Question

Hypothesis Testing:
1. A manufacturer of bicycle tires has developed a new design which he claims has an average lifespan of 5 years. A random sample of 150 tires showed a mean of 3.5 years with a standard deviation of 1.2 years. Test the claim at 5% level of significance.

2. A company which makes toy cars claims that its products have a mean life span of more than 5 years. Test the claim at 5% level of significance if a random sample of 28 toy cars was found to have a mean life span of 5.2 years with a standard deviation of 1.5 years.

Answer 1

Answer:

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Step-by-step explanation:

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