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### (solution)- Research has shown that losing even one night's sleep can have a significant effect on performance of complex tasks such as driving.

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Research has shown that losing even one night's sleep can have a significant effect on performance of complex tasks such as driving. To demonstrate this phenomenon, a sample of n = 25 college students completed a driving test on a closed course at noon on one day and again at noon on the following day. The students were not permitted any sleep between the two tests. For each student, the difference between the number of errors on the first day and the number or errors on the second day was recorded. For this sample, the students averaged MD = 4.7 points less errors on the first test with a variance of s2 = 64 for the difference scores.

a)Do the data indicate a significant change in driving ability? Use a two-tailed test with = .05. (Use 3 decimal places.)

t-critical = ?

t =

b)What is the appropriate conclusion? Write A, B, C, or D in the box.

Option A. Reject the null hypothesis, losing one night's sleep does not have a significant effect on performance.

Option B. Reject the null hypothesis, losing one night's sleep does have a significant effect on performance.

Option C. Fail to reject the null hypothesis, losing one night's sleep does not have a significant effect on performance.

Option D. Fail to reject the null hypothesis, losing one night's sleep does have a significant effect on performance.

C) Compute an estimated Cohen's d to measure the size of the effect. (Use 4 decimal places.)

d =

Calculate the difference scores and find MD for the following data from a repeated-measures study. (Solve for the blanks)

Subject Treatment 1 Treatment 2 D

A 12 14 Blank 1

B 7 15 Blank 2

C 10 8 Blank 3

D 8 12 Blank 4

MD =

A researcher obtains a t statistic of t = 2.00 from a repeated measures study using n = 17 participants. If the effect size is measured using r2, what value will be obtained for r2?

a. r2 = 4/16 = 0.25

b. r2 = 4.00

c. The value of r2 cannot be determined from the information provided.

d. r2 = 4/20 = 0.20

In a repeated-measures study comparing two treatments, what boundaries has the two-tailed critical region for the t statistic with = .05 and a sample of n = 12 participants?

a. t =(plus-minus sign) 2.228

b. t =(plus-minus sign) 1.796

c. t =(plus-minus sign) 1.812

d. t =(plus-minus sign) 2.201

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Research has xxxxx xxxx xxxxxx even one night's xxxxx can have a xxxxxxxxxxx xxxxxx xx performance xx xxxxxxx xxxxx xxxx xx xxxxxxxx xx xxxxxxxxxxx this phenomenon, x sample of n = xx xxxxxxx xxxxxxxx completed a driving xxxx xx a xxxxxx course at xxxx xx one xxx xxx xxxxx at noon on the xxxxxxxxx day. The xxxxxxxx were xxx permitted any xxxxx xxxxxxx xxx xxx tests. For each student, xxx difference xxxxxxx the xxxxxx of xxxxxx xx the xxxxx xxx and xxx xxxxxx xx xxxxxx on xxx second day was xxxxxxxxx xxx this xxxxxxx the students xxxxxxxx xx = xxx xxxxxx less xxxxxx xx xxx first xxxx xxxx a variance of xx x 64 for the xxxxxxxxxx xxxxxxx

xxxx the xxxx indicate x significant xxxxxx in driving xxxxxxxx xxx a two-tailed test xxxx = xxxx xxxx 3 decimal places.)

xxxxxxxxxx = ? 2.064

t = xxxxx

xxxxxx is the appropriate xxxxxxxxxxx Write A, xx C, or D in the xxxx

Option xx Reject xxx null xxxxxxxxxxx xxxxxx xxx xxxxxxx xxxxx does xxx have x xxxxxxxxxxx effect on xxxxxxxxxxxx

xxxxxx xx

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This paper was answered on 19-Jul-2017

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