Research shows that feline weight (measured in kg) follows a normal distribution with

a standard deviation of 0.8 kilograms. From a random sample of 100 felines, the sample mean weight is 6.8 kilograms.

(a) Find a 95% confidence interval (C.I) for the population mean feline weight. Show all your work. Report up to four digits.

(b) Interpret the C.I you found in part (a).

(c) Without doing any calculations, explain if C.I would be wider or narrower had the

confidence level been 90% instead of 95%.