The femur is a bone found in the legs of walking mammals. The length of the femur is approximately normal in each species. To estimate the population mean length for male adults, 19 male adults are randomly selected. The sample mean of femur length was 44.2 cm and the standard deviation was 2.3 cm. TYPE your answers into the box below. Make sure to answer EACH of the FOUR PARTS and JUSTIFY your reasoning. a. Calculate a 95% confidence interval for the population mean. Round final answer to three decimal places. b. Interpret a 95% confidence interval for the population mean. c. If you changed the confidence level to 99%, what would happen to the margin of error? The margin of error would d. If you changed the sample size to 25, what would happen to the margin of error? The margin of error would