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Chapter 8: Q.34 (page 479)

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

Short Answer

Expert verified

Given in the question that a graph, we have to fill the blanks on the graph with appropriate answers.

Step by step solution

01

Given Information

Given in the question that a graph, we have to fill the blanks on the graph with appropriate answers.

02

Calculation

According to the information, the confidence level is 95%

Therefore, the CL=0.95

The area under each tail is 0.025. So a2=0.025

The sample mean is 30.4.

Hence, x¯=30.4

The 95%confidence interval is [24.52,36.28]

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Most popular questions from this chapter

The mean age for all Foothill College students for a recent Fall term was 33.2. The population standard deviation has been pretty consistent at 15. Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was 30.4. We are interested in the true mean age for Winter Foothill College students. Let X=the age of a Winter Foothill College student.

role="math" localid="1648389122287" n=____

Construct a 99%confidence interval for the population mean hours spent watching television per month.

(a) State the confidence interval

(b) sketch the graph, and

(c) calculate the error bound.

The data in the Table are the result of a random survey of 39national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let X=the number of colors on a national flag.

xFreq.11273184756

Calculate the following:

(a) x¯=_____

(b) sx=_____

(c) n=_____

In words, define the random variables X andX¯.

The data in Table 8.10 are the result of a random survey of 39 national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let X = the number of colors on a national flag.

Construct a 95% confidence interval for the true mean number of colors on national flags.

Using the same x¯ , sx , and n = 39, how would the error bound change if the confidence level were reduced to 90%? Why?
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