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Music and memory Is it a good idea to listen to music when

Chapter 5, Problem 47E

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QUESTION:

Cholesterol      Assume the cholesterol levels of adult American women can be described by a Normal model with a mean of 196 mg/dL and a standard deviation of 27.

a) Draw and label the Normal model.

b) What percent of adult women do you expect to have cholesterol levels over 200 mg/dL?

c) What percent of adult women do you expect to have cholesterol levels between 170 and 180 mg/dL?

d) Estimate the IQR of the cholesterol levels. e) Above what value are the highest 15% of women’s cholesterol levels?

Questions & Answers

QUESTION:

Cholesterol      Assume the cholesterol levels of adult American women can be described by a Normal model with a mean of 196 mg/dL and a standard deviation of 27.

a) Draw and label the Normal model.

b) What percent of adult women do you expect to have cholesterol levels over 200 mg/dL?

c) What percent of adult women do you expect to have cholesterol levels between 170 and 180 mg/dL?

d) Estimate the IQR of the cholesterol levels. e) Above what value are the highest 15% of women’s cholesterol levels?

ANSWER:

Problem 47E

Music and memory Is it a good idea to listen to music when studying for a big test? In a study conducted by some Statistics students, 62 people were randomly assigned to listen to rap music, Mozart, or no music while attempting to memorize objects pictured on a page. They were then asked to list all the objects they could remember. Here are the 5-number summaries for each group:

a) Describe the W’s for these data: Who, What, Where, Why, When, How.

b) Name the variables and classify each as categorical or quantitative.

c) Create parallel boxplots as best you can from these summary statistics to display these results.

d) Write a few sentences comparing the performances of the three groups.

                                                               Step by Step Solution

Step 1 of 5

Given:

The sample number of people randomly selected is .

People are assigned to listen to rap music, Mozart, or no music while attempting to memorize objects pictured on a page.

The 5-number summary is as follows,

 

n

Min

Q1

Median

Q3

Max

Rap

29

5

8

10

12

25

Mozart

20

4

7

10

12

27

None

13

8

9.5

13

17

24

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