As a part of the study of the development of thymus glands, researchers weighed the glands of chick embryos after 14 days of incubation. The thymus weights (mg) were as follows:
29.6, 30.1, 24.7, 21.5, 33.4, 29.8, 41.5, 32.9, 33.7, 28.0, 34.6, 44.9, 37.8, 23.4, 27.1, 41.5, 43.2
a) Calculate the standard error of the mean.
b) Make a QQ-plot for assessing normality of the data.
c) Construct and interpret a 90% confidence interval for the population mean.