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QUESTION 13 5 points In a sample of 90 grocery store customers. it is found that 63% of them were buying 15 items or fewer. Determine the upper bound of the 95% confidence interval for the proportion of customers that buy 15 items or fewer? (please express your answer AS A DECIMAL using 4 decimal places) QUESTION 14 5 points Historically, the proportion of students entering a university who finished in 4 years or less was 60%. To test whether this proportion has decreased, 118 students were examined and 50% had finished in 4 years or less. To determine whether the proportion of students who finish in 4 year or less has statistically significantly decreased (at the 5% level of signficance), what is the critical value? (please round your answer to 2 decimal places)

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7132 Gi ven that. Sample-Size (n)三90 sample. _proportion (かー0.6.3 95% Con ficdence level has 0.05 and Cnical value is1:96 5tg5X-Confidence interval for pis O.63 1.96/0.63 (I-0.63 9o 之10:530.3 <p < 0.7297 to here Lower bound .530.3 Opper bound 0-F297 9:14) Given that-n=lle_ 0-50 The nul and the alternative hypotheses ate Ho: P=0.60 Since, it is left tailed test AL 5% level-of Simica nce, z-cntical value (Rounded-to-too deci ㄧ Ζ*--1-65 al places) 21 critical value- 65

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