MATH 225N Week 2 Quiz - Question and Answers

Question 1

A company has developed a wristband for monitoring blood sugar levels without requiring direct blood

samples. It is interested in demonstrating the accuracy of the device for governmental approval and has

decided to test the claim "The glucose level reported by the wristband is within 10% of a standard blood test

result." Which of the following data collection processes would be appropriate? Select only one answer

choice.

That is correct!

Choose a random sample of employees at lunchtime and measure their blood sugar using both the

wristband and a standard blood test.

Choose a random sample of people from the local area and random times throughout the day and

measure their blood sugar using both the wristband and a standard blood test.

Choose a random sample of people from the local area and random times and measure their blood sugar

using the wristband. Choose another random sample of people and random times and measure their blood

sugar using the standard blood test.

Go to a hospital and have the doctors choose a random sample of patients to be tested at random times

using both the wristband and the standard blood test.

Question 2

A farmer divided his piece of land into 4 equivalent groups. The quality of the soil is the same across

the 4 groups of land. He planted the same crop in all 4 groups of land and recorded the yield of the crop in

all 4 groups for a 4 week period. Is the study observational or experimental? If it is an experiment, what is the

controlled factor?

The study is an observational study.

The study is an experiment. The controlled factor is the 4 week observation period.

The study is an experiment. The controlled factor is the land.

The study is an experiment. The controlled factor is the growth of the crops.