A manufacturer makes steel rods that are supposed to have a mean length of 50 centimeters. A retailer suspects that the bars are being produced too short. A sample of 46 bars is taken and their mean length is determined to be 51 centimeters with a standard deviation of 3.6 centimeters. Using a .01 significance level, test the retailers claim that the population mean is less than 50 centimeters. 1. State the null hypothesis H0: 2. State the alternative hypothesis H1:  3. What is the test statistic used for the test (z or t) and it’s value (round to 2 places) 4. State the significance or alpha (α) level 5. Determine the p-value. (round to 4 places) 6. Do you or do you not reject the null hypothesis? Why?

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A manufacturer makes steel rods that are supposed to have a mean length of 50 centimeters. A retailer suspects that the bars are being produced too short. A sample of 46 bars is taken and their mean length is determined to be 51 centimeters with a standard deviation of 3.6 centimeters. Using a .01 significance level, test the retailers claim that the population mean is less than 50 centimeters.

1. State the null hypothesis H0:

2. State the alternative hypothesis H1: 

3. What is the test statistic used for the test (z or t) and it’s value (round to 2 places)

4. State the significance or alpha (α) level

5. Determine the p-value. (round to 4 places)

6. Do you or do you not reject the null hypothesis? Why?

 

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