s tests for the difference between two population meansA company that develops an automated customer service model is interested in knowing whether two versions,Version A and Version B, will get different ratings from customers. Participants in a focus group are taken throughsamples from both versions, then take a survey to rate each version. A summary of the data obtained from thestudy is given below. Assume ratings from the different surveys generally have the same standard deviation.Version A Version BMean33.13328.6715ObservationsPearson Correlation-0.325Hypothesized Mean Difference-1.426P(T

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Answered: A company that develops an automated…

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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Using the car data set below, describe the mpg variable and the effect that car type may have on that using the techniques learned in class. This means mean, median, standard deviation, 5 number summary, and boxplots. 1 2 3 4 5 6 7 large large large large large large large 11 large 12 large 13 large 14 midsize 15 midsize 16 midsize 17 midsize 18 midsize 19 midsize 20 midsize 8 9 type large 10 A price B 20.8 23.7 34.7 18.8 18.4 29.5 19.3 20.9 36.1 20.7 24.4 33.9 37.7 30 15.7 26.3 40.1 15.9 C mpg_city c D drive train 19 front 16 rear 16 front 17 rear 20 front 20 front 20 frant 18 rear 18 rear 19 front 19 front 18 front 19 front 22 rear 22 front 19 front 16 front 21 front E passengers 6 6 6 6 6 6 6 4 6 6 6 6 6 5 6 6 5 weight F 3470 4105 3620 3910 3515 3570 3490 3950 4055 3470 3495 3560 3405 3640 2880 3495 3935 3195
A company would like to know if efficiency can be improved through a training course for employees. A sample of employees is taken. The time taken for an employee to complete a task before training and after training is observed.
Repeated baseline measurements help improve the ____ of a single-subject study. A.Ecological validity B. Generalizability C. Internal validity D. Sample's representativeness
Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
A school principal claims that the number of students who are tardy to school does not vary from month to month. A survey over the school year produced the following results. Using a 0.10 level of significance, test a teacher’s claim that the number of tardy students does vary by month. Tardy Students Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May Number 17 10 7 18 11 17 8 7 19 19 Copy Data Step 3 of 4 : Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to three decimal places.
A company that develops an automated customer service model is interested in knowing whether two versions, Version A and Version B, will get different ratings from customers. Participants in a focus group are taken through samples from both versions, then take a survey to rate each version. A summary of the data obtained from the study is given below. Assume ratings from the different surveys generally have the same standard deviation. Mean Observations Pearson Correlation Hypothesized Mean Difference df t Stat P(T<=t) one-tail t Critical one-tail P(T<=t) two-tail t Critical two-tail Confidence Level Version A Version B 33.133 28.67 15 15 -0.325 0.00 14 n = Ex: 9 -1.426 0.088 -1.345 0.176 -1.761 95% Degrees of freedom: df Point estimate for Version A: XA = Ex: 1.234 Point estimate for Version B: x B = 1 = من t = −1 Ex: 1.234 0 1 t = P = = Ex: 1.234 2 3 2
At the .05 significance level, does the data below show significant correlation? x y 3 12.87 4 13.66 5 17.95 6 23.44 7 15.93 8 13.62 9 27.91
A sample contains 61 pairs of values. Find the critical value for the linear correlation coefficient from Table A-6 corresponding to a 0.05 significance level. A. 0.330 B. 0.236 C. 0.279 D. 0.254 ( don't hand writing solution)
C12. Using Monitoring the Future 2017 data, we examine whether a relationship exists between the race/ethnicity of a student and how the student rates the importance of being a community leader. IMPLDRCOMUNTY is measured on an ordinal scale: 1 = not important, 2 = somewhat important, 3 = quite important, and 4 = extra important. Analysis of variance results are presented. 1) Set alpha at .05. What do you conclude about the relationship between student race/ethnicity and the importance of being a community leader? 2) What is the eta square for this model? 3) If alpha were set at .01, would your decision change? Explain.

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