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A randomly selected sample of 32 individuals reported that their smartphone stopped working after an average...

A randomly selected sample of 32 individuals reported that their smartphone stopped working after an average of 4.2 years. Assume that we know the population standard deviation of smartphone life expectancy is 1.2 years. Test the claim that the average smartphone life expectancy is less than 4.7 years (the average based on past studies). Use a 0.01 significance level.

1) State the Null Hypothesis, Alternate Hypothesis, type of test & level of significance (2 pts)

2)    Check the conditions. (2 pts)

3)    Compute the sample test statistic. Then find the P-value. (16 pts)

4) Decide whether to REJECT or FAIL TO REJECT the Null Hypothesis. Explain your answer. (2 pts)

5)    Interpret the conclusion. (2 pts)

math   Statistics-And-Probability   
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