The mean lifetime of colour television circuit boards (in months) produced by Firms A and Bare to be compared. The sample of 20 circuit boards is randomly assigned to each firm. Both.populations have a normal distribution. The summary statistics are presented in the table below.Sample Mean LifetimeCircuit Hoard (month )Population StandardDcviallon (months)FirmA4.50.38B2.90.481. Which firm do you prefer according to the table above? Why?2. Construct and interpret a 99% confidence interval for the difference of two populationmeans.3. Does tbe data indicate that the effectiveness offirm A's circuit board is different fromfirm B? Test at 1% level of significance.4. Isyour result in confidence interval consistent with your result in hypothesis testing? Stalethe reason.

Here AS PER POLICY I HAVE TO CALCULATE 3 SUBPART EVEN THOUGH I HAVE CALCULATED ALLL

Answered: 1. Which firm do you prefer according…

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 newspaper reported that 80% of people say that some coffee shops are overpriced. The source of this information was a telephone survey of 100 adults. a. Identify the population of interest in this study. b. Identify the sample for the study. c. Identify the parameter of interest in the study. d. Find and interpret a 90% confidence interval for the parameter of interest. a. Identify the population of interest. Choose the correct answer below. coffee shops a telephone survey 80% of adults newspapers 100 adults adults b. Identify the sample. Choose the correct answer below. adults a telephone survey 100 adults 80% of adults newspapers coffee shops c. Identify the parameter of interest. Choose the correct answer below. A. p, the population proportion of adults who say that some coffee shops are overpriced B. o, the population variance of adults who say that some coffee shops are overpriced С. p, the sample proportion of adults who say that some coffee shops are overpriced D. X, the…
PROBLEM: A psychologist asks a random sample of 30 female adolescents and a separate, random sample of 30 male adolescents how much time they spend communicating with others online on an average day. She compares the time spent communicating online of female adolescents with that of male adolescents. In your project include: The problem and data. Calculate and interpret the correct 90% confidence interval for the mean difference in the two groups average time spent communicating online. (Use the 4 steps) Preform the correct significance test to test the claim that females spend more time than males communicating online. Use a level of significance of 0.05 and then use a level of significance of 0.10. Explain your results for each alpha. (Use the 4 steps) Answer the initial question and explain how you should use the confidence interval AND significance test to answer it. Review the rubric to make sure you include all necessary components. 1. Data: Hours…
You have these questions on your website, and you have the answer for 95%, please compute a 98% confidence interval. Only compute a 98% confidence interval. Cost to Repair Fire Damage, The mean cost to repair the smoke and fire damage that results from home fires of all causes is $11,389 (HomeAdvisor). How does the damage that results from home fires caused by careless use of tobacco compare? The file TobaccoFires provides the cost to repair smoke and fire damage associated with a sample of 55 fires caused by careless use of tobacco products. Using past years’ data, the population standard deviation can be assumed known with cr = $3027. What is the 95% confidence interval estimate of the mean cost to repair smoke and fire damage that results from home fires caused by careless use of tobacco? compute also a 98% confidence interval.
A fast food company has decided to open a store in a city if more than 70% of the inhabitants eat out more than 3 times each week. The company polls 50 families and finds that 68% of them each out more than 3 times each week. Using 90% confidence level, answer the following questions. 2. Find the test statistic (round to two decimal places).
9. A researcher wants to construct a 99% confidence interval for the proportion of Americans who think that the U.S. invading Iraq was an effective step in combating world terrorism. She has no initial idea of what that proportion is. How large should her sample size be if she wants the margin of error to be at most two percent? Show or explain your thinking.
Create a 99.8% confidence interval for the true proportion of all MDS patients on this treatment who will develop leukemia within 5 years of MDS diagnosis. 1. What is the 99.8% confidence interval? 2. What is the correct interpretation of the confidence interval from question 1? 3. Are the assumptions met? Explain. Conduct a hypothesis test at the 0.05 significance level to test this claim. 4. What are the hypotheses? 5. What is the significance level? A. 0.01 B. 0.04 C. 0.05 D. 0.10 6. What is the value of the test statistic? 7. What is the p-value? 8. What is the correct decision? A. Reject the Null Hypothesis B. Fail to Reject the Null Hypothesis C. Accept the Null Hypothesis D. Accept the Alternative Hypothesis 9. What is the appropriate conclusion/interpretation? 10. Are the assumptions met? Explain.
A genetic experiment with peas resulted in one sample of offspring that consisted of 425 green peas in a 162 yellow peas. a. Construct a 95% confidence interval to estimate of the percentage of yellow peas. b. it was expected at 25% of the offspring peas would be yellow. Given the percentage of offspring yellow peas is not 25%, do the results contradict expectations?
in a poll, 73% of California adults (367 out of 506 surveyed) believe that education is one of the main issues facing California. We want to construct a 90% confidence interval for the true proportion of California adults who believe that education is one of the main issues facing California.- I need help with finding a 90% confidence interval for the population proportion (I also have to round the answer to three decimal places)
A genetic experiment with peas resulted in one sample of offspring that consisted of 448 green peas and 171 yellow peas. a. Construct a 95% confidence interval to estimate of the percentage of yellow peas. b. It was expected that 25% of the offspring peas would be yellow. Given that the percentage of offspring yellow peas is not 25%, do the results contradict expectations? Express the percentages in decimal form.
A sample of 20 managers was taken, and they were asked whether or not they usually take work from home. The responses of these managers given below, where yes indicates they usually take work home and no means they do not yes yes no no no yes no no no no yes yes no yes yes no no no no yes Find a 95% confidence interval for the percentage of all managers who take work from home. Interpret confidence interval. How large sample is required if we want to be 95% confident that our estimate of p is within 0.02?

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