Question

A tire manufacturer wishes to investigate the tread life of its tires. A sample of 10 tires driven 50,000 miles revealed a sample mean of 0.32 inch of tread remaining with a standard deviation of 0.09 inch. Would it be reasonable for the manufacturer to conclude that after 50,000 miles the population mean amount of tread remaining is 0.30 inches? Use ? = 0.05. Hypotheses: Null Hypothesis (H0): The population mean amount of tread remaining after 50,000 miles is 0.30 inches. Alternative Hypothesis (Ha): The population mean amount of tread remaining after 50,000 miles is not 0.30 inches. Type of test: Two-tailed test Test Statistic: t-test p-value: Decision: Conclusion:

          A tire manufacturer wishes to investigate the tread life of its tires. A sample of 10 tires driven 50,000 miles revealed a sample mean of 0.32 inch of tread remaining with a standard deviation of 0.09 inch. Would it be reasonable for the manufacturer to conclude that after 50,000 miles the population mean amount of tread remaining is 0.30 inches? Use ? = 0.05.

Hypotheses:
Null Hypothesis (H0): The population mean amount of tread remaining after 50,000 miles is 0.30 inches.
Alternative Hypothesis (Ha): The population mean amount of tread remaining after 50,000 miles is not 0.30 inches.

Type of test: Two-tailed test

Test Statistic: t-test

p-value:

Decision:

Conclusion:

A tire manufacturer wishes to investigate the tread life of its tires. A sample of 10 tires driven 50,000 miles revealed a sample mean of 0.32 inch of tread remaining with a standard deviation of 0.09 inch. Would it be reasonable for the manufacturer to conclude that after 50,000 miles the population mean amount of tread remaining is 0.30 inches? Use ? = 0.05.

Hypotheses:
Null Hypothesis (H0): The population mean amount of tread remaining after 50,000 miles is 0.30 inches.
Alternative Hypothesis (Ha): The population mean amount of tread remaining after 50,000 miles is not 0.30 inches.

Type of test: Two-tailed test

Test Statistic: t-test

p-value:

Decision:

Conclusion:

Added by Patricia A.

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