Question 4 [25] The Zambezi car battery manufacturer claims that the average lifespan of batteries produced by...

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Question 4 [25]
The Zambezi car battery manufacturer claims that the averagelifespan of batteries produced by his firm is at least 30 months.The rival manufacture the Rehoboth batteries disagree and tookrandom sample of 100 Zambezi car batteries and recorded a mean of31.7 months and a standard deviation of 8 months. (Show all yourworks)
Determine the following:
a) The null and alternative hypotheses

b) The test statistic value.

c) The critical statistics value at 99% confidence level
d) The rejection region using critical value approach

e) The p value at 99% confidence level

f) The rejection region using both the p value approach

g) Make conclusion about the population mean using bothapproaches

Answer & Explanation Solved by verified expert

4.2 Ratings (869 Votes)

Ttest for OnePopulation MeanThe provided sample mean is Xbar317and the sample standard deviation is s 8and the sample size is n 1001 Null andAlternative HypothesesThe following null and alternative hypotheses need to betestedHo 30 the average lifespan of batteries produced by See Answer

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