# ay hinge on theolointereseffectsEXERCISES1. The stress levels of 30 unemployed laborerswere measured by a questionnaire beforeand after a real job interview. The stresslevel rose from a mean of 63 points to amean of 71 points. The (unbiased) standarddeviation of the difference scores was 18.a. What is the appropriate null hypothesisfor this example?teumi odw ncorb. What is the critical value of t for a .05,two-tailed test? otmed irc. What is the observed (i.e., calculated)value of t?3.19rdd. What is your statistical decision withrespect to the null hypothesis?c.Glven your conclusion in part d, couldyou be making a Type I or Type II error?2. In Exercise 7B9, participants in an individ-others in a group motivation condition inual motivation condition were compared toterms of task performance. Now assumethat

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Question 1 help_outlineImage Transcriptioncloseay hinge on the olo interes effects EXERCISES 1. The stress levels of 30 unemployed laborers were measured by a questionnaire before and after a real job interview. The stress level rose from a mean of 63 points to a mean of 71 points. The (unbiased) standard deviation of the difference scores was 18. a. What is the appropriate null hypothesis for this example?teumi odw ncor b. What is the critical value of t for a .05, two-tailed test? otmed ir c. What is the observed (i.e., calculated) value of t? 3. 19rd d. What is your statistical decision with respect to the null hypothesis? c.Glven your conclusion in part d, could you be making a Type I or Type II error? 2. In Exercise 7B9, participants in an individ- others in a group motivation condition in ual motivation condition were compared to terms of task performance. Now assume that fullscreen
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Step 1

Hello there! there are more than three subparts in the question. According to our policies we cannot answer more than three sub parts in one question. So please find the solution for a,b,c parts of the question. If you have doubts in remaining part of the question kindly make a new request, mentioning the part in which you need help.

Given Data

n = 30

Let

1 subscript denotes before stress level and 2 denotes after stress level

Step 2

Formulation of Hypo... help_outlineImage TranscriptioncloseNull Hypothesis Ho:H1= 42 Alternative Hypothesis H1: 2 a) Appropriate Null Hypothesis is The stress level is same before and after Null Hypothesis Ho:4= 42 b) critical-value oft for two tailed test is given by Finding the t-critical - 2.048(From Excel T.INV(0.025,29) 30-1 to.05 c) Observed value of t is given by х, — х, t 63 71 -2.434 18 30 fullscreen

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### Hypothesis Testing 