Question 1

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

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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 4

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 5

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

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

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 9

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 10

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

Question 11

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 12

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

Accepted Answer

A) True 
 B)False

Question 13

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 
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 14

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 15

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 
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 16

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 17

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 
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 18

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 
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 19

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

Question 20

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

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

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

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.

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

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

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

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

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

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.

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.

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

The estimated standard error of the mean is equal to

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

Increasing the confidence-interval level from .95 to .

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.

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

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

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

The estimated standard error of the mean is

Introduction to Statistics

Percentages, Graphs and Measures of Central Tendency

Measures of Variability

The Normal Curve and Z Score

Z Scores, T Scores and Other Normal Curve Transformations

Probability

Statistics and Parameters

The Fundamentals of Research Methodology

The Hypothesis of Difference

The Hypothesis of Association: Correlation

Analysis of Variance

Nominal Categorical Data and the Chi Square

Regression Analysis

Repeated-Measures and Matched-Subjects Designs Interval Data

Non-Parametrics Revisited: the Ordinal Case

Tests and Measurements

Filters

Exam 8: Parameter Estimates

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

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

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.

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

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

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

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

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

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.

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.

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

The estimated standard error of the mean is equal to

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

Increasing the confidence-interval level from .95 to .

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.

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

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

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

The estimated standard error of the mean is

Introduction to Statistics

Percentages, Graphs and Measures of Central Tendency

Measures of Variability

The Normal Curve and Z Score

Z Scores, T Scores and Other Normal Curve Transformations

Probability

Statistics and Parameters

The Fundamentals of Research Methodology

The Hypothesis of Difference

The Hypothesis of Association: Correlation

Analysis of Variance

Nominal Categorical Data and the Chi Square

Regression Analysis

Repeated-Measures and Matched-Subjects Designs Interval Data

Non-Parametrics Revisited: the Ordinal Case

Tests and Measurements

Filters