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Chapter 8: Q.42 (page 479)

Explain in complete sentences what the confidence interval means.

Short Answer

Expert verified

A confidence interval is a kind of interval estimate of a population parameter

Step by step solution

01

Given information

Given in the question that, A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to be examined. An investigation committee randomly surveyed70patients. The sample mean was 1.5hours with a sample standard deviation of0.5 hours.

02

Explanation

A confidence interval is a kind of interval estimate of a population parameter. It can be interpreted as, with 95% confidence it can be expressed that the population means time spent waiting is between 1.38 hours to1.62 hours.

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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.

___=15.

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a.i.x虅=__________ii.sx=__________iii.n=__________iv.n鈥�1=__________

b. Define the random variable Xin words.

c. Define the random variable Xin words.

d. Which distribution should you use for this problem? Explain your choice.

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ii. Sketch the graph.

iii. Calculate the error bound.

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b. sx =_______

c. n =_______

d. n 鈥� 1 =_______

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