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A tool company claims that the mean number of defective screws they...

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# A tool company claims that the mean number of defective screws they...

1. A tool company claims that the mean number of defective screws they produce per box is 72. The mean number of defective screws in 100 randomly chosen boxes was found to be 76, with a standard deviation of 19. Test this hypothesis.

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

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

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

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

1. A social media company claims that over 1 million people log onto their app daily. To test this claim, you record the number of people who log onto the app for 65 days. The mean number of people to log in and use the social media app was discovered to be 998,946 users a day, with a standard deviation of 23,876.23. Test the hypothesis using a 1% level of significance.

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

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

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

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

1. The mean weight from a sample of 256 computer parts created by a computer manufacturer was 274.3 grams, with a standard deviation of 25.9 grams. Can this company claim that the mean weight of its manufactured computer parts will be less than 275 grams? Test this hypothesis using a 1% level of significance.

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

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

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

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

1. 50 high school students were asked how many hours they study per day. The mean was 1.5 hours, with a standard deviation of 0.5 hours. Using a 5% level of significance, what could we claim about the mean study time of the entire population of high school students so that the hypothesis will fail to be rejected?

1. The mean time it takes for a random sample of 758 airplanes to fly from Florida to New York was shown to be 165 minutes, with a standard deviation of 45 minutes. Using a 95% confidence level, which one of the following null hypotheses will be rejected?

## Answer & Explanation

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Answered by mrinconj on coursehero.com

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## Step-by-step explanation

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