The united states department of agriculture reports that the mean American consumption of carbonated beverages per year is greater than 52 gallons. A random sample of 30 americans yielded a sample mean of 69 gallons. Assume that the population stardard deviation is 20 gallons. Let the confidence level be 95%
A. find the point estimate of the population mean
b, calculate the standard error of the estimate
c. find the critical value for z for the confidence interval
d. construct and interpret the margin of error
e. calculate and interpret the confidence interval for the indicated confidence level for the population mean
f. how large a sample size is necessary to estimate the population mean within 25 gallons with 95% confidence?