Question

The National Football League (NFL) polls fans to develop a rating for each football game. Each game is rated on a scale from 0 (forgettable) to 100 (memorable). The fan ratings for a random sample of 12 games follow.

56 61 87 75 72 73

20 56 81 80 82 73

a. Develop a point estimate of mean fan rating for the population of NFL games (to 2 decimals). 68

b. Develop a point estimate of the standard deviation for the population of NFL games (to 4 decimals).

Answer 1

Consider the following table:

	56	-12	144
	61	-7	49
	87	19	361
	75	7	49
	72	4	16
	73	5	25
	20	-48	2304
	56	-12	144
	81	13	169
	80	12	144
	82	14	196
	73	5	25
SUM	816		3626

The sample mean is:

The sample standard deviation is: