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APS25-3 Which Procedure?

Last updated almost 5 years ago

6 questions

Determine the type of procedure you would carry out for each prompt.

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Question 1

1.

A union organization would like to represent the employees at the local market. A sample of the employees revealed 74 of 120 were in favor of the union. Is there evidence that the union has the 3/5 majority required?

Which procedure would you use?

1-prop z-test

1-prop z-interval

2-prop z-test

2-prop z-interval

1-sample t-test

1-sample t-interval

2-sample t-test

2-sample t-interval

matched pairs t-test

matched pairs t-interval

Question 2

2.

An oral surgeon is interested in estimating how long it takes to extract all four wisdom teeth. The doctor records the times for 24 randomly chosen surgeries. Estimate the time it takes to perform the surgery.

Which procedure would you use?

1-prop z-test

1-prop z-interval

2-prop z-test

2-prop z-interval

1-sample t-test

1-sample t-interval

2-sample t-test

2-sample t-interval

matched pairs t-test

matched pairs t-interval

Question 3

3.

A microwave manufacturing company receives large shipments of thermal shields from
two suppliers. A sample from each supplier’s shipment is selected and tested for the rate of defects. The microwave manufacturing company’s contract with each supplier states the shipment with the smallest rate of defect will be accepted. Do the shipments’ defect rates vary significantly from each other?

Which procedure would you use?

1-prop z-test

1-prop z-interval

2-prop z-test

2-prop z-interval

1-sample t-test

1-sample t-interval

2-sample t-test

2-sample t-interval

matched pairs t-test

matched pairs t-interval

Question 4

4.

The owner of a construction company would like to know if his current work teams can
build room additions quicker than the time allotted for by the contract. A random sample of 15 room additions (each had its own allotted contracted time) completed recently revealed an average completion time of 0.32 days faster than contracted. Is this strong evidence that the teams can complete room additions in less than the contract times?

Which procedure would you use?

1-prop z-test

1-prop z-interval

2-prop z-test

2-prop z-interval

1-sample t-test

1-sample t-interval

2-sample t-test

2-sample t-interval

matched pairs t-test

matched pairs t-interval

Question 5

5.

A farmer would like to know if a new fertilizer increases his crop yield. In an effort to
decide this, the farmer recorded the yield for 10 different fields prior to adding fertilizer
and after adding the fertilizer. The farmer assumes the crop yields are approximately
normal. Does the fertilizer work as advertised?

Which procedure would you use?

1-prop z-test

1-prop z-interval

2-prop z-test

2-prop z-interval

1-sample t-test

1-sample t-interval

2-sample t-test

2-sample t-interval

matched pairs t-test

matched pairs t-interval

Question 6

6.

In a study to estimate the difference between the average jail time convicted bank robbers and car thieves are sentenced to, the law students randomly selected 20 cases of each type that resulted in jail sentences during the previous year.

Which procedure would you use?

1-prop z-test

1-prop z-interval

2-prop z-test

2-prop z-interval

1-sample t-test

1-sample t-interval

2-sample t-test

2-sample t-interval

matched pairs t-test

matched pairs t-interval