Question

Complete: Chapter 8 Problem Set Mean = 0.0 Standard Deviation = 1.0 .5000 .2500 .2500 -4 - بنا 0 1 2 3 N -0.67 0.67 z The critical region is The Z-score boundaries for an alpha level a = .01 are: z = 2.58 and 2 = -2.58 z = 3.29 and 2 = -3.29 z = 1.96 and z = -1.96 Suppose that the calculated z statistic for a particular hypothesis test is 3.24 and the alpha is .01. This z statistic is the critical region. Therefore, the researcher reject the null hypothesis, and she conclude the alternative hypothesis is probably correct.

Answer 1

Solution : or 2500 0:2500 0.5000 -3 -2 0 1 3 2 -|| -0.67 The Critical regiow is -0.67 and 70.67 (two-tailed) Eest. The z score boundaries for an alpha level 2=00011 are: Z = +2.58 And:- and Z -- 2.58 This is determined using normal tables. |Za = 2.58 Suppose that the calculated z statistic for a particular hypothesis test is 3:24 and the alpha is oool. This z statistic is in the critical region. Therefore, the researches should reject the nell hypothesis, and she may conclude the alternative is probably correct. hy bothesis

A graduate student believes that people consider faces with more contrast between eye color and skin tone as more feminine. She identifies the rull and alternative hypother's as; Ho: The level of contrast between eye color and skin tone does not affect how feminine a face is considered Hii The level of contrast between eye colos and skin tone affects how femine a face is considered X= 0.001 27 Two possible decisions that the graduate student can make given her choices of Ho and Hi. 10 There is not enough evidence to reject the hypothesis that the contrast between eye color and skin zone does not affect now femininea face is considered There is enough evidence to reject the hypothesis that the contrast between eye color and skin tone does not affect how feminine a face is considered. What conclusion / decision should the graduate student make if the test statistic is in the critical region ? Ans- The graduate student should Reject the Null Hypothesis (Ho).