AP Statistics Unit 9

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• E

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A company has 500 employees and wants to evaluate a proportion using the distribution of sample proportions and normal curve. Under which circumstance will they be able to do this?

• n = 80, p = .2

• n = 40, p = .2

• n = 40, p = .9

• n = 30, p = .4

The average points scored in an NBA game is 220 with a standard deviation of 18. Determine the likelihood that a sample of 10 games would have a mean greater than 230.

• 0.0395

• 0.0817

• 0.2893

• Cannot be determined

The average points scored in an NBA game is 220 with a standard deviation of 18. Determine the likelihood that a random sample of 40 games would have a mean less than 225.

• Cannot be determined

• 0.9605

• 0.6094

• 0.8563

10% of people are left handed. If 800 people are randomly selected, find the likelihood that at least 12% of the sample is left handed.

• 0.0297

• 0.0106

• 0.0409

• 0.0816

10% of people are left handed. Of the following, what is the smallest sample size needed to be at least 90% sure that the sample proportion will be between 9% and 11%?

• 1500

• 2000

• 2500

• 3000

A specific brand of potato chips sells bags such that the weights are N(8,0.5). If the probability that a sample of n bags has an average weight over 8.2 ounces is 0.0548, what sample size was used?

• 4

• 16

• 36

• 64