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Chapter 8: Q 76. (page 542)

A school of fish Refer to Exercise 74.

a. Explain why it was necessary to inspect a graph of the sample data when checking the Normal/Large Sample condition.

b. According to the packaging, there are supposed to be 330goldfish in each bag of crackers. Based on the interval, is there convincing evidence that the average number of goldfish is less than 330? Explain your answer.

Short Answer

Expert verified

a. This because sample size is small.

b. No evidence is present that average number of goldfish is less than330

Step by step solution

01

Given Information

Given data is:317,330,325,323,332,337,324,342,330,349,335,330

02

Necessity of inspecting graph

Sample data consists of 12<30values. To make sure that normal/large condition is satisfied, inspecting graph of sample data is important.

03

Checking if there is evidence that average goldfish is <330

Output using excel is:

Required confidence interval is 325.596<渭<336.738.

The upper limit is higher than 330.

There is no evidence that average goldfish is less than330

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