Score: 0.13 of 1 pt 5 of 12 (12 complete) HW Score: 52.43%, 6.29 of 12 pts 9.3.1

Question

Score: 0.13 of 1 pt 5 of 12 (12 complete) HW Score: 52.43%, 6.29 of 12 pts 9.3.13-T Question Help * A study was done on proctored and nonproctored tests. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.01 significance level for both parts 1-2 n 32 x74.71 s 10.52 81.79 22.58 a. Test the claim that students taking nonproctored tests get a higher mean score than those taking proctored tests. What are the null and alternative hypotheses? H1 : 1 #P2 The test statistic, t, is(Round to two decimal places as needed.)

Explanation / Answer

The statistical software output for this problem is:

Two sample T summary hypothesis test:
?1 : Mean of Population 1
?2 : Mean of Population 2
?1 - ?2 : Difference between two means
H0 : ?1 - ?2 = 0
HA : ?1 - ?2 < 0
(without pooled variances)

Hypothesis test results:

Hence,

Test statistic = -1.63

Difference Sample Diff. Std. Err. DF T-Stat P-value ?1 - ?2 -7.08 4.3484071 45.57236 -1.6281824 0.0552

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