(5 pts) Assuming that you plan to construct a confidence interval for the popula

Question

(5 pts) Assuming that you plan to construct a confidence interval for the population mean , use the given data to determine whether the margin of error E should be calculated using the normal distribution or the t-distribution. a, n = 50, x=77.6; = 14.2, and the shape of the distribution is skewed. b, n = 25; 77.6; s = 14.2, and the shape of the distribution is bell shaped. c, n = 100,2=77.6; s = 14.2, and the shape of the distribution is skewed. d, n = 10, x=77.6; = 14.2, and the shape of the distribution is bell-shaped. e. n=30, p=0.60;

Explanation / Answer

a) Since population standard deviation is given, we wiil use standard normal distribution

b) Since population standard deviation is not given, we wiil use t distribution

c) Since population standard deviation is not given, we wiil use t distribution

d) Since population standard deviation is given, we wiil use standard normal distribution

e) we wiil use standard normal distribution

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