Answer Happy

Suppose a lifetime of randomly chosen A/C unit of certain brand is modeled by Exponential random variable. We are wondering if this is an evidence that true mean lifetime of this A/C unit is below 4 years. We are planning to perform the hypothesis test with n=10 and significance level of 5%. Before we go out and collect data, we want to see if this set up will reject the null hypothesis with enough probability when mu, the true average lifetime of A/C units, is actually 3.5. Assume true SD is . 8. (Use %, and round to nearest whole number. e.g. 35%) Your Answer: Answer units