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1.A board-game club meets each week at the local library. People bring different board games to play, like checkers and chess. Out of the 50 people that meet each week, 67% prefer to play checkers over chess. Construct an 83% confidence interval for the population mean of people that prefer to play checkers over chess.

CI = (56.06%, 77.94%)

CI = (49.88%, 84.12%)

CI = (53.97%, 80.03%)

CI = (57.89%, 76.14%)

2.The grades for the latest statistics exam are normally distributed. The mean was 93 with a standard deviation of 4. Without using a calculator, what is the probability that you will receive a grade that is between 89 and 97 on this exam?

47.72%

68.24%

95.44%

99.74%

3.

If a fair, six-sided die is rolled twice, what is the probability it will land on 1 and then 6?

2.78%

3.57%

16.67%

33.33%

7.What is the probability of drawing a diamond or a spade card from a standard deck of cards and rolling a 2 on a six-sided die?

25%

4.2%

8.3%

10.7%

8.A candy company claims that their bags of jellybeans have a mean weight of 9.45 oz. 125 randomly chosen bags of jellybeans were sampled, and it was discovered that their mean weight was 9.68 oz, with a standard deviation of 1.23 oz. Test this hypothesis using a 99% confidence level.

Fail to reject the null hypothesis. There is enough evidence to oppose the company's claim.

Reject the null hypothesis. There is not enough evidence to oppose the company's claim.

Fail to reject the null hypothesis. There is not enough evidence to oppose the company's claim.

Reject the null hypothesis. There is enough evidence to oppose the company's claim.

9.The length of adult parakeets is normally distributed. If the mean length is 8 inches with a standard deviation of 0.25 inches, what is the probability that a randomly selected adult parakeet will be less than 7.55 inches long?

5.74%

96.41%

15.43%

3.59%

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Answered by SirGarcia on coursehero.com

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