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.

57	61	86	75	73	72
20	58	81	80	83	73

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

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

2. A population has a mean of 400 and a standard deviation of 80. Suppose a sample of size 125 is selected and x^- is used to estimate u  . Use z-table.

1. What is the probability that the sample mean will be within +/- 5 of the population mean (to 4 decimals)? (Round z value in intermediate calculations to 2 decimal places.)
   
   
2. What is the probability that the sample mean will be within +/- 15 of the population mean (to 4 decimals)? (Round z value in intermediate calculations to 2 decimal places.)

Answer 1

2 5944 S 7 meun an ratng SK 819 15 13 12 582 23 R1 83 13 01 w devi cution Ler thepopulshi nn | 59447-12-X ( 68.25 ) 2 1. 시 400 mermally di stmbutel wih 시 400 Usi ng ceutyes limi These

久 をp( 0.920.0118 0.9642