Example 30 : In a study of an automobile insurance a random sample of 80repair costs had a mean of Rs.472.36 and a standard deviation of Rs.62.35. If x is used asbodypoint estimate to the true average repair costs, with what confidence we can assert that themaximum error does not exeed Rs.10?

Answered: Image /qna-images/answer/3f544531-3f82-4caa-8be3-6c390b190956.jpg

Answered: Example 30 : In a study of an…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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If a standard deviation is 1.4 away from a mean of 7.2 what is the z score of an x value of 10
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Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2600 grams and a standard deviation of 600 grams while babies born after a gestation period of 40 weeks have a mean weight of 2800 grams and a standard deviation of 390 grams. If a 32-week gestation period baby weighs 2150 grams and a 40-week gestation period baby weighs 2350 grams, find the corresponding z-scores. Which baby weighs less relative to the gestation period?
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In the year 2033, Sarai Patterson is a leading traveling nurse. Sarai is interested in reducing the mean recovery time for patients after experiencing a serious injury (assume recovery times are normally distributed). Suppose the mean recovery time is presently 8.6 months. Sarai takes a random sample of 46 patients that have experienced serious injury to participate in a new treatment program and finds the sample mean is 8.1 months and a sample standard deviation of 1.2 months. Using α = 0.05, answer the following questions. a) What is the setup for your null and alternative hypothesis? b) What is the value of the test statistic? c) What is/are the critical value(s)?
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Suppose that Melanie is a researcher who wishes to estimate the mean birthweight of full-term babies in her hospital. What is the minimum number of babies should she sample if she wishes to be at least 90% confident that the mean birthweight of the sample is within 225 grams of the the mean birthweight of all babies? Assume that the distribution of birthweights at her hospital is normal with a standard deviation of 600 g.

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Example 30 : In a study of an automobile insurance a random sample of 80 body repair costs had a mean of Rs.472.36 and a standard deviation of Rs.62.35. If x is used as point estimate to the true average repair costs, with what confidence we can assert that the maximum error does not exeed Rs.10?