Refer to the previous problem (Practice Problem 9).

a. Using an approximate method, provide a rough 95% confidence interval for the population mean.

b. Provide an interpretation of the interval you calculated in part (a).

Data from problem 9

One of the great discoveries of biology is that organisms have a class of genes called “regulatory genes,” whose only job is to regulate the activity of other genes. How many genes does the typical regulatory gene regulate? A study of interaction networks in yeast (S. cerevesiae)

came up with the following data for 109 regulatory genes (Guelzim et al. 2002).

Number of genes regulated 11 22 33 44 55 66 77 88 99 1010 1111 1212 Frequency 2020 1010 77 77 88 88 55 22 44 44 33 44