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The building specifications in a certain city require that the sewer pipe used in residential areas...

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Statistics

The building specifications in a certain city require that thesewer pipe used in residential areas have a mean breaking strengthof more than 2500 pounds per lineal foot. A manufacturer who wouldlike to supply the city with sewer pipe has submitted a bid andprovided the following information: An independent contractorrandomly selected seven sections of the manufacturer’s pipe andtested each for breaking strength. The results (pounds per linealfoot) are as follows: 2610, 2750, 2420, 2510, 2540, 2490, and2680.

1. What type of test should be conducted?

Dependent t test

Independent t test

One sample t test


2. State the null hypothesis in equation format.

3. State the alternative hypothesis in equation format.

4. What is the calculated t-value (to 3 significant digits)?

5. What is the critical t-value (to 3 significant digits)? Usealpha = 0.05.

6. Is the null hypothesis accepted or rejected? Use alpha =0.05.

7. Is there sufficient evidence to conclude that there is adifference between the mean rate of increase of total phosphorus ofthe control algal and the water hyacinth? Use alpha = 0.05. Explainin one sentence.

Answer & Explanation Solved by verified expert
3.7 Ratings (692 Votes)
Solution1 One sample ttest2State the hypotheses The first step is tostate the null hypothesis and an alternative hypothesisNull hypothesis u 2500Note that these hypotheses constitute a onetailed test Thenull    See Answer
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