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I do not know how to do problems 14 (see attachment for # 14)and 18. Please explain by showning work and providing answers.14. Based on the information given for each of the following studies, decidewhether to reject the null hypothesis. For each, give (a) the Z-score cutoff (orcutoffs) on the comparison distribution at which the null hypothesis should berejected, (b) the Z score on the comparison distribution for the sample score, and(c) your conclusion. Assume that all populations are normally distributed.----------------------------------------------------18. A researcher predicts that listening to music while solving math problems willmake a particular brain area more active. To test this, a research participant hasher brain scanned while listening to music and solving math problems, and thebrain area of interest has a percentage signal change of 58. From many previousstudies with this same math problems procedure (but not listening to music), it isknown that the signal change in this brain area is normally distributed with amean of 35 and a standard deviation of 10. (a) Using the .01 level, what shouldthe researcher conclude? Solve this problem explicitly using all five steps of hypothesistesting, and illustrate your answer with a sketch showing the comparisondistribution, the cutoff (or cutoffs), and the score of the sample on this distribution.(b) Then explain your answer to someone who has never had a course in statistics(but who is familiar with mean, standard deviation, and Z scores).
