Question

A recent article reported that there are approximately 11 minutes of actual playing time in a typical National Football League (NFL) game.† The article included information about the amount of time devoted to replays, the amount of time devoted to commercials, and the amount of time the players spend standing around between plays. Data consistent with the findings published in The Wall Street Journal are in the DATAfile named Standing. These data provide the amount of time players spend standing around between plays for a sample of 60 NFL games.

Minutes Standing Around 64.22                 51.73     73.07     66.77     66.57     61.26     59.71     69.33     65.04     72.77

62.74     67.13     63.64     75.12     69.92     66.44     69.06     68.43     62.21     66.07

72.6       65.8       62.5       63.59     69.02     69.95     72.6       63.53     69.05     64.98

64.89     62.93     67.96     65.97     72.86     67.52     73.09     75.31     68.83     71.88

63.33     64.47     63.34     69.43     60           70.69     61.75     56.32     73.72     69.66

66.39     69.41     66.72     64.55     68.1       69.33     65.62     67.92     70.16     68.92

(a)

Use the Standing data set to develop a point estimate of the number of minutes during an NFL game that players are standing around between plays.

min

Compare this to the actual playing time reported in the article.

The average actual playing time is over 6 times as much as the time spent standing around. The average actual playing time is over 7 times as much as the time spent standing around.     The average time spent standing around is over 6 times as much as the actual playing time. The average time spent standing around is over 7 times as much as the actual playing time.

(b)

What is the sample standard deviation in minutes? (Round your answer to four decimal places.)

min

(c)

Develop a 95% confidence interval for the number of minutes players spend standing around between plays. (Round your answers to three decimal places.)

min to min

Answer 1

(a) Point estimate = 66.932

The average time spent standing around is over 6 times as much as the actual playing time.

(b) s= 4.4943

(c) Lower Limit = 65.771

   Upper Limit = 68.093