Prior to the 1999–2000 NBA season, rules were changed in an effort to increase scoring and make basketball games more exciting. Previously, the league averaged 183.2 points per games. A random sample of 25 games played during December 1999 had a sample mean of 195.88 points per game, with a sample standard deviation of 20.27 points per game. What is a 95% confidence interval for the mean number of points per game after the rule change? Does this interval provide evidence of an increase in the average number of points per game?
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(187.51, 204.25). No, but this does not contradict the idea that the average number of points per game has increased.
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(187.51, 204.25). Yes, this provides firm evidence that the average number of points per game has increased.
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(174.83, 191.57). No, but this does not contradict the idea that the average number of points per game has increased.
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(174.83, 191.57). Yes, this provides firm evidence that the average number of points per game has increased.
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