Question 1

Which of the following is NOT a reason for the need for sampling?

Accepted Answer

A)  It is usually too costly to study the whole population. 
B)  It is usually too time consuming to look at the whole population. 
C)  It is sometimes destructive to observe the entire population. 
D)  It is always more informative by investigating a sample than the entire population. 
A)  It is usually too costly to study the whole population. 
B)  It is usually too time consuming to look at the whole population. 
C)  It is sometimes destructive to observe the entire population. 
D)  It is always more informative by investigating a sample than the entire population.

Question 2

Suppose the ages of students in Statistics 101 follow a skewed-right distribution with a mean of 23 years and a standard deviation of 3 years. If we randomly sampled 100 students, which of the following statements about the sampling distribution of the sample mean age is incorrect?

Accepted Answer

A)  The mean of the sampling distribution is equal to 23 years. 
B)  The standard deviation of the sampling distribution is equal to 3 years. 
C)  The shape of the sampling distribution is approximately normal. 
D)  The standard error of the sampling distribution is equal to 0.3 years. 
A)  The mean of the sampling distribution is equal to 23 years. 
B)  The standard deviation of the sampling distribution is equal to 3 years. 
C)  The shape of the sampling distribution is approximately normal. 
D)  The standard error of the sampling distribution is equal to 0.3 years.

Question 3

A study at a college in the west coast reveals that, historically, 45% of their students are minority students. If random samples of size 75 are selected, 95% of the samples will have more than ________% of minority students.

Accepted Answer

The answer of A study at a college in the...

Question 4

Which of the following sampling methods is a probability sample?

Accepted Answer

A)  Convenience sample 
B)  Quota sample 
C)  Stratified sample 
D)  Judgment sample 
A)  Convenience sample 
B)  Quota sample 
C)  Stratified sample 
D)  Judgment sample

Question 5

A population frame for a survey contains a listing of 6,179 names. Using a table of random numbers, which of the following code numbers will appear on your list?

Accepted Answer

A)  06 
B)  0694 
C)  6946 
D)  61790 
A)  06 
B)  0694 
C)  6946 
D)  61790

Question 6

If the amount of gasoline purchased per car at a large service station has a population mean of $15 and a population standard deviation of $4 and it is assumed that the amount of gasoline purchased per car is symmetric, there is approximately a 68.26% chance that a random sample of 16 cars will have a sample mean between $14 and $16.

Accepted Answer

A) True 
 B)False

Question 7

For sample sizes greater than 30, the sampling distribution of the mean will be approximately normally distributed

Accepted Answer

A)  regardless of the shape of the population. 
B)  only if the shape of the population is symmetrical. 
C)  only if the standard deviation of the samples are known. 
D)  only if the population is normally distributed. 
A)  regardless of the shape of the population. 
B)  only if the shape of the population is symmetrical. 
C)  only if the standard deviation of the samples are known. 
D)  only if the population is normally distributed.

Which of the following is NOT a reason for the need for sampling?

Suppose the ages of students in Statistics 101 follow a skewed-right distribution with a mean of 23 years and a standard deviation of 3 years. If we randomly sampled 100 students, which of the following statements about the sampling distribution of the sample mean age is incorrect?

A study at a college in the west coast reveals that, historically, 45% of their students are minority students. If random samples of size 75 are selected, 95% of the samples will have more than ________% of minority students.

Which of the following sampling methods is a probability sample?

A population frame for a survey contains a listing of 6,179 names. Using a table of random numbers, which of the following code numbers will appear on your list?

For sample sizes greater than 30, the sampling distribution of the mean will be approximately normally distributed

Instruction and Data Collection

Presenting Data in Tables and Charts

Numerical Descriptive Measures

Basic Probability

Some Important Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests

Analysis of Variance

Chi-Square Tests and Nonparametric Tests

Simple Linear Regression

Introduction to Multiple Regression

Multiple Regression Model Building

Time-Series Analysis and Index Numbers

Statistical Applications in Quality Management

Data Analysis Overview

Filters

Exam 7: Sampling and Sampling Distributions

Which of the following is NOT a reason for the need for sampling?

Suppose the ages of students in Statistics 101 follow a skewed-right distribution with a mean of 23 years and a standard deviation of 3 years. If we randomly sampled 100 students, which of the following statements about the sampling distribution of the sample mean age is incorrect?

A study at a college in the west coast reveals that, historically, 45% of their students are minority students. If random samples of size 75 are selected, 95% of the samples will have more than ________% of minority students.

Which of the following sampling methods is a probability sample?

A population frame for a survey contains a listing of 6,179 names. Using a table of random numbers, which of the following code numbers will appear on your list?

For sample sizes greater than 30, the sampling distribution of the mean will be approximately normally distributed

Instruction and Data Collection

Presenting Data in Tables and Charts

Numerical Descriptive Measures

Basic Probability

Some Important Discrete Probability Distributions

The Normal Distribution and Other Continuous Distributions

Confidence Interval Estimation

Fundamentals of Hypothesis Testing: One-Sample Tests

Two-Sample Tests

Analysis of Variance

Chi-Square Tests and Nonparametric Tests

Simple Linear Regression

Introduction to Multiple Regression

Multiple Regression Model Building

Time-Series Analysis and Index Numbers

Statistical Applications in Quality Management

Data Analysis Overview

Filters