Exercise 7.11) The National Football League (NFL) polls fans to develop a rating

Question

Exercise 7.11) The National Football League (NFL) polls fans to develop a rating for each football game (NFL website, October 24, 2012). Each game is rated on a scale from 0 (forgettable) to 100 (memorable). The fan ratings for a random sample of 12 games follow. Excel File: data07-11.xls 57 20 61 57 86 80 74 79 72 83 73 74 a. Develop a point estimate of mean fan rating for the population of NFL games. b. Develop a point estimate of the standard deviation for the population of NFL games to 4 decimals)

Explanation / Answer

Rcode:

NFL <- c(57,61,86,74,72,73,20,57,80,79,83,74)
mean(NFL)
sd(NFL)

output:

mean(NFL)
[1] 68
sd(NFL)
17.89363

point estimate=sample mean=68

Solutionb:

point estimate for standard deviation=

sample standard deviation=s=17.8936

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