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Test statistics

The data below represents fields of specialization for the randomly selected sample of undergraduate students. Test to determine whether there is a significant difference in the fields of specialization between regions of the country. Use a=.05 Northeast Midwest south west Total Business 54 65 28 93 240 Engineering 15 24 8 33 80 LiberalArt 65 84 33 98 280 Fine ARt 13 15 7 25 60 Health 3 12 4 21 40 Totals 150 200 80 270 700 1. State the critical value of the chi-squ... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

2860

OTA ID:

102454

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Hypothesis testing

Independent random samples taken at two companies provide the following information regarding the anual salaries of the employees. WhitneyCo. Max Co. sample size 72 50 Sample mean (in$1000) 48 43 Sample standard deviation 12 10 1.at 95% confidence test to determine whether or not there is significant difference between the average salaries of the employees of the two companies. 2. Compute the P-value.

Subject:

Statistics

Topic:

All Topics

Posting ID:

2863

OTA ID:

102524

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Determining the standard deviation using a confidence level.

A company claims the standard deviation in their delivery time is less than five days. A sample of 27 past customers is taken. The average delivery time in the sample was 14 days with a standard deviation of 4.5 days. At 95% confidence, test the companies claim.

Subject:

Statistics

Topic:

All Topics

Posting ID:

2864

OTA ID:

103058

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Calculating the probability from a given situation using mean and the standard deviation.

Brake Pads- A brake pad manufacturer claims its brake pads will last for 38,000 miles. You work for a consumer protection agency and you are testing this manufacturer's brake pads. Assume the life spans of the brake pads are normally distributed. You randomly select 50 brake pads. In your tests, the mean life of the brake pads is 37,000 miles. Assume the standard deviation is 850 miles. a) Assuming the manufacturer's claim is correct, what is the probability that the mean of the sample is 37,000 miles or less? b) Using your answer from part (a), what do you think of the manufacturer's claim? c) Would it be unusual to have an individual brake pad last for 37,000 miles? Why of w... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

2902

OTA ID:

103058

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Normal Approximations to Binomial Distributions

A survey of workers in the U.S. found that 2.9% work more than 70 hours per week. You randomly select 10 workers in the U.S. and ask each if he or she works more than 70 hours per week. a)find the probability that at most three people say they work more that 70 hours per week b)find the probability that at least three peopl say they work more than 70 hours per week c)find the probability that more than three people say they work more than 70 hours per week d)a large company is concerned about overworked employees who work more than 70 hours per week. If the company randomly selects 50 emplyees, what is the probability there will be no employee working more than 70 hours. Please show w... click for more

Subject:

Statistics

Topic:

All Topics

Posting ID:

2943

OTA ID:

101298

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