One of customer service department received the following number of calls during peaktime over 10 time periods:50, 47, 69, 55, 71, 77, 52, 63, 81, 64It is known that the standard deviation of the number of calls during peak time is 15.Estimate the mean of number of calls over peak time with 99% confidence level.A researcher claims that some particular bacteria with an average life span of 12 hourswill live to be about 20 hours when 25% of environment is more suitable for a longerlifespan. Is there any reason to believe that the mean is less than 21 if 31 bacteria thatare placed on this suitable environment have an average life of 18 hours with a standarddeviation of 4.8 hours? Use a 0.10 level of significance.

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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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Most medical schools of require applicants for admission to take the Medical College Admissions Test (MCAT) examination. Scores on the MCAT are roughly normally distributed with a mean of 500 and a standard deviation of 10.6. What percentage of students score above 518 points? (round to the nearest hundredth)
Suppose the mean height in inches of all 9th-grade students at one high school is estimated. the population's standard deviation is 3 inches. the heights of eight randomly selected students are, 74, 73 61,63,68,75,65 and 63. x̅ = ? margin of error at 90% confidence level = ? 90 percent confidence interval = ?_?
According to a leasing firm's reports, the mean number of miles driven annually in its leased cars is miles with a standard deviation of miles. The company recently starting using new contracts which require customers to have the cars serviced at their own expense. The company's owner believes the mean number of miles driven annually under the new contracts, , is less than miles. He takes a random sample of cars under the new contracts. The cars in the sample had a mean of annual miles driven. Assume that the population is normally distributed. Is there support for the claim, at the level of significance, that the population mean number of miles driven annually by cars under the new contracts, is less than miles? Assume that the population standard deviation of miles driven annually was not affected by the change to the contracts. Perform a one-tailed test. Then answer the questions below.Carry your intermediate computations to three or more decimal places, and round your responses…
Please give handwritten
I wanted to test if the mean Exam 3 score in this course was different than the mean Exam 2 score. To conduct this test I used the 30 students in my course last semester as my sample. I first calculated the difference in scores between Exam 2 and Exam 3 ("Exam 2 score - Exam 3 score"). The sample mean of these differences is 2.0 and the sample standard deviation of the differences is 3.0. What is your decision for this test? Group of answer choices 1. Reject the null hypothesis 2. Retain the null hypothesis
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A researcher believes that adolescents learn faster than elders. He gathered 30 adolescents and 23 elders for the test. He provided same instructional material that explains how to use Photoshop to retouch images and recorded the time that each participant took to finish their Photoshop task. The average time taken by the adolescents was 180 seconds with a standard deviation of 13 seconds. The mean time for elders was 279 seconds with a standard deviation of 25 seconds. A). Complete test statistic and critical values B). Conclusion
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10- Any number or quantity that can differ from one another is called: a. Sample b. Data c. Variable d. Population
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The Census Bureau reports that 82% of Americans over the age of 25 are high school graduates. A survey of randomly selected residents of certain county included 1100 who were over the age of 25, and 871 of them were high school graduates, (a) Find the mean and standard deviation for the number of high school graduates in groups of 1100 Americans over the age of 25. Mean = %3D Standard deviation = (b) Is that county result of 871 unusually high, or low, or neither? (Enter HIGH or LOW or NEITHER) Give your answers exactly, or to at least 4 decimal places.

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