Question 1

Which of the following sampling methods does not lead to probability samples?

Accepted Answer

A) stratified sampling 
B) cluster sampling 
C) systematic sampling 
D) convenience sampling 
A) stratified sampling 
B) cluster sampling 
C) systematic sampling 
D) convenience sampling

Question 2

Cluster sampling is

Accepted Answer

A) a nonprobability sampling method 
B) the same as convenience sampling 
C) a probability sampling method 
D) None of the alternative answers is correct. 
A) a nonprobability sampling method 
B) the same as convenience sampling 
C) a probability sampling method 
D) None of the alternative answers is correct.

Question 3

In point estimation, data from the

Accepted Answer

A) population is used to estimate the population parameter 
B) sample is used to estimate the population parameter 
C) sample is used to estimate the sample statistic 
D) None of the alternative ANSWERS is correct. 
A) population is used to estimate the population parameter 
B) sample is used to estimate the population parameter 
C) sample is used to estimate the sample statistic 
D) None of the alternative ANSWERS is correct.

Question 4

A sample of 66 observations will be taken from a process (an infinite population). The population proportion equals 0.12. The probability that the sample proportion will be less than 0.1768 is

Accepted Answer

A) 0.0568 
B) 0.0778 
C) 0.4222 
D) 0.9222 
A) 0.0568 
B) 0.0778 
C) 0.4222 
D) 0.9222

Question 5

A simple random sample of size n from a finite population of size N is to be selected. Each possible sample should have

Accepted Answer

A) the same probability of being selected 
B) a probability of 1/n of being selected 
C) a probability of 1/N of being selected 
D) a probability of N/n of being selected 
A) the same probability of being selected 
B) a probability of 1/n of being selected 
C) a probability of 1/N of being selected 
D) a probability of N/n of being selected

Question 6

The probability distribution of all possible values of the sample proportion   is the

Accepted Answer

A) probability density function of   
B) sampling distribution of   
C) same as  , since it considers all possible values of the sample proportion 
D) sampling distribution of   
A) probability density function of   
B) sampling distribution of   
C) same as  , since it considers all possible values of the sample proportion 
D) sampling distribution of

Question 7

A single numerical value used as an estimate of a population parameter is known as

Accepted Answer

A) a parameter 
B) a population parameter 
C) both a parameter or a population parameter are correct 
D) a point estimate 
A) a parameter 
B) a population parameter 
C) both a parameter or a population parameter are correct 
D) a point estimate

Question 8

Exhibit 7-1
The following data was collected from a simple random sample from a process (an infinite population).
  
-Refer to Exhibit 7-1. The point estimate of the population standard deviation is

Accepted Answer

A) 2.500 
B) 1.581 
C) 2.000 
D) 1.414 
A) 2.500 
B) 1.581 
C) 2.000 
D) 1.414

Question 9

A new soft drink is being market tested. It is estimated that 60% of consumers will like the new drink. A sample of 96 taste-tested the new drink.
a.Determine the standard error of the proportion
b.What is the probability that more than 70.4% of consumers will indicate they like the drink?
c.What is the probability that more than 30% of consumers will indicate they do not like the drink?

Accepted Answer

a.0.05
b.0

Question 10

For a population with an unknown distribution, the form of the sampling distribution of the sample mean is

Accepted Answer

A) approximately normal for all sample sizes 
B) exactly normal for large sample sizes 
C) exactly normal for all sample sizes 
D) approximately normal for large sample sizes 
A) approximately normal for all sample sizes 
B) exactly normal for large sample sizes 
C) exactly normal for all sample sizes 
D) approximately normal for large sample sizes

Question 11

Random samples of size 36 are taken from a process (an infinite population) whose mean and standard deviation are 20 and 15, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample mean are

Accepted Answer

A) 36 and 15 
B) 20 and 15 
C) 20 and 0.417 
D) 20 and 2.5 
A) 36 and 15 
B) 20 and 15 
C) 20 and 0.417 
D) 20 and 2.5

Question 12

Which of the following is(are) point estimator(s)?

Accepted Answer

A) F1F1F1S1F1F1F10 
B) F1F1F1S1F1F1F10 
C) s 
D) All of these answers are correct. 
A) F1F1F1S1F1F1F10 
B) F1F1F1S1F1F1F10 
C) s 
D) All of these answers are correct.

Question 13

The expected value of the random variable   is

Accepted Answer

A) F1F1F1S1F1F1F10 
B) the standard error 
C) the sample size 
D) F1F1F1S1F1F1F10 
A) F1F1F1S1F1F1F10 
B) the standard error 
C) the sample size 
D) F1F1F1S1F1F1F10

Question 14

Random samples of size 100 are taken from a process (an infinite population) whose population proportion is 0.2. The mean and standard deviation of the distribution of sample proportions are

Accepted Answer

A) 0.2 and .04 
B) 0.2 and 0.2 
C) 20 and .04 
D) None of the alternative answers is correct. 
A) 0.2 and .04 
B) 0.2 and 0.2 
C) 20 and .04 
D) None of the alternative answers is correct.

Question 15

The finite correction factor should be used in the computation of   when n/N is greater than

Accepted Answer

A) .01 
B) .025 
C) .05 
D) .10 
A) .01 
B) .025 
C) .05 
D) .10

Question 16

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 196. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are

Accepted Answer

A) 180 and 24.39 
B) 180 and 28 
C) 180 and 1.74 
D) 180 and 2 
A) 180 and 24.39 
B) 180 and 28 
C) 180 and 1.74 
D) 180 and 2

Question 17

Exhibit 7-4
A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces.
-Refer to Exhibit 7-4. The standard error of the mean equals

Accepted Answer

A) 0.3636 
B) 0.0331 
C) 0.0200 
D) 4.000 
A) 0.3636 
B) 0.0331 
C) 0.0200 
D) 4.000

Question 18

If we consider the simple random sampling process as an experiment, the sample mean is

Accepted Answer

A) always zero 
B) always smaller than the population mean 
C) a random variable 
D) exactly equal to the population mean 
A) always zero 
B) always smaller than the population mean 
C) a random variable 
D) exactly equal to the population mean

Question 19

The standard deviation of   is referred to as the

Accepted Answer

A) standard x 
B) standard error of the mean 
C) sample standard mean 
D) sample mean deviation 
A) standard x 
B) standard error of the mean 
C) sample standard mean 
D) sample mean deviation

Question 20

A sample of 25 observations is taken from a process (an infinite population). The sampling distribution of   is

Accepted Answer

A) not normal since n F1F1F1S1F1F1F10 30 
B) approximately normal because   is always normally distributed 
C) approximately normal if np F1F1F1S1F1F1F10 5 and n(1-p) F1F1F1S1F1F1F10 5 
D) approximately normal if np F1F1F1S1F1F1F10 30 and n(1-p) F1F1F1S1F1F1F10 30 
A) not normal since n F1F1F1S1F1F1F10 30 
B) approximately normal because   is always normally distributed 
C) approximately normal if np F1F1F1S1F1F1F10 5 and n(1-p) F1F1F1S1F1F1F10 5 
D) approximately normal if np F1F1F1S1F1F1F10 30 and n(1-p) F1F1F1S1F1F1F10 30

Which of the following sampling methods does not lead to probability samples?

Cluster sampling is

In point estimation, data from the

A sample of 66 observations will be taken from a process (an infinite population). The population proportion equals 0.12. The probability that the sample proportion will be less than 0.1768 is

A simple random sample of size n from a finite population of size N is to be selected. Each possible sample should have

The probability distribution of all possible values of the sample proportion is the

A single numerical value used as an estimate of a population parameter is known as

Exhibit 7-1 The following data was collected from a simple random sample from a process (an infinite population). -Refer to Exhibit 7-1. The point estimate of the population standard deviation is

For a population with an unknown distribution, the form of the sampling distribution of the sample mean is

Random samples of size 36 are taken from a process (an infinite population) whose mean and standard deviation are 20 and 15, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample mean are

Which of the following is(are) point estimator(s)?

The expected value of the random variable is

Random samples of size 100 are taken from a process (an infinite population) whose population proportion is 0.2. The mean and standard deviation of the distribution of sample proportions are

The finite correction factor should be used in the computation of when n/N is greater than

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 196. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are

Exhibit 7-4 A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. -Refer to Exhibit 7-4. The standard error of the mean equals

If we consider the simple random sampling process as an experiment, the sample mean is

The standard deviation of is referred to as the

A sample of 25 observations is taken from a process (an infinite population). The sampling distribution of is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design, and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Statistical Methods for Quality Control

Time Series Analysis and Forecastng

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Exam 7: Sampling and Sampling Distributions

Which of the following sampling methods does not lead to probability samples?

Cluster sampling is

In point estimation, data from the

A sample of 66 observations will be taken from a process (an infinite population). The population proportion equals 0.12. The probability that the sample proportion will be less than 0.1768 is

A simple random sample of size n from a finite population of size N is to be selected. Each possible sample should have

The probability distribution of all possible values of the sample proportion is the

A single numerical value used as an estimate of a population parameter is known as

Exhibit 7-1 The following data was collected from a simple random sample from a process (an infinite population). -Refer to Exhibit 7-1. The point estimate of the population standard deviation is

For a population with an unknown distribution, the form of the sampling distribution of the sample mean is

Random samples of size 36 are taken from a process (an infinite population) whose mean and standard deviation are 20 and 15, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample mean are

Which of the following is(are) point estimator(s)?

The expected value of the random variable is

Random samples of size 100 are taken from a process (an infinite population) whose population proportion is 0.2. The mean and standard deviation of the distribution of sample proportions are

The finite correction factor should be used in the computation of when n/N is greater than

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 196. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are

Exhibit 7-4 A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. -Refer to Exhibit 7-4. The standard error of the mean equals

If we consider the simple random sampling process as an experiment, the sample mean is

The standard deviation of is referred to as the

A sample of 25 observations is taken from a process (an infinite population). The sampling distribution of is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design, and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Statistical Methods for Quality Control

Time Series Analysis and Forecastng

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