Twelve different video games showing substance use were observed and the duration of times of game play (in seconds) are listed below. The design of the study justifies the assumption that thesample can be treated as a simple random sample. Use the sample data to construct a 98% confidence interval estimate of o, the standard deviation of the duration times of game play. Assume thatthis sample was obtained from a population with a normal distribution.4,8434,158Click the icon to view the table of Chi-Square critical values.4,8614,4804,6304,7514,3104,2614,2443,822The confidence interval estimate is sec<

Let be the population standard deviation of the duration times of gameplay.Given that,Sample size…

Answered: he confidence interval estimate is sec<

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 standard deviation of test scores on a certain achievement test is 10.9 A random sample of 100 scores on this test had a mean of 74.8 Based on this sample, find a 95% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. Lower limit: Upper limit:
Find the critical T value that corresponds to 98% confidence. Assume 25° of freedom (Round to 3 decimal places if needed)
The standard deviation of test scores on a certain achievement test is 11.4. A random sample of 80 scores on this test had a mean of 72.5. Based on this sample, find a 90% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. 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: I Upper limit:
The standard deviation of test scores on a certain achievement test is 11.4. A random sample of 80 scores on this test had a mean of 74.7. Based on this sample, find a 90% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. 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:
A recent study of 9,226 Queensland high school teachers found that 7,372 of them worked longer than the average school day. Use the survey results to estimate, with 92% confidence, the proportion of Queensland high school teachers who worked longer than the average school day. Report the upper bound of the interval only, giving your answer as a percentage to two decimal places.
The distribution of scores on a standardized aptitude test is approximately normal with mean of 480 and a standard deviation of 100. What is the minimum score needed to be in the top 15% on this test? Carry your intermediate computations to at least four decimal places, and round your answer to the nearest integer. 0 X Ś ?
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 53 hours. Suppose that a random sample of 50 bulbs of this brand has a mean of 495 hours. Find a 99% confidence interval for the true mean lifetime of all light bulbs of this brand. Then give the lower and upper limit. Carry intermediate computations to 3 decimal places, and answers to 1.
An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation of 8. A psychologist gave the self-esteem test to a random sample of 60 individuals, and their mean score was 66 Construct a 95% confidence interval for the true mean of all test scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
Please solve part d and e. A radioactive mass emits particles according to a Poisson process at a mean rate of 4 per second. Let T be the waiting time, in seconds, between emissions.a.What is the mean waiting time? b.What is the median waiting time? c.Find P(T > 2). d.Find P(0.3 < T < 1.5). e.If 3 seconds have elapsed with no emission, what is the probability that there will be an emission within the next 2 seconds?
The standard deviation of test scores on a certain achievement test is 11.5. A random sample of 70 scores on this test had a mean of 75.3. Based on this sample, find a 99% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
Find the critical T value that corresponds to 98% confidence. Assume 25° of freedom
The standard deviation of test scores on a certain achievement test is 11.3. A random sample of 150 scores on this test had a mean of 71.2. Based on this sample, find a 99% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. Lower limit: Upper limit

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