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Chapter 4: Q. 53 (page 263)

Want a snack- Can snacking on fruit rather than candy reduce later food consumption? Researchers randomly assigned12women to eat either65 calories of berries or 65calories of candy. Two hours later, all 12women were given an unlimited amount of pasta to eat. The researchers recorded the amount of pasta consumed by each subject. The women who ate the berries consumed133 fewer calories, on average. Identify the

explanatory and response variables, the experimental units, and the treatments.

Short Answer

Expert verified

The explanatory variable is calorie consumed by person , response variables is food consumption , the experimental units is amount of pizza , and the treatments is eating 65of either calories of berries or65calories of candy .

Step by step solution

01

Given information

We need to find the explanatory , response variables, the experimental units, and the treatments in this case

02

Explanation

The reaction variable is the point of interest of a query in a look at or experiment. An explanatory variable is one which explains adjustments in that variable.

Here reaction variable is meals intake and explanatory variable is calorie fed on via way of means of person .

Also, experimental devices is quantity of pasta and remedy is consuming of either 65energy of berries or 65energy of candy .

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Most popular questions from this chapter

SRS of students? At a party, there are 30 students over age 21 and 20students underage21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about their attitudes toward alcohol. You have given every student at the party the same chance to be interviewed. Is your sample an SRS? Explain your answer.

Tonya wanted to estimate the average amount of time that students at her school spend on Facebook each day. She gets an alphabetical roster of students in the school from the registrar’s office and numbers the students from 1 to 1137. Then Tonya uses a random number generator to pick 30 distinct labels from 1 to 1137. She surveys those 30 students about their Facebook use. Tonya’s sample is a simple random sample because

a. it was selected using a chance process.

b. it gave every individual the same chance to be selected.

c. it gave every possible sample of size 30 an equal chance to be selected.

d. it doesn’t involve strata or clusters.

e. it is guaranteed to be representative of the population.

Your statistics class has 30students. You want to ask an SRS of 5students from your class whether they use a mobile device for the online quizzes. You label the students 01,02,...,30. You enter the table of random digits at this line: 1445926056314248037165103622532249061181

Your SRS contains the students labeled

a. 14,45,92,60,56

b. 14,31,03,10,22

c. 14,03,10,22,22

d.14,03,10,22,06

e.14,03,10,22,11

Running red lights An SRS of 880 drivers was asked: “Recalling the last

ten traffic lights you drove through, how many of them were red when you entered the

intersections?” Of the 880 respondents, 171 admitted that at least one light had been red.

A practical problem with this survey is that people may not give truthful answers. Explain

the likely direction of the bias.

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

a dormitory on campus. You label the students 001to816in alphabetical order. In the

table of random digits, you read the entries

9559294007697693354772450166328119414873

The first three students in your sample have labels.

a.955,929,400.b.400,769,769.c.559,294,007.d.929,400,769.e.400,769,335.
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