An education researcher is interested in instructors’ use of images/text in the

Question

An education researcher is interested in instructors’ use of images/text in the design their lecture slides. A simple random sample of 30 instructors at the University of Guelph each provide her with a single representative slide from their lectures. Then, she uses scanning software to measure the percentage of slide area covered by images/text on each slide.

a. Which of the following statistical procedures should the researcher use to estimate the percentage of University of Guelph instructors who cover more than 50% of their slide area with images/text?

Confidence interval for one mean

One-sample t-test

Confidence interval for one proportion

Test for one proportion

b. Which of the following statistical procedures should the researcher use to find out about the average percentage of slide area University of Guelph instructors cover with images/text?

Confidence interval for one mean

One-sample t-test

Confidence interval for one proportion

Test for one proportion

Explanation / Answer

a. Since the researcher wants to estimate the percentage of instructors who cover mor than 50% of their slide area with images, the appropriate procedure should be confidence interval for one mean.

b. Since the researcher wants to find out about the average percentage of slide area that the instructors cover with images, the appropriate procedure should be one sample t-test.

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