(1 point) A study is conducted to determine if a newly designed text book is mor

Question

(1 point) A study is conducted to determine if a newly designed text book is more helpful to learning the material than the old edition. The mean score on the final exam for a course using the old edition is 75. Ten randomly selected people who used the new text took the final exam. Their scores are showm in the table below Test Score 6 5 syif cance level to te Use a 0 10.8. the claim that peo le do better with the new eddon Assume that the scores are no maly dist euted and that the populaan standard dew on . (a) What kind of test should be used? A. One-Taled O B. Two-Taled OC. It does not matter (b) The test statistic is (rounded to 2 decimals) (c) The P-value is (d) is there sufficient evidence to support the claim that people do better than 75 on this exam? A.Yes B. No using the new text

Explanation / Answer

the hypothesis :

Ho : mean <= 75

H1 : mean >75

a. since we have only > sign in alternative hypothesis so it a one tailed test.

b. test statistic :

sample mean is = sum of the test scores / 10 = 84.4

n=10

Z = (84.4 - 75) / (10.8 / sqrt 10) =

2.752353

c. p value is from the standard normal table =

0.0030

level of significance = 0.005

p value < level of significance

we reject the null hypothesis

d. Yes . because we have sufficience evidence for alternative hypothesis.

2.752353

c. p value is from the standard normal table =

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