homework 4 - WordMailingsReviewViewO Tell me what you want to do...AaBbCcDc AaBbCcDc AaBbC AABBCCC AaB AaBbCcC AaBbCcD AaBbCcD AaBbCcD AaBbCeI Normal T No Spac. Heading 1 Heading 2Subtītle Subtle Em.. Emphasis Intense E.TitleSuoisParagraphStyles4.6.From Cohen:Chapter 4a q.11 (p. 114);Chapter 4b, q. 6a, b. (p. 128).Also, solve the following.Babcock and Marks (2010) reviewed survey data from2003-2005, and obtained an average of u = 14 hoursper week spent studying by full-time students at 4-yearcolleges in the United States. To determine whether thisaverage has changed in the past 10 years, researcherselected a sample of n = 64 of today's college studentsand obtained an average of M = 12.5 hours. If thestandard deviation for the distribution is o = 4.8%3DI%3D%3Dhours per week, does this sample indicate a significantchange in the number of hours spent studying? Use atwo-tailed test with a = .05.82°F Partly sunny ^ galHP All-in-OneREDESIGNED. RELIABLE.READY FOR YOUNew, colorful ripplepattern

given n=64, M=12.5, mu=14, sigma=4.8, alpha=0.05

Answered: Babcock and Marks (2010) reviewed…

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 mean federal income tax paid last year by a random sample of 45 persons selected from a city was $4,211. Suppose the standard deviation of tax paid in this city is $734. The 95% confidence intervel for the population mean (rounded to two decimal places) is:
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In a study entitled How Undergraduate Students Use Credit Cards, Sallie Mae reported that undergraduate students have a mean credit card balance of $3,173. This figure was an all-time high and had increased 44% over the previous five years. Assume that a current study is being conducted to determine whether it can be concluded that the mean credit card balance for undergraduate students has continued to increase compared to the April 2009 report. Based on previous studies, use a population standard deviation σ = $1,000.For a sample of 180 undergraduate students with a sample mean credit card balance of $3,325, using a 0.05 level of significance, what is your conclusion?
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Suppose that an independent research company was tasked with testing the validity of complaints against a pesticide manufacturing firm for under-filling their 20 lb bags of pesticide. Past experience has shown that the amount of pesticide dispensed by the machines that fill the bags follows a normal distribution with a mean of 20 lb and a standard deviation of 0.6 lb. To verify the validity of the complaints, a researcher randomly selected 16 of the firm's 20 lb pesticide bags and recorded the following weights. 19.69, 19.5, 18.85, 18.56, 20.23, 20.3, 20.14, 19.11, 19.65, 18.87, 19.22, 19.24, 18.82, 20.23, 20.46, 18.66 If you wish, you may download the data in your preferred format. CrunchIt! CSV Excel JMP Mac Text Minitab PC Text R SPSS TI Calc The mean weight of the 16 bags collected was 19.471 lb. Calculate the value of the one-sample z- statistic. Give your answer precise to three decimal places.
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A course has a midterm (average 70; standard deviation 10) and a really hard final (average 50; standard deviation 12) If the scatter diagram comparing midterm & final scores for students has an oval shape with correlation 0.75, then... What do you expect the average final score would be for students who scored 75 on the midterm?
In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-shaped and has a mean of 50 and a standard deviation of 10. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 30 and 70?ans = %
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