Times to finish a sixteen ounce bottle of mayonnaise, were recorded by a sample of 11 purchasers. It is determined that ∑xi = 645.7 days and ∑(xi - )2 = 198.41.
(a) Obtain a point estimate of the population mean life μ and its 90% error margin.
(b) Obtain a 95% confidence interval for the mean.
(c) Obtain a 95% confidence interval for σ.
(d) What did you assume about the population in your answers to part (a) and part (b)?