Question

a)You measure 25 textbooks' weights, and find they have a mean weight of 79 ounces. Assume the population standard deviation is 11.9 ounces. Based on this, construct a 99.5% confidence interval for the true population mean textbook weight.Keep 4 decimal places of accuracy in any calculations you do. Report your answers to four decimal places.
Confidence Interval
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b) If n=32, ¯x(x-bar)=44, and s=10, find the margin of error at a 95% confidence level.Give your answer to two decimal places.

c) If n=30, ¯x(x-bar)=50, and s=15, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place

Answer 1