Question 1

The sampling distribution of t _________.

Accepted Answer

A)  gives all possible different t values of size N and the probability of getting each value if sampling is random from the null-hypothesis population 
B)  is defined as a probability distribution of the t values that would occur if all possible different samples of size N were drawn from the null hypothesis population 
C)  varies uniquely with N 
D)  all of these 
E)  a and b 
A)  gives all possible different t values of size N and the probability of getting each value if sampling is random from the null-hypothesis population 
B)  is defined as a probability distribution of the t values that would occur if all possible different samples of size N were drawn from the null hypothesis population 
C)  varies uniquely with N 
D)  all of these 
E)  a and b

Question 2

If r > 0.50, then there must be a nonzero correlation in the population.

Accepted Answer

A) True 
 B)False

Question 3

In general, if r = 0, then r = 0.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following represents a sampling distribution?

Accepted Answer

A)  the binomial distribution 
B)  the z distribution 
C)  the t distribution 
D)  all of these 
E)  the z and t distributions 
A)  the binomial distribution 
B)  the z distribution 
C)  the t distribution 
D)  all of these 
E)  the z and t distributions

Question 5

How many t distributions are there?

Accepted Answer

A)  1 
B)  2 
C)  30 
D)  one for each value of df 
A)  1 
B)  2 
C)  30 
D)  one for each value of df

Question 6

Define confidence limits.

Accepted Answer

Confidence limits, also known as confide

Question 7

Define critical value(s) of r .

Accepted Answer

The term "critical value(s) of r" typica

Question 8

For a given value of alpha, the critical value of t is _______ than the critical value of z .

Accepted Answer

A)  no different 
B)  less 
C)  greater 
D)  none of these 
A)  no different 
B)  less 
C)  greater 
D)  none of these

Question 9

A researcher believes that women today weigh less than in previous years. To investigate this belief, she randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs. The obtained value of the appropriate statistic for testing H 0 is _________.

Accepted Answer

A)  t obt = - 2.07 
B)  t obt = +2.07 
C)  t obt = - 0.32 
D)  t obt = +0.32 
A)  t obt = - 2.07 
B)  t obt = +2.07 
C)  t obt = - 0.32 
D)  t obt = +0.32

Question 10

Define the 95% confidence interval.

Accepted Answer

A 95% confidence interval is a statistic

Question 11

Which test, z or t , has higher power? Explain why?

Accepted Answer

The test with higher power is the t-test

Question 12

If | r obt | > | r crit |, we reject the assumption that r = 0.

Accepted Answer

A) True 
 B)False

Question 13

The df associated with evaluating the significance of r obt are _________.

Accepted Answer

A)  N 
B)  N - 1 
C)  N - 2 
D)  need more information 
A)  N 
B)  N - 1 
C)  N - 2 
D)  need more information

Question 14

Confidence interval is defined as _________.

Accepted Answer

A)  a range of values that probably contains the population value 
B)  a range of values that probably contains the population mean 
C)  a range of values that probably contain the population standard deviation 
D)  all of these 
A)  a range of values that probably contains the population value 
B)  a range of values that probably contains the population mean 
C)  a range of values that probably contain the population standard deviation 
D)  all of these

Question 15

As N gets _______, the critical value of t gets _________.

Accepted Answer

A)  larger; larger 
B)  smaller; smaller 
C)  larger; smaller 
D)  smaller; larger 
A)  larger; larger 
B)  smaller; smaller 
C)  larger; smaller 
D)  smaller; larger

Question 16

For N = 20, the degrees of freedom for the test of the significance of the correlation coefficient ( r ) is _________.

Accepted Answer

A)  20 
B)  21 
C)  19 
D)  18 
A)  20 
B)  21 
C)  19 
D)  18

Question 17

The mean of the t distribution equals _________.

Accepted Answer

A)  the mean of the population of raw scores 
B)  0 
C)  1 
D)  s 
A)  the mean of the population of raw scores 
B)  0 
C)  1 
D)  s

Question 18

The proper use of the t test requires that _________.

Accepted Answer

A)  the sampling distribution of   is normal 
B)  N  ≥ 30 
C)  the sampling distribution of   is normal and N ≥30 
D)  the sampling distribution of   is normal or N ≥30 
A)  the sampling distribution of   is normal 
B)  N  ≥ 30 
C)  the sampling distribution of   is normal and N ≥30 
D)  the sampling distribution of   is normal or N ≥30

Question 19

The degrees of freedom equal N - 1 for the t test for single samples.

Accepted Answer

A) True 
 B)False

Question 20

To test the significance of r obt , the df = N - 2.

Accepted Answer

A) True 
 B)False

The sampling distribution of t _________.

If r > 0.50, then there must be a nonzero correlation in the population.

In general, if r = 0, then r = 0.

Which of the following represents a sampling distribution?

How many t distributions are there?

Define confidence limits.

Define critical value(s) of r .

For a given value of alpha, the critical value of t is _______ than the critical value of z .

Define the 95% confidence interval.

Which test, z or t , has higher power? Explain why?

If | r obt | > | r crit |, we reject the assumption that r = 0.

The df associated with evaluating the significance of r obt are _________.

Confidence interval is defined as _________.

As N gets _, the critical value of t gets ___.

For N = 20, the degrees of freedom for the test of the significance of the correlation coefficient ( r ) is _________.

The mean of the t distribution equals _________.

The proper use of the t test requires that _________.

The degrees of freedom equal N - 1 for the t test for single samples.

To test the significance of r obt , the df = N - 2.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Correlation

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

Exam 13: Students T Test for Single Samples

The sampling distribution of t _________.

If r > 0.50, then there must be a nonzero correlation in the population.

In general, if r = 0, then r = 0.

Which of the following represents a sampling distribution?

How many t distributions are there?

Define confidence limits.

Define critical value(s) of r .

For a given value of alpha, the critical value of t is _______ than the critical value of z .

Define the 95% confidence interval.

Which test, z or t , has higher power? Explain why?

If | r obt | > | r crit |, we reject the assumption that r = 0.

The df associated with evaluating the significance of r obt are _________.

Confidence interval is defined as _________.

As N gets _______, the critical value of t gets _________.

For N = 20, the degrees of freedom for the test of the significance of the correlation coefficient ( r ) is _________.

The mean of the t distribution equals _________.

The proper use of the t test requires that _________.

The degrees of freedom equal N - 1 for the t test for single samples.

To test the significance of r obt , the df = N - 2.

Statistics and Scientific Method

Basic Mathematical and Measurement Concepts

Frequency Distributions

Measures of Central Tendency and Variability

The Normal Curve and Standard Scores

Correlation

Linear Regression

Random Sampling and Probability

Binomial Distribution

Introduction to Hypothesis Testing: Using the Sign Test

Power

Sampling Distributions, Sampling Distribution of the Mean: the Normal Deviate Z Test

Students T Test for Correlated and Independent Groups

Introduction to the Analysis of Variance

Introduction to the Two-Way Analysis of Variance

Chi-Square and Other Nonparametric Tests

Filters

As N gets _, the critical value of t gets ___.