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Chapter 8: Q.90 (page 483)

Fill in the blanks on the graph with the areas, upper and lower limits of the confidence interval, and the sample

proportion.

Short Answer

Expert verified

on the graph with the areas, upper and lower limits of the confidence interval, and the sample

proportion.

Step by step solution

01

Given Information

on the graph with the areas, upper and lower limits of the confidence interval, and the sample

proportion.

02

Calculation

The 92% confidence level is CL = 0.92

The area under each tail is a/2 = 0.04

The 92 percent confidence interval is calculated as follows: (0.7217,0.8783)

The sample fraction of girls aged 8 to 12 at the start of ice skating instruction at the ice chalet at 0.8

p' = 0.8

03

Explanation

The values are then entered into the supplied figure blank.

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Most popular questions from this chapter

Why would the error bound change if the confidence level were lowered to95%?

A sample of 20heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2pounds with a standard deviation of 0.1pounds. The population standard deviation is known to be 0.2pounds.

Identify the following:

a. x¯=

b. σ=

C. n=

If the Census did another survey, kept the error bound the same, and surveyed only 50 people instead of 200, what would happen to the level of confidence? Why?

You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of sleep subjects get each night. You measure hours of sleep for 12subjects with the following results. Construct a 95% confidence interval for the mean number of hours slept for the population (assumed normal) from which you took the data. 8.2; 9.1; 7.7; 8.6; 6.9; 11.2; 10.1; 9.9; 8.9; 9.2; 7.5; 10.5

What will happen to the confidence interval obtained, if 500 newborn elephants are weighed instead of 50? Why ?
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