A production manager of a computer supplier company claims that circuit board Model C20-S produced by the company has a failure rate of 30% on a thermal cycling test. The thermalcycling test is known to cause failures in boards with weak circuit connections. Given that a97% confidence interval for the true percentage for the failure of circuit boards is(0.1814,0.2986).i)ii)Calculate the estimation error made in estimating the true percentage for the failure ofcircuit boards using the given confidence interval.€Use confidence interval approach to test the production manager's claim.

Answered: A production manager of a computer…

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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A shipment of 900 small lab mic arrives at the animal care facility with a nominal weight of 10 g per mouse. A sample of 30 mics is selected and weighed. The average weight of the sample is 13g. From past shipments, it is known that the standard deviation of weight among mic is 5 g. How many mics need to be sampled to ensure that the 95% confidence interval has a margin of error of 2?
Suppose that a random sample of 11 adult US males has a mean height is 69 inches with a standard deviation of 2.9 inches. If we assume that the height of adult males in the US are normally distributed, find a 90% confidence interval for the mean height of all US meals. Give the lower limb and upper limit of the 90% confidence interval. Carrier intermediate computations to at least three decimal places. Andrew answers to one decimal point.
A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure (in millimeters of mercury) for nine patients before taking the new drug and 22 hours after taking the drug are shown in the table below. Using this data, find the 90%90% confidence interval for the true difference in blood pressure for each patient after taking the new drug. Assume that the blood pressures are normally distributed for the population of patients both before and after taking the new drug. Patient 1 2 3 4 5 6 7 8 9 Blood pressure (before) 174174 176176 204204 180180 204204 189189 177177 181181 187187 Blood pressure (after) 166166 164164 194194 157157 178178 178178 156156 175175 178178 Step 2 of 4 : Calculate the sample standard deviation of the paired differences. Round your answer to six decimal places.
A researcher collected sample data for 14 women ages 18 to 24. The sample had a mean serum cholesterol level (measured in mg/100 mt) of 193, with a standard deviation of 7.5. Assuming that serum cholesterol levels for women ages 18 to 24 are normally distributed, find a 90% confidence interval for the man serum cholesterol level of all women in this age group. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decamal places. Round your answers to one deomal place.
a data set includes 109 body temperatures of healthy adult humans having a mean of 98.3 f and a standarddeviationn of 0.54F construct a 99% confidence interval estimate of the human body temperature of all healthy humans. What does the sample suggest about the use of 98.6 F as the mean body temperature?
In a sample of 26 participants, a researcher estimates the 90% CI for a sample with a mean of MD = 0.6 and an estimated standard error for the difference scores (SMD) of 1.1. What is the upper confidence limit for this interval?
A laboratory in Alaska is interested in finding the mean chloride level for a healthy resident in the state. A random sample of 90 healthy residents hasa mean chloride level of100 mEq/L. If it is known that the chloride levels in healthy individuals residing in Alaska have a standard deviation of 43 mEq/L, find a 90% confidence interval for the true mean chloride level of all healthy Alaska residents. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) What is the lower limit of the 90% confidence interval? What is the upper limit of the 90%confidence interval?
A pharmaceutical company claims that its new drug reduces systolic blood pressure. The systolic blood pressure (in millimeters of mercury) for nine patients before taking the new drug and 22 hours after taking the drug are shown in the table below. Using this data, find the 99%99% confidence interval for the true difference in blood pressure for each patient after taking the new drug. Assume that the blood pressures are normally distributed for the population of patients both before and after taking the new drug. Patient 1 2 3 4 5 6 7 8 9 Blood pressure (before) 189189 185185 180180 202202 171171 176176 158158 164164 199199 Blood pressure (after) 178178 176176 168168 196196 153153 156156 147147 144144 188188 Copy Data Step 1 of 4 : Find the point estimate for the population mean of the paired differences. Let x1x1 be the blood pressure before taking the new drug and x2x2 be the blood pressure after taking the new drug and use the formula d=x2−x1d=x2−x1 to calculate the…
A sample of 14 male college students consumes an average of 14.3 gallons of beer per month, with a sample standard deviation of 5.2 gallons. You can safely assume that the population of monthly beer consumption is Normally distributed. What is the margin of error for a 90% Confidence Interval for the mean? (Leave your answer to two decimal places, ex: 18.12)
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A laboratory in California is interested in finding the mean chloride level for a healthy resident in the state. A random sample of 70 healthy residents has a mean chloride level of 103 mEq/L. If it is known that the chloride levels in healthy individuals residing in California have a standard deviation of 44 mEq/L, find a 90% confidence interval for the true mean chloride level of all healthy California residents. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the lower limit of the 90% confidence interval? What is the upper limit of the 90% confidence interval?
A researcher collected sample data for 15 middle-aged women. The sample had a mean serum cholesterol level (measured in milligrams per one hundred milliliters) of 192.7, with a standard deviation of 6. Assuming that serum cholesterol levels for middle-aged women are normally distributed, find a 99% confidence interval for the mean serum cholesterol level of all women in this age group. Give the lower limit and upper limit of the 99% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: Upper limit: X Ś

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