Question: Practice Test 3 ~ Ch 8 - 9 Dionne V Question 2 of 33 (6 points) | Question Attempt: 1 of 1 Espanol = 1

Practice Test 3 ~ Ch 8 - 9 Dionne V Question 2 of 33 (6 points) | Question Attempt: 1 of 1 Espanol = 1 = 2 5 6 7 8 9 10 11 The lifetime of a certain type of battery is known to be normally distributed with standard deviation o =24 hours. A sample of 50 batteries had a mean lifetime of 120.1 hours. It is desired to construct a 95% confidence interval for the mean lifetime for this type of battery. Part: 0 / 6 Part 1 of 6 old (a) What is the point estimate? The point estimate is |120.1 . X Part: 1 / 6 Part 2 of 6 (b) Find the critical value. The critical value is |1.96 . 5 X Part: 2 / 6 Part 3 of 6 (c) Find the standard error. Round to four decimal places. The standard error is. X Next Part Submit Assignment every ItWIMW/ Hill. Terms of Use | Privacy Center | Accessibility

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