Problems1. Describe the difference between the null hypothesis and the research hypothesis of a study. Describe thedifference between directional and nondirectional research hypotheses and describe how the corresponding nullhypotheses are different,2. A group of psychologists wants to see if a 10-week self-defense training program will increase the self-esteem ofan adolescent student being bullied by classmates. Describe the two populations of interest and write bothdirectional and nondirectional research hypotheses with the corresponding null hypotheses for this study.3. If the normal curve is the comparison distribution, what are the cutoff sample scores for both conventional levelsof significance?4. Why are psychologists reluctant to use directional hypotheses and the corresponding one-tailed tests?5. Suppose the psychologists interested in the effect of a 10-week self-defense program on the self-esteem of bulliedadolescent students know that the population distribution of self-esteem scores is rand o = 12. Calculate the Z score for each of the following students, enter the cutoff sample score, and indicate theappropriate decision about the null hypothesis.y distributed with u = 66Student Student ScoreTails of Test90.05284.05394.01494.0116. Suppose the psychologists interested in the effect of a 10-week self-defense program on the self-esteem of bulliedadolescent students also want to sce if the program reduces the students" anxiety. They know that the populationdistribution of anxiety scores is normally distributed with u= 32 and o= 8. Calculate the Z score for each of thefollowing students, enter the cutoff sample score, and indicate the appropriate decision about the null hypothesis.Tails of TestStudent Student Score20.052.14.051310.012418.0117. Using the five steps of hypothesis testing, describe how a group of psychologists would determine the effect of the12-week exercise program on the life satisfaction of a person whose score on a satisfaction with life scale after theprogram is 75. The population distribution of life satisfaction scores is normal with u = 50 and o = 10. Just forpractice, write both directional and nondirectional hypotheses and test each hypothesis at both the .05 and .01 levels.Using your decision about the null hypothesis based on the one-tailed test at the .05 significance level, explain yourresponse to someone who has not had a statistics course, but who is familiar with the mean, standard deviation, andZ scores.8. Now the psychologists want to determine the effect of the 12-week exercise program on the depression of a personwhose depression score after the program is 9. The population distribution of depression scores is normal with u=15 and o- 3. Using the five steps of hypothesis testing, describe how the psychologists would conduct the study.Just for practice, write both directional and nondirectional hypotheses and test each hypothesis at both the .05 and .0Ilevels. Using your decision about the null hypothesis based on the two-tailed test at the .05 significance level,explain your response to someone who has not had a statistics course, but who is familiar with the mean, standarddeviation, and Z scores.

“Since you have asked multiple questions, we will solve the first question for you. If you want any…

1. Describe the difference between the null hypothesis and the research hypothesis of a study. Describe the difference between directional and nondirectional research hypotheses and describe how the corresponding null hypotheses are different.

1. Describe the difference between the null hypothesis and the research hypothesis of a study. Describe the difference between directional and nondirectional research hypotheses and describe how the corresponding null hypotheses are different.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Describe the significance of null hypothesis.
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