Question 1

The following data was collected from a simple random sample of a population. 13 15 14 16 12
The point estimate of the population mean

Accepted Answer

A) cannot be determined, since the population size is unknown 
B) is 14 
C) is 4 
D) is 5 
A) cannot be determined, since the population size is unknown 
B) is 14 
C) is 4 
D) is 5

Question 2

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

Accepted Answer

A) the probability density function of   
B) the sampling distribution of   
C) the grand mean, since it considers all possible values of the sample mean 
D) one, since it considers all possible values of the sample mean 
A) the probability density function of   
B) the sampling distribution of   
C) the grand mean, since it considers all possible values of the sample mean 
D) one, since it considers all possible values of the sample mean

Question 3

The sampling distribution of the sample means

Accepted Answer

A) is the probability distribution showing all possible values of the sample mean 
B) is used as a point estimator of the population mean $\mu$ 
C) is an unbiased estimator 
D) shows the distribution of all possible values of $\mu$ 
A) is the probability distribution showing all possible values of the sample mean 
B) is used as a point estimator of the population mean $\mu$ 
C) is an unbiased estimator 
D) shows the distribution of all possible values of $\mu$

Question 4

A department store has determined that 25% of all their sales are credit sales. A random sample of 60 sales is selected.
a.What is the sampling distribution of   ? 
b.What is the probability that the sample proportion will be greater than 0.30?
c.What is the probability that the sample proportion will be between 0.20 to 0.30?

Accepted Answer

a.E( @#IMG-DLM& ) = 0.25 Stand

Question 5

Stratified random sampling is a method of selecting a sample in which

Accepted Answer

A) the sample is first divided into strata, and then random samples are taken from each stratum 
B) various strata are selected from the sample 
C) the population is first divided into strata, and then random samples are drawn from each stratum 
D) None of these alternatives is correct. 
A) the sample is first divided into strata, and then random samples are taken from each stratum 
B) various strata are selected from the sample 
C) the population is first divided into strata, and then random samples are drawn from each stratum 
D) None of these alternatives is correct.

Question 6

How many different samples of size 3 can be taken from a finite population of size 10?

Accepted Answer

A) 30 
B) 1,000 
C) 720 
D) 120 
A) 30 
B) 1,000 
C) 720 
D) 120

Question 7

A simple random sample of 6 recent graduates revealed the following information about their weekly incomes.   
a.What is the expected value of the average weekly income of all the recent graduates?
b.What is the expected value of the standard deviation for the population?

Accepted Answer

The answer of A simple random sample of 6 recent...

Question 8

The sampling error is the

Accepted Answer

A) same as the standard error of the mean 
B) difference between the value of the sample mean and the value of the population mean 
C) error caused by selecting a bad sample 
D) standard deviation multiplied by the sample size 
A) same as the standard error of the mean 
B) difference between the value of the sample mean and the value of the population mean 
C) error caused by selecting a bad sample 
D) standard deviation multiplied by the sample size

Question 9

A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. The standard error of the mean is

Accepted Answer

A) 1.20 
B) 0.12 
C) 8.00 
D) 0.80 
A) 1.20 
B) 0.12 
C) 8.00 
D) 0.80

Question 10

The sample statistic, such as   , s, or   , that provides the point estimate of the population parameter is known as

Accepted Answer

A) a point estimator 
B) a parameter 
C) a population parameter 
D) a population statistic 
A) a point estimator 
B) a parameter 
C) a population parameter 
D) a population statistic

Question 11

In computing the standard error of the mean, the finite population correction factor is used when

Accepted Answer

A) N/n > 0.05 
B) N/n   0.05 
C) n/N > 0.05 
D) n/N   30 
A) N/n > 0.05 
B) N/n   0.05 
C) n/N > 0.05 
D) n/N   30

Question 12

Exhibit 7-2
A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores.  
-Refer to Exhibit 7-2. The point estimate for the proportion of all students who passed the course is

Accepted Answer

A) 0.8 
B) 0.2 
C) 1.8 
D) 1.2 
A) 0.8 
B) 0.2 
C) 1.8 
D) 1.2

Question 13

A subset of a population selected to represent the population is

Accepted Answer

A) a subset 
B) a sample 
C) a small population 
D) a parameter 
A) a subset 
B) a sample 
C) a small population 
D) a parameter

Question 14

Exhibit 7-1
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 7-1. The point estimate of the mean content of the bottles is

Accepted Answer

A) 0.22 
B) 4 
C) 121 
D) 0.02 
A) 0.22 
B) 4 
C) 121 
D) 0.02

Question 15

A sample of 24 observations is taken from a population that has 150 elements. The sampling distribution of   is

Accepted Answer

A) approximately normal because   is always approximately normally distributed 
B) approximately normal because the sample size is large in comparison to the population size 
C) approximately normal because of the central limit theorem 
D) normal if the population is normally distributed 
A) approximately normal because   is always approximately normally distributed 
B) approximately normal because the sample size is large in comparison to the population size 
C) approximately normal because of the central limit theorem 
D) normal if the population is normally distributed

Question 16

The expected value of the random variable   is

Accepted Answer

A) the standard error 
B) the sample size 
C) the size of the population 
D) None of these alternatives is correct. 
A) the standard error 
B) the sample size 
C) the size of the population 
D) None of these alternatives is correct.

Question 17

Random samples of size 17 are taken from a population that has 200 elements, a mean of 36, and a standard deviation of 8. The mean and the standard deviation of the sampling distribution of the sample means are

Accepted Answer

A) 8.7 and 1.94 
B) 36 and 1.94 
C) 36 and 1.86 
D) 36 and 8 
A) 8.7 and 1.94 
B) 36 and 1.94 
C) 36 and 1.86 
D) 36 and 8

Question 18

The average weekly earnings of bus drivers in a city are $950 (that is $\mu$) with a standard deviation of $45 (that is $\sigma$). Assume that we select a random sample of 81 bus drivers.
a.Compute the standard error of the mean.
b.What is the probability that the sample mean will be greater than $960?
c.If the population of bus drivers consisted of 400 drivers, what would be the standard error of the mean?

Accepted Answer

The answer of The average weekly earnings of bus drivers...

Question 19

Random samples of size 36 are taken from 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 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 20

A random sample of 15 telephone calls in an office showed the duration of each call and whether it was a local or a long distance call.   
a.What is the point estimate for the average duration of all calls?
b.What is the point estimate for the standard deviation of the population?
c.What is the point estimate for the proportion of all calls that were long distance?

Accepted Answer

a.5.67
b.2

The following data was collected from a simple random sample of a population. 13 15 14 16 12 The point estimate of the population mean

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

The sampling distribution of the sample means

Stratified random sampling is a method of selecting a sample in which

How many different samples of size 3 can be taken from a finite population of size 10?

A simple random sample of 6 recent graduates revealed the following information about their weekly incomes. a.What is the expected value of the average weekly income of all the recent graduates? b.What is the expected value of the standard deviation for the population?

The sampling error is the

A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. The standard error of the mean is

The sample statistic, such as , s, or , that provides the point estimate of the population parameter is known as

In computing the standard error of the mean, the finite population correction factor is used when

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the proportion of all students who passed the course is

A subset of a population selected to represent the population is

Exhibit 7-1 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 7-1. The point estimate of the mean content of the bottles is

A sample of 24 observations is taken from a population that has 150 elements. The sampling distribution of is

The expected value of the random variable is

Random samples of size 17 are taken from a population that has 200 elements, a mean of 36, and a standard deviation of 8. The mean and the standard deviation of the sampling distribution of the sample means are

Random samples of size 36 are taken from 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 mean are

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

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Exam 7: Sampling and Sampling Distributions

The following data was collected from a simple random sample of a population. 13 15 14 16 12 The point estimate of the population mean

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

The sampling distribution of the sample means

Stratified random sampling is a method of selecting a sample in which

How many different samples of size 3 can be taken from a finite population of size 10?

A simple random sample of 6 recent graduates revealed the following information about their weekly incomes. a.What is the expected value of the average weekly income of all the recent graduates? b.What is the expected value of the standard deviation for the population?

The sampling error is the

A simple random sample of 100 observations was taken from a large population. The sample mean and the standard deviation were determined to be 80 and 12 respectively. The standard error of the mean is

The sample statistic, such as , s, or , that provides the point estimate of the population parameter is known as

In computing the standard error of the mean, the finite population correction factor is used when

Exhibit 7-2 A random sample of 10 examination papers in a course, which was given on a pass or fail basis, showed the following scores. -Refer to Exhibit 7-2. The point estimate for the proportion of all students who passed the course is

A subset of a population selected to represent the population is

Exhibit 7-1 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 7-1. The point estimate of the mean content of the bottles is

A sample of 24 observations is taken from a population that has 150 elements. The sampling distribution of is

The expected value of the random variable is

Random samples of size 17 are taken from a population that has 200 elements, a mean of 36, and a standard deviation of 8. The mean and the standard deviation of the sampling distribution of the sample means are

Random samples of size 36 are taken from 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 mean are

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Descriptive Statistics: Numerical Measures

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Index Numbers

Decision Analysis on Website

Sample Survey on Website

Filters