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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

Weekend birthdays Over the years, the percentage of births that are planned cesarean

sections has been rising. Because doctors can schedule these deliveries, there might be

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Saturday, or Sunday. To determine if these data provide convincing evidence that fewer than43%37 of people born since 1993were born on Friday, Saturday, or Sunday, 100simulated SRSs were selected. Each dot in the graph shows the number of people that were born on Friday, Saturday, or Sunday in a simulated SRS of 73people, assuming that each person

had a 43%chance of being born on one of these three days.

a. Explain how the graph illustrates the concept of sampling variability.

b. Based on the data from the study and the results of the simulation, is there convincing

evidence that fewer than 43%of people born since 1993were born on Friday, Saturday,

or Sunday? Explain your answer.

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controlling pests and their impact on the productivity of tomato plants. What is the best

reason for randomly assigning treatment levels (spraying or not spraying) to the

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b. Random assignment eliminates chance variation in the responses.

c. Random assignment allows researchers to generalize conclusions about the

effectiveness of the insecticides to all farms.

d. Random assignment will tend to average out all other uncontrolled factors such as

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e. Random assignment helps avoid bias due to the placebo effect.

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surgical patients from 7 different medical centers, researchers classified surgeons by the number of unsolicited complaints that had been recorded about their behavior. The researchers found that surgical complications were significantly more common in patients whose surgeons had received the most complaints, compared with patients whose surgeons had received the fewest complaints. What conclusion can we draw from this study? Explain your reasoning.

You want to take a simple random sample (SRS) of 50of the816students who live in

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A simple random sample of 1200 adult Americans is selected, and each person is asked

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