A sample of chocolate bars from a factory are weighed and the results are 201.3, 201.7, 202.0, 202.4, 202.8, and 203.0 grams. Find

a. the 90 percent confidence interval for the population mean of the weight of a chocolate bar.

b. the 95 percent confidence interval for the population mean of the weight of a chocolate bar.

c. the 99 percent confidence interval for the population mean of the weight of a chocolate bar.

d. Is it unreasonable to believe, given these data, that the population mean of the weight of a chocolate bar is 200 grams? POLI967