Question 1

a point such that the probability of getting any other

Accepted Answer

point further from the mean is less than 0.025.

Question 2

A college dean wants to determine the average time it takes a student to get from one class to the next.Preliminary studies have shown that it is reasonable to let  t = 1.5 minutes the standard deviation of class travel times).What is the sample size which should be examined if the dean wants to assert with a probability of 95 percent that his estimate, the mean time of the random sample, will not be "off" by more than .25 minutes in either direction)? Choose the closest answer.

Accepted Answer

A) 72 or more, but not less 
B) 81 or more, but not less 
C) 139 or more, but not less 
D) 200 or more, but not less 
E) None of the above 
A) 72 or more, but not less 
B) 81 or more, but not less 
C) 139 or more, but not less 
D) 200 or more, but not less 
E) None of the above C

Question 3

A 95 percent confidence interval will be smaller than a 90 percent confidence interval.

Accepted Answer

A) True 
 B)False  False

Question 4

Two samples are drawn from the same population with a known variance,  2.If the sample sizes are 100 and 400, then the standard error of the mean of the former sample will be half that of the latter.

Accepted Answer

A) True 
 B)False

Question 5

As the sample size becomes larger, the mean of the sampling distribution becomes 
a) greater than the population mean 
b) smaller than the population mean 
c) equal to the population mean 
d) double that of the population mean

Accepted Answer

The answer of As the sample size becomes larger, the...

Question 6

The size of a sample can be determined only by using statistical techniques.

Accepted Answer

A) True 
 B)False

Question 7

It is estimated that the proportion of Californians in favor of Proposition 5 is between 0.4 and 0.6.The sponsors of the proposition would like to sample Californians and get a 95 percent confidence interval for the true proportion of people in favor of Proposition 5.They want to restrict the error level to 5 percentage points.The required sample size is then

Accepted Answer

A) 400. 
B) 40. 
C) 100. 
D) 1,000. 
E) none of the above. 
A) 400. 
B) 40. 
C) 100. 
D) 1,000. 
E) none of the above.

Question 8

a 95 percent confidence interval indicates the range
a.1
b.2
c.3
d.4
e.1 and 2

Accepted Answer

within whi

Question 9

The standard error of the sample mean is

Accepted Answer

A) 0.5 
B) 0.5 divided by 16 
C) 0.25 divided by 16 
D) 0.5 divided by 4 
E) 0.25 
A) 0.5 
B) 0.5 divided by 16 
C) 0.25 divided by 16 
D) 0.5 divided by 4 
E) 0.25

Question 10

The sample variance, S2, can be used to estimate the population variation.

Accepted Answer

A) True 
 B)False

Question 11

a 90 percent confidence interval will be 9.36 and 10.64,

Accepted Answer

The answer of a 90 percent confidence interval will be...

Question 12

Consider the following data: _ X = 10  = 4 n = 25 The lower and upper limits of

Accepted Answer

The answer of Consider the following data: _ X =...

Question 13

If two random samples of equal size are drawn from the same population, we should expect the mean of both samples to be identical.

Accepted Answer

A) True 
 B)False

Question 14

It does not make sense to use disproportionate sampling if one of the subgroups of the population is a relatively small percentage of the population

Accepted Answer

A) True 
 B)False

Question 15

If the allowed error is increased, the required sample size would decrease.

Accepted Answer

A) True 
 B)False

Question 16

ABC Incorporated wants to find out the proportion of customers who would purchase their new product.They have decided to take a modest sample, look at the results, and then decide if more information, in the form of a larger sample, is needed.ABC is using

Accepted Answer

A) simple random sampling. 
B) biased random sampling. 
C) stratified sampling. 
D) sequential sampling. 
E) none of the above.
Use the following information for questions 15 through 17
A soap factory produces 500-pound boxes of soap for industries.However, the weight of the boxes varies somewhat due to the process.Assume that the weight of each box is distributed normally with
Mean = = 500 pounds variance = 2 = 25 pounds2
Quality control takes a random sample of 25 boxes per day.Let the weight of these boxes be denoted as X1, X2, ..., X25. 
A) simple random sampling. 
B) biased random sampling. 
C) stratified sampling. 
D) sequential sampling. 
E) none of the above.
Use the following information for questions 15 through 17
A soap factory produces 500-pound boxes of soap for industries.However, the weight of the boxes varies somewhat due to the process.Assume that the weight of each box is distributed normally with
Mean = = 500 pounds variance = 2 = 25 pounds2
Quality control takes a random sample of 25 boxes per day.Let the weight of these boxes be denoted as X1, X2, ..., X25.

Question 17

The probability that X8 is between 495 and 505 pounds is closest to

Accepted Answer

A) .0228 
B) .3174 
C) .9772 
D) .6826 
E) .3830 
A) .0228 
B) .3174 
C) .9772 
D) .6826 
E) .3830

Question 18

a point such that the probability of getting any other

Accepted Answer

point further from t

Question 19

Which of the following factors does the interval estimate depends on? sample size?
a) sample size 
b) confidence level 
c) population standard deviation 
d) all of the above

Accepted Answer

The answer of Which of the following factors does the...

Question 20

The probability that the sample mean lies between 498 and 502 is closest to

Accepted Answer

A) .3174 
B) .9772 
C) .9544 
D) .3108 
E) .6826 
A) .3174 
B) .9772 
C) .9544 
D) .3108 
E) .6826

Exam 15: Sample Size and Statistical Theory

a point such that the probability of getting any other

A 95 percent confidence interval will be smaller than a 90 percent confidence interval.

Two samples are drawn from the same population with a known variance, 2.If the sample sizes are 100 and 400, then the standard error of the mean of the former sample will be half that of the latter.

As the sample size becomes larger, the mean of the sampling distribution becomes a) greater than the population mean b) smaller than the population mean c) equal to the population mean d) double that of the population mean

The size of a sample can be determined only by using statistical techniques.

a 95 percent confidence interval indicates the range a.1 b.2 c.3 d.4 e.1 and 2

The standard error of the sample mean is

The sample variance, S2, can be used to estimate the population variation.

a 90 percent confidence interval will be 9.36 and 10.64,

Consider the following data: _ X = 10 = 4 n = 25 The lower and upper limits of

If two random samples of equal size are drawn from the same population, we should expect the mean of both samples to be identical.

It does not make sense to use disproportionate sampling if one of the subgroups of the population is a relatively small percentage of the population

If the allowed error is increased, the required sample size would decrease.

ABC Incorporated wants to find out the proportion of customers who would purchase their new product.They have decided to take a modest sample, look at the results, and then decide if more information, in the form of a larger sample, is needed.ABC is using

The probability that X8 is between 495 and 505 pounds is closest to

a point such that the probability of getting any other

Which of the following factors does the interval estimate depends on? sample size? a) sample size b) confidence level c) population standard deviation d) all of the above

The probability that the sample mean lies between 498 and 502 is closest to

A Decision Making Perspective on Marketing Intelligence

Marketing Research in Practice

The Marketing Research Process

Research Design and Implementation

Secondary Sources of Marketing Data

Standardized Sources of Marketing Data

Marketing Research on the Internet

Information Collection: Qualitative and Observational Methods

Information From Respondents: Issues in Data Collection

Information From Respondents: Survey Methods

Attitude Measurement

Designing the Questionnaire

Experimentation

Sampling Fundamentals

Fundamentals of Data Analysis

Hypothesis Testing: Basic Concepts and Tests of Association

Hypothesis Testing: Means and Proportions

Correlation Analysis and Regression Analysis

Discriminant, Factor and Cluster Analysis

Multidimensional Scaling and Conjoint Analysis

Presenting the Results

Marketing-Mix Measures

Brand and Customer Metrics

New Age Strategies

Filters

Two samples are drawn from the same population with a known variance, ².If the sample sizes are 100 and 400, then the standard error of the mean of the former sample will be half that of the latter.

The sample variance, S², can be used to estimate the population variation.

The probability that X₈ is between 495 and 505 pounds is closest to