Deck 12: t(ea) for Two (Again): Tests Between the Means of Related Groups

Question 1

What is the test statistic calculated by the statistical procedure selected known as?

A) Critical value
B) Significance level
C) Obtained value
D) p value

Answer 1

C

Question 2

What is the formula used to calculate degrees of freedom for a t test for dependent groups?

A) n? - 1
B) n? + n? - 1
C) n? - 1 + n?
D) n? + n?

Answer 2

A

Question 3

What does the Excel function TTEST compute?

A) t value
B) Probability of the t value occurring
C) Critical t value
D) Obtained t value

Answer 3

B

Question 4

What is used to examine the degree of relationship between variables?

A) Hypothesized mean difference
B) Pearson correlation
C) Observations
D) Variance

Question 5

In the following, what are the degrees of freedom: t???? = 2.001, p < .05?

A) 29
B) 30
C) 31
D) 32

Question 6

In a t test for dependent samples that examines the difference between a pretest and posttest, what type of hypothesis is used?

A) Nondirectional
B) Directional
C) Null
D) Research

Question 7

If the obtained value is less than the critical value, what should you do?

A) Reject the null hypothesis
B) Accept the null hypothesis
C) Reduce the p value
D) Decrease your sample

Question 8

To compute the test statistic or t value you must first approximate the sample size through calculating the?

A) Pooled variance
B) Standard deviation
C) Degrees of freedom
D) Mean score

Question 9

What is another name for a dependent samples t test?

A) Paired sample
B) Two sample
C) Independent sample
D) Freed sample

Question 10

What is another name that statisticians call dependent tests?

A) Regression
B) Correlation
C) Repeated measures
D) Group differences

Question 11

How many subjects were examined based on the following: t???? = 2.001, p < .05?

A) 29
B) 30
C) 31
D) 32

Question 12

How many observations are there for each case in a t test for dependent samples?

A) One
B) Two
C) Three
D) Four

Question 13

Which of the following represents degrees of freedom?

A) fd
B) df
C) d
D) f

Question 14

If the obtained value is greater than the critical value, what should you do?

A) Reject the null hypothesis
B) Accept the null hypothesis
C) Set a higher p value
D) Increase your sample

Question 15

What Excel function requires that you enter the t value, degrees of freedom, and the number of tails?

A) TTEST
B) TEST2
C) TDIST
D) TDIST2

Question 16

To determine whether the null hypothesis should be rejected, the test statistic must be compared against which of these?

A) Critical value
B) Significance level
C) Obtained value
D) p value

Question 17

To examine one group of subjects under two different conditions, which statistical technique should you select?

A) Regression
B) t test for dependent samples
C) Analysis of variance
D) t test for independent samples

Question 18

In order to be 99% confident you have not committed a Type I error, at what level should you set your p value?

A) .01
B) .10
C) .05
D) .15

Question 19

In the formula that computes a t value, what does n?D represent?

A) Sum of the difference between groups
B) Sum of the means for Group 1
C) Sum of the means for Group 2
D) Sum of the differences squared

Question 20

Which of the following relates to the difference you expect?

A) Hypothesized mean diff.
B) Pearson correlation
C) Observations
D) Variance

Question 21

What is another term that statisticians use when talking of dependent tests? Explain.

Question 22

What does the t test for dependent samples allow you to examine?

Question 23

Explain the difference between a test of dependent and independent means.

Question 24

When using the Amazing Analysis ToolPak to compute t value for dependent samples, which test should you select?

Question 25

Given the following, what should you conclude? t???? = 2.001 and tc??t?c?l = 1.94

Question 26

What does t stat represent?

Question 27

Consider the following set of conditions: The focus is the difference between scores on a pretest and a posttest, the participants are being tested more than once, and there are two groups. Which test should you use?

Question 28

What does t critical one-tail represent?

Question 29

What does P(T<=t) two-tail represent?

Question 30

What is the formula for calculating a t value for a dependent samples test?