Worker1 Worker2 Worker314.841IT Help Desk Questions226.5710.083.24.8918.3219.61The IT Help Desk supervisor from the last homework is analyzingthe data collected about the mean time it takes for each Help Deskworker to solve a walk-in problem.418.812.9512.8221.8720.2118.5225.2820.5717.35718.7514.815.5The supervisor believes that most walk-in problems would take atleast 5 minutes but should be solved in less than 30 minutes. On8.23.8218.3313.399.27.3425.7719.46average, student workers should take only 15 minutes to solve anywalk-in problem or decide to refer the customer to a senior IT HelpDesk employee.1021.0613.5716.081124.4816.5218.511226.921.1214.37The file ITtimes.csv contains data recorded times for three1327.7817.7719.87different student workers. For each worker, 25 walk-ins wererandomly selected from last month's working hours. Remember,most statistical methods require a random sample from thepopulation of interest.1417.415.413.851526.5513.9113.51624.8315.8115.661724.2712.6913.411822.6213.2816.441918.8117.44172023.522.539.432123.1218.9117.032227.3419.5115.772318.1814.8214.92420.9416.7418.122521.1317.4820.432621.0113.5716.26 For worker 2, find the value of the test statistic to test theresearch hypothesis that the student is taking, in average, morethan 15 minutes to solve walk-in problems. (Use four digits afterthe decimal point, e.g., 0.1234)Hint: R command t.test() could be useful,

The data shows the students taking the time to solve walk-in problems.

Answered: For worker 2, find the value of the…

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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Q.1 Dr. Star is interested in whether the physical coordination skills among low-income pre-school children are different from those of other children. She knows the population mean for the Pre- School Coordination Activity Test (PCAT) is 120 with o x= 10. She tests 80 preschoolers from low-income families and obtains an X= 122. a. Should Dr. Star do a one-tailed or a two-tailed test? Explain your answer. b. State the appropriate H o and H a , given your answer in part a. c. Use at a = 0.05. What is the value of zcrit ? d. Calculate z obt e. Using symbols, report your findings. f. What should Dr. Star conclude?
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A researcher thinks that watching violent televisions increases aggressive behavior in children. To test this hypothesis, she randomly assigns 48 children into one of 3 groups (no violent TV, a little violent TV, or a lot of violent TV) and observes their playground behavior for three weeks and measures it for violence and intensity. For the variable “amount of TV” (as it appears in this problem), what is the scale of measurement? a. nominal b. ordinal c. interval d. ratio A researcher thinks that watching violent televisions increases aggressive behavior in children. To test this hypothesis, she randomly assigns 48 children into one of 3 groups (no violent TV, a little violent TV, or a lot of violent TV) and observes their playground behavior for three weeks and measures it for violence and intensity. If the researcher’s hypothesis is correct, which of the following conclusions could be drawn? a. Fail to reject the null, watching violent TV does not increase…

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For worker 2, find the value of the test statistic to test the research hypothesis that the student is taking, in average, more than 15 minutes to solve walk-in problems. (Use four digits after the decimal point, e.g., 0.1234) Hint: R command t.test() could be useful.