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Chapter 7: Q.11 (page 429)

Doing homework Refer to Exercise 9.

(a) Make a graph of the population distribution given that there are 3000 students in the school. (Hint: What type of variable is being measured?)

(b) Sketch a possible graph of the distribution of sample data for the SRS of size 100 taken by the AP Statistics students.

Short Answer

Expert verified

a). The graph of the population distribution is

b). A possible graph of the distribution of sample data is

Step by step solution

01

Part (a) Step 1: Given Information 

There are 3000students in the school.

02

Part (a) Step 2: Explanation 

We also know that 60%of the students did all their assigned homework last week.

60%脳3000=1800

Thus we then know that 1800students did all their assigned homework last week, while 1200students did not.

All bars should be the same width and height, and the number of pupils should be the same:

03

Part (b) Step 1: Given Information 

100students are in the sample.

04

Part (b) Step 2: Explanation 

We also know that approximately 60%of the students did all their assigned homework last week.60%脳100=60

As a result, we know that around 60pupils completed all of their given homework last week, whereas approximately40 kids did not.

All bars should be the same width and height, and the number of pupils should be the same:

As a result, we know that around 60 pupils completed all of their given homework last week, whereas approximately 40 kids did not.

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Most popular questions from this chapter

Squirrels and their food supply (3.2) Animal species produce more offspring when their supply of food goes up. Some animals appear able to anticipate unusual food abundance. Red squirrels eat seeds from pinecones, a food source that sometimes has very large crops. Researchers collected data on an index of the abundance of pinecones and the average number of offspring per female over 16years. Computer output from a least-squares regression on these data and a residual plot.

(a) Give the equation for the least-squares regression line. Define any variables you use.

(b) Explain what the residual plot tells you about how well the linear model fits the data.

(c) Interpret the values of r2and s in context.

The Gallup Poll has decided to increase the size of its random sample of voters from about 1500people to about 4000people right before an election. The poll is designed to estimate the proportion of voters who favor a new law banning smoking in public buildings. The effect of this increase is to

(a) reduce the bias of the estimate.

(b) increase the bias of the estimate.

(c) reduce the variability of the estimate.

(d) increase the variability of the estimate.

(e) have no effect since the population size is the same

The standard deviation of the average scores you get should be close to

(a) 114.

(b) 114/100=1.14.

(c) 114/100=11.4.

(d) 1.

(e) none of these.

Identify the population, the parameter, the sample, and the statistic in each setting.

Stop smoking! A random sample of 1000people who signed a card saying they intended to quit smoking were contacted nine months later. It turned out that 210(21%)of the sampled individuals had not smoked over the past six months.

For Exercises 1 to 4, identify the population, the parameter, the sample, and the statistic in each setting

Hot turkey Tom is cooking a large turkey breast for a holiday meal. He wants to be sure that the turkey is safe to eat, which requires a minimum internal temperature of 165掳F. Tom uses a thermometer to measure the temperature of the turkey meat at four randomly chosen points. The minimum reading in the sample is 170掳F
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