14. Data set A has normal distribution; A ~ N(, 2) where and 2 are unknown. A sa

Question

14. Data set A has normal distribution; A ~ N(, 2) where and 2 are unknown. A sample of yo subjects are selected from this data set with sample mean y-92 and sample standard deviation =0.75, 90% confidence interval for population mean (p) would be: a. 90.01-95.45 b. 93.34-93.28 c. 91.77-92.23 d. 91.10-96.01 15. Assume that 50% of babies born are boys. In a sm all city, on a particular day, 8 babies were born and 6 of them were boys. On the same day in a large state, 800 babies were born and 600 of them were boys. Which statement do you agree with? a. What occurred in the city was more unusual/unexpected than what occurred in the state b. What occurred in the state was more unusual/unexpected than what occurred in the city c. The occurrences in both locales were equally unusual or unexpected d. Nothing seems unusual in either locale. 16. We test the null hypothesis that says population mean 4) is 110 (H0: -110). We draw a sample (n) of 75, and the sample mean(y) is 125 with sample standard deviation (s) of 10, The value of test statistic [Z or ] upon which we may (or may not) reject Ho would be equal to a. 10.65 b. 15.960 c. 12.99 d. 21.13

Explanation / Answer

ans 14

Standard error of the mean = SEM = S/N = 0.137

t(, N-1) = 1.699

Confidence interval = m +/- (t(, N-1)*SEM)

Mean = 92

Lower bound: 91.77

Upper bound: 92.23

PS: We are directed to solve only first if multiple questions are posted

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