2. A factory manufacturing light-emitting diode (LED) bulbs claims that their lightbulb last for 50 000 hours on the average. To confirm its this claim is valid, aquality control manager got a sample of 50 LED bulbs and obtained a life spanof 40 000 hours. The standard deviation of the manufacturing process is 1 000hours. Do you think the claim of the manufacturer is valid at the 5% level ofsignificance?

Answered: Image /qna-images/answer/b3542e33-0f28-4944-82ca-2120044ec959.jpg

Answered: 2. A factory manufacturing…

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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The breaking strengths of cables produced by a certain manufacturer have historically had a mean of 1800 pounds and a standard deviation of 95 pounds. The company believes that, due to an improvement in the manufacturing process, the mean breaking strength, μ, of the cables is now greater than 1800 pounds. To see if this is the case, 70 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1829 pounds. Can we support, at the 0.10 level of significance, the claim that the population mean breaking strength of the newly-manufactured cables is greater than 1800 pounds? Assume that the population standard deviation has not changed. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. a. State the null hypothesis H0 and the alternative hypothesis H1. b. Find the value of the test statistic. Round to three or more decimal…
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 20.8 minutes. Assume the standard deviation is a=8.0 minutes. Suppose that a simple random sample of 107 visits was selected this year and has a sample mean ofx18.8 minutes. A social scientist is interestec to know whether the mean time of Facebook visits has decreased. Use the a =0.10 level of significance and the critical value method with the table. (a) State the appropriate null and alternate hypotheses. (b) Compute the value of the test statistic. (c) State a conclusion. Use the u =0.10 level of significance. Part: 0/5 Part 1 of 5 (a) State the null and alternate hypotheses. D-0 This hypothesis test is a (Choose one) v test. noht-talled
The products that a company is exporting in the United States have an average of 3 weeks lead time and a standard deviation of 0.5 week. Seven products are measured and assumed to be normally distributed, what percentage of the products have shorter lead time than 2.8 weeks?
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The visibility standard index (VSI) is a measure of Denver air pollution that is reported each dayto theDenver Post. The index ranges from 0 (excellent air quality) to 200 (very bad air quality).During the winter months, when air pollution is higher, the index has a mean of about 90 (rated as fair) with a standard deviation of approximately 30. Suppose that for 15 days (during the winter), the following VSI measures were recorded each day. Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 VSI 80 115 100 90 15 10 53 75 80 110 165 160 120 140 195 a) Make a control chart for the VSI, and plot the above data on the control chart. Besure to include the horizontal lines on the control chart b) identify all out-of-control signals (above or below the mean) that you find in the control chart by type (Type I, II, or III)
Q2: Serum amylase determinations were made on a sample of 15 apparently healthy subjects in the Electricity Power Plant of Nasriya January 2010. The sample yielded a mean of 96 and a standard deviation of 35 units/100ml. Estimate the true mean of serum amylase in the healthy population of Nasriya.
The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 45 and a standard deviation of 10. Using the empirical rule (as presented in the book), what is the approximate percentage of lightbulb replacement requests numbering between 15 and 45? Do not enter the percent symbol. ans = Submit Question Type here to search ? 米 esc IOI 10 144 @ 2$ 4. | % 2 7 8. Q W tab R T A S caps lock %23
Assume that an internet provider monitors the amount of time that every customer accesses their home internet connection each day. The amount of time that all of their customers access their home internet connection is normally distributed. They access it for an average of 8.9 hours per day with a standard deviation of 2.1 hours. What proportion of samples of 100 will spend less than an average of 9 hours on their home internet per day? Your answer should have 4 decimal places.
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