Question 1

A random sample of size 1,000 is taken from a population where p = .20.Find P(   < .18).

Accepted Answer

A) .9429 
B) .0571 
C) .2643 
D) .0793 
A) .9429 
B) .0571 
C) .2643 
D) .0793

Question 2

A recording error is an error of observation.

Accepted Answer

A) True 
 B)False

Question 3

According to a hospital administrator,historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital.A scientific poll based on 400 hospital patients has just been conducted.What is the probability that fewer than 64 patients will not be satisfied with the after-surgery care?

Accepted Answer

A) 47.72% 
B) 2.28% 
C) 97.72% 
D) 95.44% 
E) 4.56% 
A) 47.72% 
B) 2.28% 
C) 97.72% 
D) 95.44% 
E) 4.56%

Question 4

The mean of the sampling distribution of   is always equal to the mean of the sampled population.

Accepted Answer

A) True 
 B)False

Question 5

If we wish to estimate a population parameter by using a sample statistic,we are using ___________.

Accepted Answer

A) Cluster sampling 
B) Point estimation 
C) Random sampling 
D) Response bias 
A) Cluster sampling 
B) Point estimation 
C) Random sampling 
D) Response bias

Question 6

If we have a sample size of 100 and the estimate of the population proportion is .10,what is the standard deviation of the sampling distribution of the sample proportion?

Accepted Answer

A) .0009 
B) .03 
C) 3 
D) .01 
E) .10 
A) .0009 
B) .03 
C) 3 
D) .01 
E) .10

Question 7

Which of the following is a type of question used in survey research?

Accepted Answer

A) Dichotomous 
B) Free response 
C) Rating 
D) All of these 
A) Dichotomous 
B) Free response 
C) Rating 
D) All of these

Question 8

In a manufacturing process,a machine produces bolts that have an average length of 3 inches with a variance of .03.If we randomly select three bolts from this process,what is the standard deviation of the sampling distribution of the sample mean?

Accepted Answer

A) .03 
B) .01 
C) .1732 
D) .0577 
E) .10 
A) .03 
B) .01 
C) .1732 
D) .0577 
E) .10

Question 9

It has been reported that the average time to download the home page from a government website was 0.9 seconds.Suppose that the download times were normally distributed with a standard deviation of 0.3 seconds.If random samples of 36 download times are selected,calculate the mean of the sampling distribution of the sampling mean.

Accepted Answer

A) 0.3 
B) 0.15 
C) 0.9 
D) 0.05 
A) 0.3 
B) 0.15 
C) 0.9 
D) 0.05

Question 10

A random sample of size 1,000 is taken from a population where p = .20.Find P(   < .22).

Accepted Answer

A) .2643 
B) .9429 
C) .9207 
D) .0571 
A) .2643 
B) .9429 
C) .9207 
D) .0571

Question 11

The target population is the result of sampling from the original population that is of interest to the researcher.

Accepted Answer

A) True 
 B)False

Question 12

If the sampled population distribution is skewed,then in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size n is at least 30.

Accepted Answer

A) True 
 B)False

Question 13

The ______________ of a sample statistic is the probability distribution of the population of all possible values of the sample statistic.

Accepted Answer

A) Sample mean 
B) Sampling Distribution of Sample Mean 
C) Probability 
D) Observations 
A) Sample mean 
B) Sampling Distribution of Sample Mean 
C) Probability 
D) Observations

Question 14

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.Find P(   > 49).

Accepted Answer

A) .8331 
B) .1151 
C) .8849 
D) .1389 
A) .8331 
B) .1151 
C) .8849 
D) .1389

Question 15

The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.3 inches.What is the probability that the average length of a steel sheet from a sample of 9 units is more than 29.95 inches long?

Accepted Answer

A) .4602 
B) .8413 
C) .1587 
D) .5397 
A) .4602 
B) .8413 
C) .1587 
D) .5397

Question 16

The internal auditing staff of a local manufacturing company performs a sample audit each quarter to estimate the proportion of accounts that are more than 90 days overdue (delinquent).The historical records of the company show that over the past 8 years,the average has been that 13 percent of the accounts have been delinquent.For this quarter,the auditing staff randomly selected 250 customer accounts.What is the probability that no more than 40 accounts will be classified as delinquent?

Accepted Answer

A) 42.07% 
B) 92.07% 
C) 7.93% 
D) 40.15% 
E) 90.15% 
A) 42.07% 
B) 92.07% 
C) 7.93% 
D) 40.15% 
E) 90.15%

Question 17

According to a hospital administrator,historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital.A scientific poll based on 400 hospital patients has just been conducted.Sixty-four patients indicated that they were dissatisfied with the after-surgery care.What are the mean and the standard deviation of the sampling distribution of   ?

Accepted Answer

A) 16% and .034% 
B) 20% and 1.83% 
C) 20% and 2% 
D) 20% and .034% 
E) 20% and 16% 
A) 16% and .034% 
B) 20% and 1.83% 
C) 20% and 2% 
D) 20% and .034% 
E) 20% and 16%

Question 18

A minimum variance,unbiased point estimate has a variance that is as small as or smaller than the variances of any other unbiased point estimate.

Accepted Answer

A) True 
 B)False

Question 19

As the sample size increases,the variability of the sampling distribution of the mean ______________.

Accepted Answer

A) Increases 
B) Stays the same 
C) Is variable 
D) Decreases 
A) Increases 
B) Stays the same 
C) Is variable 
D) Decreases

Question 20

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.What is

Accepted Answer

A) .1389 
B) 5 
C) 8.33 
D) 0.833 
A) .1389 
B) 5 
C) 8.33 
D) 0.833

A random sample of size 1,000 is taken from a population where p = .20.Find P( < .18).

A recording error is an error of observation.

The mean of the sampling distribution of is always equal to the mean of the sampled population.

If we wish to estimate a population parameter by using a sample statistic,we are using ___________.

If we have a sample size of 100 and the estimate of the population proportion is .10,what is the standard deviation of the sampling distribution of the sample proportion?

Which of the following is a type of question used in survey research?

In a manufacturing process,a machine produces bolts that have an average length of 3 inches with a variance of .03.If we randomly select three bolts from this process,what is the standard deviation of the sampling distribution of the sample mean?

A random sample of size 1,000 is taken from a population where p = .20.Find P( < .22).

The target population is the result of sampling from the original population that is of interest to the researcher.

If the sampled population distribution is skewed,then in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size n is at least 30.

The ______________ of a sample statistic is the probability distribution of the population of all possible values of the sample statistic.

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.Find P( > 49).

The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.3 inches.What is the probability that the average length of a steel sheet from a sample of 9 units is more than 29.95 inches long?

A minimum variance,unbiased point estimate has a variance that is as small as or smaller than the variances of any other unbiased point estimate.

As the sample size increases,the variability of the sampling distribution of the mean ______________.

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.What is

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Process Improvement Using Control Charts

Filters

Exam 7: Sampling and Sampling Distributions

A random sample of size 1,000 is taken from a population where p = .20.Find P( < .18).

A recording error is an error of observation.

The mean of the sampling distribution of is always equal to the mean of the sampled population.

If we wish to estimate a population parameter by using a sample statistic,we are using ___________.

If we have a sample size of 100 and the estimate of the population proportion is .10,what is the standard deviation of the sampling distribution of the sample proportion?

Which of the following is a type of question used in survey research?

In a manufacturing process,a machine produces bolts that have an average length of 3 inches with a variance of .03.If we randomly select three bolts from this process,what is the standard deviation of the sampling distribution of the sample mean?

A random sample of size 1,000 is taken from a population where p = .20.Find P( < .22).

The target population is the result of sampling from the original population that is of interest to the researcher.

If the sampled population distribution is skewed,then in most cases the sampling distribution of the mean can be approximated by the normal distribution if the sample size n is at least 30.

The ______________ of a sample statistic is the probability distribution of the population of all possible values of the sample statistic.

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.Find P( > 49).

The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.3 inches.What is the probability that the average length of a steel sheet from a sample of 9 units is more than 29.95 inches long?

A minimum variance,unbiased point estimate has a variance that is as small as or smaller than the variances of any other unbiased point estimate.

As the sample size increases,the variability of the sampling distribution of the mean ______________.

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5.What is

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Descriptive Statistics: Numerical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Confidence Intervals

Hypothesis Testing

Statistical Inferences Based on Two Samples

Experimental Design and Analysis of Variance

Chi-Square Tests

Simple Linear Regression Analysis

Multiple Regression and Model Building

Process Improvement Using Control Charts

Filters