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A company which produces AA batteries tests lifetime of random sample of 40 batteries using special device designed to imitate real-world use. Based on testing, company makes following statement: "Our batteries last the average of 430 to 470 minutes, and our confidence in that interval is 95%" Find out standard deviation and show work.
The second plane's speed is also normally distributed with mean and standard deviation 500and 10,respectively. What is the probability that plane 2 did not catch up to plane o
A simple random sample of 100 of a certain popular model car in 2003 found that 20 had a certain minor defect in the brakes. A simple random sample of 400 of this model car
The time needed for college students to complete a certain paper-and-pencil maze follows a Normal distribution, with a mean of 70 seconds and a standard deviation of 15 seco
Generalizing the solution of Example 9.2, let the call duration T be an exponential (λ) random variable. For t0 > 0, show that the minimum mean square error estimate of T, giv
You have $380,000 in your bank account. The interest rate in your account is 5%. Solve for the following showing your work: How much interest will you accumulate if interest i
The mean was 56 and the standard deviation was 20. On the second exam, she scored 82; the mean was 74 and the standard deviation was 5. On which exam did she do better?
Assume that the standard deviation s is known to be $5.50. Using a 0.05 level of significance, would we conclude the typical amount spent per customer is more than $20.00?
For all subsequent parts state the null and alternative hypothesis, write down the test statistics and their degrees of freedom, calculate the test statistics, find the p-va
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