Analysis of Variance Models

Hierarchical and Randomized Block Analysis of Variance Models

Simple Linear Regression

Multiple Regression

Logistic Regression

Filters

A researcher wants their sampling method to be such that every 15^th person through the door is selected. Which of the following is the most appropriate sampling method?

A researcher wants their sampling method to be such that every 30^th person in the population is selected. Which of the following is the most appropriate sampling method?

A researcher wants their sampling method to be such that every 5^th teacher in the population is selected. Which of the following is the most appropriate sampling method?