please check the uploaded file for all the questions. An independent-samples t-test is appropriate when __________.a.

you are interested in changes in symptoms before and after medication useb.the mean for a sample of subjects is compared to a known population meanc.the value for σ is knownd.there are two separate samples containing different subjectse.the value of SD of population is knownAn independent-samples t-test is appropriate when __________.

a.

you are interested in changes in symptoms before and after medication use

b.

the mean for a sample of subjects is compared to a known population mean

c.

the value for σ is known

d.

there are two separate samples containing different subjects

e.

the value of SD of population is known

You are conducting a dependent t-test with 29 participants. If the results are evaluated using a one-tailed

test with a = .05, then the critical region would be __________.

a.

-2.052 or 2.052

b.

-1.703 or 1.703

c.

-2.052 and 2.052

d.

-1.701 or 1.701

e.

-1.703 and 1.703

f.

-1.701 and 1.701

“A researcher wants to examine the effects of siblings on the amount of annual salary people earned

when they are 35 years old. Salary data of three groups of 35-year olds were collected and are

presented here. 4 participants with no sibling while growing up (n1 = 4): 50K, 51K, 49K, 50K. 5

participants with 1 to 2 siblings while growing up (n2 = 5): 55K, 56K, 54K, 58K, 52K. 4 participants with 3

2

and more siblings while growing up (n3 = 4): 60K, 60K, 70K, 50K. The researcher calculated: ∑x =

2

2

39747, G /N = 39325, ∑T /n = 39525.” Do the data indicate significant differences among the three

groups of 35-year olds? Test at the alpha = .05 level.

a.

Yes, the calculated F value was not larger than the critical F value; results were statistically

significant and to reject the null hypothesis.

b.

Yes, the calculated F value was not larger than the critical F value; results were not

statistically significant and fail to reject the null hypothesis.

c.

No, the calculated F value was not larger than the critical F value; results were not

statistically significant and fail to reject the null hypothesis.

d.

No, the calculated F value was larger than the critical F value; results were statistically

significant and to reject the null hypothesis.

e.

No, the calculated F value was not larger than the critical F value; results were statistically

significant and to reject the null hypothesis.

f.

Yes, the calculated F value was larger than the critical F value; results were statistically

significant and to reject the null hypothesis.

g.

It is impossible to make a decision about H0 without more information

A clinical psychologist wants to study whether returning soldiers from Afghanistan report more PTSD

symptoms than soldiers returning from Iraq. Soldiers self report symptoms. Results for the two groups

are: (a) 16 Afghanistan veterans with the mean of 24 and its sample SD of 5. (b) 14 Iraq veterans with

the mean of 21 and its sample SD of 4.” What is the size of the effect size?

a.

A medium effect size

b.

A meaningless effect size

c.

An effect size of 3

d.

None of the mentioned

e.

A large effect size

f.

A small effect size

“A researcher wants to examine the effects of siblings on the amount of annual salary people earned

when they are 35 years old. Salary data of three groups of 35-year olds were collected and are

presented here. 4 participants with no sibling while growing up (n1 = 4): 50K, 51K, 49K, 50K. 5

participants with 1 to 2 siblings while growing up (n2 = 5): 55K, 56K, 54K, 58K, 52K. 4 participants with 3

2

and more siblings while growing up (n3 = 4): 60K, 60K, 70K, 50K. The researcher calculated: ∑x =

2

2

39747, G /N = 39325, ∑T /n = 39525.” What is the Tukey’s Honestly Significant Difference?

a.

8.18

b.

7.17

c.

12.42

d.

8.78

e.

11.99

f.

5.88

g.

8.83

h.

9.14

i.

11.10

j.

7.99

A sample of n = 30 scores produces a calculated t statistic of t = -2.029. If the researcher is using a onesample t-test and is testing his hypothesis at the alpha=.05 level, the correct statistical decision is:

a.

The researcher can reject the null hypothesis if this was a directional hypothesis but not if it

was a non-directional hypothesis.

b.

The researcher can fail to reject the null hypothesis whether it was a directional or nondirectional hypothesis.

c.

It is impossible to make a decision about H0 without more information

d.

The researcher can reject the null hypothesis whether it was a directional or non-directional

hypothesis.

e.

The researcher can fail to reject the null hypothesis if this was a directional hypothesis but

not if it was a non-directional hypothesis.

“A clinical psychologist wants to study whether returning soldiers from Afghanistan report more PTSD

symptoms than soldiers returning from Iraq. Soldiers self report symptoms. Results for the two groups

are: (a) 16 Afghanistan veterans with the mean of 24 and its sample SD of 5. (b) 14 Iraq veterans with

the mean of 21 and its sample SD of 4.” Do soldiers deployed to Afghanistan report more symptoms?

Test at the alpha = .05 level.

a.

It is impossible to make a decision about H0 without more information.

b.

No, one-tailed t-test results were not statistically significant and fail to reject the null

hypothesis.

c.

Yes, two-tailed t-test results were statistically significant and reject the null hypothesis.

d.

No, two-tailed t-test results were not statistically significant and fail to reject the null

hypothesis.

e.

Yes, one-tailed t-test results were statistically significant and reject the null hypothesis.

“A researcher wants to examine the effects of siblings on the amount of annual salary people earned

when they are 35 years old. Salary data of three groups of 35-year olds were collected and are

presented here. 4 participants with no sibling while growing up (n1 = 4): 50K, 51K, 49K, 50K. 5

participants with 1 to 2 siblings while growing up (n2 = 5): 55K, 56K, 54K, 58K, 52K. 4 participants with 3

2

and more siblings while growing up (n3 = 4): 60K, 60K, 70K, 50K. The researcher calculated: ∑x =

2

2

39747, G /N = 39325, ∑T /n = 39525.” What is the size of the effect size?

a.

An effect size of 3

b.

A meaningless effect size

c.

A medium effect size

d.

None of the mentioned

e.

A large effect size

f.

A small effect size

A researcher wants to examine the effects of siblings on the amount of annual salary people earned when

they are 35 years old. Salary data of three groups of 35-year olds were collected and are presented here.

4 participants with no sibling while growing up (n1 = 4): 50K, 51K, 49K, 50K. 5 participants with 1 to 2

siblings while growing up (n2 = 5): 55K, 56K, 54K, 58K, 52K. 4 participants with 3 and more siblings

2

2

while growing up (n3 = 4): 60K, 60K, 70K, 50K. The researcher calculated: ∑x = 39747, G /N = 39325,

2

∑T /n = 39525.” What is the answer for SSwithin group + SSbetween group?

a.

118,597

b.

79,272

c.

222

d.

79,072

e.

200

f.

844

g.

422

h.

158,122

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