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Chapter 4: Q. T4.10 (page 290)

Can texting make you healthier? Researchers randomly assigned 700Australian adults

to either receive usual health care or usual heath care plus automated text messages with

positive messages, such as 鈥淲alking is cheap. It can be done almost anywhere. All you

need is comfortable shoes and clothing.鈥� The group that received the text messages

showed a statistically significant increase in physical activity鈥渟tatistically significant鈥� in this context?

a. The results of this study are very important.

b. The results of this study should be generalized to all people.

c. The difference in physical activity for the two groups is greater than 0.

d. The difference in physical activity for the two groups is very large.

e. The difference in physical activity for the two groups is larger than the difference

that could be expected to happen by chance alone.

Short Answer

Expert verified

The correct option is:

e. The difference in physical activity for the two groups is larger than the difference that could be expected to happen by chance alone.

Step by step solution

01

Given information

We have been given four options from which we have to select the correct one.

a. The results of this study are very important.

b. The results of this study should be generalized to all people.

c. The difference in physical activity for the two groups is greater than.

d. The difference in physical activity for the two groups is very large.

e. The difference in physical activity for the two groups is larger than the difference

that could be expected to happen by chance alone.

02

Explanation

Researchers from the University of Michigan's Department of Family Medicine have shown that, in addition to facilitating everyday dialogue, texting can help people adopt healthier behaviours and make it easier for health researchers to collect data.

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Most popular questions from this chapter

A gardener wants to try different combinations of fertilizer (none, 1cup, 2cups) and mulch (none, wood chips, pine needles, plastic) to determine which combination produces the highest yield for a variety of green beans. He has 60green-bean plants to use in the experiment. If he wants an equal number of plants to be assigned to each treatment, how many plants will be assigned to each treatment?

a. 1

b. 3

c. 4

d. 5

e.12

To investigate if standing up while studying affects performance in an algebra class, a teacher assigns half of the 30students in his class to stand up while studying and assigns the other half to not stand up while studying. To determine who receives which treatment, the teacher identifies the two students who did best on the last exam and randomly assigns one to stand and one to not stand. The teacher does the same for the next two highest-scoring students and continues in this manner until each student is assigned a treatment.

Which of the following best describes this plan?

a. This is an observational study.

b. This is an experiment with blocking.

c. This is a completely randomized experiment.

d. This is a stratified random sample.

e. This is a cluster sample.

Seed weight (2.2) Biological measurements of the same species often follow a normal distribution quite closely. The mean weights of seeds of a variety of winged beans are approximately normal, with a mean of 525milligrams (mg) and a standard deviation of 110mg.

a. What percent of seeds weigh more than 500mg?

b. If we discard the lightest 10%of these seeds, what is the smallest weight among the remaining seeds?

Corn variety 1yielded 140bushels per acre last year at a research farm. This year, corn

variety 2, planted in the same location, yielded only 110bushels per acre. Based on these

results, is it reasonable to conclude that corn variety 1is more productive than corn variety

2?

a. Yes, because 140bushels per acre is greater than 110bushels per acre.

b. Yes, because the study was done at a research farm.

c. No, because there may be other differences between the two years besides the corn

variety.

d. No, because there was no use of a placebo in the experiment.

e. No, because the experiment wasn鈥檛 double-blind.

More testosterone Refer to Exercise 56. Could blinding be used in this experiment? Explain your reasoning. Why is blinding an important consideration in this context?

See all solutions

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