Question 1

The relationship between the alpha level and the confidence level is such that

Accepted Answer

A)   the lower the alpha, the higher the confidence level
B)   the lower the alpha, the lower the confidence level
C)   they are not related until the confidence level reaches .95
D)   none of these, since they are not related at all

Question 2

A random sample of 10 adult subjects was selected and tested on the Vocabulary sub-test of the Wechsler Adult Intelligence Scale (WAIS). Their scores were as follows: 12, 11, 10, 10, 10, 7, 6, 6, 5, 5. Test whether this sample could be representative of a population whose mean is known to be 10.00.

Accepted Answer

t=-2.140 F...

Question 3

For the following set of sample scores, find the estimated standard error of the mean: 20, 14, 16, 18, 9, 16, 18, 16, 15, 14.

Accepted Answer

The answer of For the following set of sample scores,...

Question 4

With infinite degrees of freedom, the t distribution approaches normality.

Accepted Answer

A) True 
 B)False

Question 5

In order to calculate the estimated standard error of the mean, one need only know

Accepted Answer

A)   the sample's standard deviation and the size of the sample
B)   the sample mean
C)   the parameter mean
D)   the standard deviation of the distribution of individual scores

Question 6

The fact that the point estimate of the population mean may be inaccurate (even with random sampling)  is due largely to

Accepted Answer

A)   bias
B)   alpha error
C)   sampling error
D)   none of these, since the population mean cannot be estimated

Question 7

For the following set of sample scores, find the estimated standard error of the mean: 23, 20, 21, 24, 18, 22, 24, 22, 20, 20.

Accepted Answer

The answer of For the following set of sample scores,...

Question 8

Other things being equal, the smaller the value of the estimated standard error of the mean, the narrower the confidence interval becomes.

Accepted Answer

A) True 
 B)False

Question 9

The term "confidence" expresses the probability that one's estimate is

Accepted Answer

A)   accurate
B)   not accurate
C)   inferred from a population
D)   based on a sample mean

Question 10

The estimated standard error of the mean is

Accepted Answer

A)   an estimate of the sampling error
B)   a parameter
C)   a statistic
D)   equal to the range of individual scores, divided by 6

Question 11

The estimated standard error of the mean is equal to

Accepted Answer

A)   the standard deviation of the sample
B)   the standard deviation of the sample, divided by the square-root of the size of the sample, less one
C)   the standard deviation of the population multiplied by the size of the population
D)   the difference between the mean of the sample and the mean of the

Question 12

A confidence interval of .99 predicts a narrower range of mean values than does an interval of .

Accepted Answer

A) True 
 B)False

Question 13

Increasing the confidence-interval level from .95 to .

Accepted Answer

A)   increases the likelihood of including the population mean within its limits
B)   decreases the likelihood of including the population mean within its limits
C)   increases the number of degrees of freedom
D)   none of these, since a confidence interval may never include the true population mean

Question 14

With a sample size of 30, the single-sample t ratio has 1 degree of freedom.

Accepted Answer

A) True 
 B)False

Question 15

The average sentence (in months) for homicide is 227 (Gaines & Miller, 2003). A sample of inmates from a certain prison, all of whom having been convicted of homicide, was selected and their sentences calculated. The sentences follow: 200, 225, 197. 256, 300, 158, 220, 226, 230, 215, 237, 223, and 243.
-Find the single sample t ratio.

Accepted Answer

The answer of The average sentence (in months) for homicide...

Question 16

For the t ratio, other things being equal, having 1 degree of freedom rather than 12 degrees of freedom makes it

Accepted Answer

A)   more likely to reject Ho
B)   less likely to reject Ho
C)   impossible to reject Ho
D)   none of these

Question 17

The true standard deviation of the sample may be used directly to estimate the point value of the population mean.

Accepted Answer

A) True 
 B)False

Question 18

When a given difference is determined to be "significant", then

Accepted Answer

A)   the alpha level must have failed
B)   the alpha level must have been rejected
C)   the null hypothesis must have been rejected
D)   there was a failure to reject the null hypothesis

Question 19

Other things being equal, the fewer the degrees of freedom, the easier it is to obtain a significant t ratio.

Accepted Answer

A) True 
 B)False

Question 20

With very small sample sizes, the estimated standard deviation of the population yields a slightly higher value than does the true standard deviation of the sample.

Accepted Answer

A) True 
 B)False

Exam 8: Parameter Estimates

The true standard deviation of the sample may be used directly to estimate the point value of the population mean.

Correct Answer
verified

A confidence interval of .99 predicts a narrower range of mean values than does an interval of .

Correct Answer
verified

With very small sample sizes, the estimated standard deviation of the population yields a slightly higher value than does the true standard deviation of the sample.

Correct Answer
verified

The term "confidence" expresses the probability that one's estimate is

Correct Answer
verified

For the following set of sample scores, find the estimated standard error of the mean: 20, 14, 16, 18, 9, 16, 18, 16, 15, 14.

Correct Answer
verified

In order to calculate the estimated standard error of the mean, one need only know

Correct Answer
verified

When a given difference is determined to be "significant", then

Correct Answer
verified

With a sample size of 30, the single-sample t ratio has 1 degree of freedom.

Correct Answer
verified

The estimated standard error of the mean is equal to

Correct Answer
verified

With infinite degrees of freedom, the t distribution approaches normality.

Correct Answer
verified

Correct Answer
verified

The estimated standard error of the mean is

Correct Answer
verified

A random sample of 10 adult subjects was selected and tested on the Vocabulary sub-test of the Wechsler Adult Intelligence Scale (WAIS). Their scores were as follows: 12, 11, 10, 10, 10, 7, 6, 6, 5, 5. Test whether this sample could be representative of a population whose mean is known to be 10.00.

Correct Answer
verified
t=-2.140 F...
View Answer

Increasing the confidence-interval level from .95 to .

Correct Answer
verified

Other things being equal, the fewer the degrees of freedom, the easier it is to obtain a significant t ratio.

Correct Answer
verified

Other things being equal, the smaller the value of the estimated standard error of the mean, the narrower the confidence interval becomes.

Correct Answer
verified

For the following set of sample scores, find the estimated standard error of the mean: 23, 20, 21, 24, 18, 22, 24, 22, 20, 20.

Correct Answer
verified

The relationship between the alpha level and the confidence level is such that

Correct Answer
verified

The fact that the point estimate of the population mean may be inaccurate (even with random sampling) is due largely to

Correct Answer
verified

For the t ratio, other things being equal, having 1 degree of freedom rather than 12 degrees of freedom makes it

Correct Answer
verified

Exam 8: Parameter Estimates

The true standard deviation of the sample may be used directly to estimate the point value of the population mean.

Correct AnswerverifiedShow Answer

A confidence interval of .99 predicts a narrower range of mean values than does an interval of .

Correct AnswerverifiedShow Answer

With very small sample sizes, the estimated standard deviation of the population yields a slightly higher value than does the true standard deviation of the sample.

Correct AnswerverifiedShow Answer

The term "confidence" expresses the probability that one's estimate is

Correct AnswerverifiedShow Answer

For the following set of sample scores, find the estimated standard error of the mean: 20, 14, 16, 18, 9, 16, 18, 16, 15, 14.

Correct AnswerverifiedShow Answer

In order to calculate the estimated standard error of the mean, one need only know

Correct AnswerverifiedShow Answer

When a given difference is determined to be "significant", then

Correct AnswerverifiedShow Answer

With a sample size of 30, the single-sample t ratio has 1 degree of freedom.

Correct AnswerverifiedShow Answer

The estimated standard error of the mean is equal to

Correct AnswerverifiedShow Answer

With infinite degrees of freedom, the t distribution approaches normality.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The estimated standard error of the mean is

Correct AnswerverifiedShow Answer

A random sample of 10 adult subjects was selected and tested on the Vocabulary sub-test of the Wechsler Adult Intelligence Scale (WAIS). Their scores were as follows: 12, 11, 10, 10, 10, 7, 6, 6, 5, 5. Test whether this sample could be representative of a population whose mean is known to be 10.00.

Correct Answerverifiedt=-2.140 F...View AnswerShow Answer

Increasing the confidence-interval level from .95 to .

Correct AnswerverifiedShow Answer

Other things being equal, the fewer the degrees of freedom, the easier it is to obtain a significant t ratio.

Correct AnswerverifiedShow Answer

Other things being equal, the smaller the value of the estimated standard error of the mean, the narrower the confidence interval becomes.

Correct AnswerverifiedShow Answer

For the following set of sample scores, find the estimated standard error of the mean: 23, 20, 21, 24, 18, 22, 24, 22, 20, 20.

Correct AnswerverifiedShow Answer

The relationship between the alpha level and the confidence level is such that

Correct AnswerverifiedShow Answer

The fact that the point estimate of the population mean may be inaccurate (even with random sampling) is due largely to

Correct AnswerverifiedShow Answer

For the t ratio, other things being equal, having 1 degree of freedom rather than 12 degrees of freedom makes it

Correct AnswerverifiedShow Answer

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t=-2.140 F...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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