The table below shows the number of hours per day 11 patients suffered from headaches before and after 7 weeks of soft tissue therapy. At a 0.01, is there enough evidence to conclude that soft tissue therapy helps to reduce the length of timepatients suffer from headaches? Assume the samples are random and dependent, and the population is normally distributed. Complete parts (a) through ().PatientDally headache hours (before) 2.9 3.2 3.4 1.8 4.4 1.8 3.8 2.5 1.8 3.3 3.8Dally headache hours (after) 1.7 3.6 2.2 1.1 1.1 1.4 3.5 22 1.2 2.9 4.31 2 3 456 789 10 11 DOD. Ho: H20OE Ho He =dOF. Ho: Hyzd(b) Find the critical value(s) and identify the rejection region(s).6-2.764(Use a comma to separate answers as needed. Type an integer or a decimal. Round to three decimal places as needed.)Identify the rejection region(s). Choose the correct answer below.A. t>2.764O B. t< -2.764 or t> 2.764OC. t<-3.169 or t>3.169O D. t< -3.169(c) Calculate dd= 0.682(Type an integer or a decimal. Round to three decimal places as needed.)Calculate s(Type an integer or a decimal. Round to three decimal places as needed.)

Solution: Let x = Daily headache hours ( before) and y= Daily headache hours (after) Claim: The…

Answered: patients suffer from headaches? Assume…

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 increasing annual cost (including tuition, room, board, books, and fees) to attend college has been widely discussed.† The following random samples show the annual cost of attending private and public colleges. Data are in thousands of dollars. Private Colleges Public Colleges 53.8 43.2 46.0 32.3 44.0 20.3 22.0 28.2 15.6 24.1 28.5 30.6 44.8 36.8 50.5 43.0 22.8 25.8 18.5 25.6 14.4 21.8 (a) Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for private colleges. (Round the standard deviation to two decimal places.) sample mean $ thousand sample standard deviation 2$ thousand Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for public colleges. (Round the standard deviation to two decimal places.) sample mean %24 thousand sample standard deviation %$4 thousand
A consumer magazine wants to compare the lifetimes of ballpoint pens of three different brands (measured in days). The magazine takes a random sample of pens of each type in the following table. What is the correct test statistic? Brand 1 Brand 2 Brand 3 382 181 238 242 140 257 216 162 241 319 218 213 a. F (2, 9) = 5.54 b.r = -.34 c. t (11) = 12.16 d.p = .027
3. Can SAT scores predict college performance? Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation. A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58 The scatter diagram for the SAT score and GPA is given below: (a) Find the sample correlation coefficient r. Truncate to two decimal places. What does the value tell you about the data? (b) Find the equation of the least squares line . Truncate to four decimal places. What does the slope mean? (c) Find the value of the coefficient of determination . Truncate to two decimal places. What does this number mean? (d) What is the predicted GPA if a computer science major got a…
The owner of Maumee Ford-Volvo wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year. Car Age (years) Selling Price ($000) 1 11 12.1 2 8 10.5 3 14 5.7 4 17 4.9 5 9 5.0 6 8 13.4 7 10 10.5 8 14 9.0 9 13 9.0 10 17 4.5 11 6 12.5 12 6 11.5 Click here for the Excel Data Filea. Determine the regression equation. (Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.) a= b= Estimate the selling price of an 7-year-old car (in $000). (Round your answer to 3 decimal places.) Interpret the regression equation (in dollars). (Round your answer to the nearest dollar amount.)
3. Can SAT scores predict college performance? Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation. A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58 The scatter diagram for the SAT score and GPA is given below: (a) Find the sample correlation coefficient r. Truncate to two decimal places. What does the value tell you about the data? (b) Find the equation of the least squares line . Truncate to four decimal places. What does the slope mean? (c) Find the value of the coefficient of determination . Truncate to two decimal places. What does this number mean? (d) What is the predicted GPA if a computer science major got a…
1.) The Test Statistic for this data. ( Round answer to 3 decimal places). 2.) The p-value for this sample. (Round answer to 4 decimal places).
4.A college student is interested in whether there is a difference between male and female students in the amount of time they spend studying each week period the student gathers information from a random sample of male and female students on campus. The amount of time spent studying is normally distributed. The data are: Male Female 27 25 25 29 19 18 10 23 16 20 22 15 14 19 What statistical test should be done to analyze these data? Identify Ho and Ha for this study. Conduct the appropriate analysis. Should Ho be rejected? What should the researcher conclude? If significant, compute and interpret the effect size.
what is the nully hypothesis and alternative hypothesis
How many hours per week do gamers play video games? A simple random sample of 44 U.S. gamers age 13 or older are given below. 8.7 6.3 8.5 6.6 6.8 7.1 8.9 12.7 7 5.8 8 10.3 8.4 11.2 7.9 10.7 10.2 7.2 6.6 6.3 7.1 8.3 9.4 8.5 10.2 10.5 5.3 9.8 9.4 10.2 10.8 9.4 7.8 10.8 8.9 8.2 7.4 6.7 8.4 9.7 6.6 8.3 10.1 7.8 a.) Find a 92% confidence level for the population average time per week a gamer 13 or older plays video games. (Round answers to two decimal place.) margin of error: ? hr/wklower limit: ? hr/wkupper limit: ? hr/wk Interpret: We are (?)% confident that the population mean time per week a gamer 13 or older plays video games is between(?) hours and (?) hour .
Find the mean, the median, and all modes for the data in the given frequency distribution. (Round your answers to one decimal place. If there is more than one mode, enter your answer as a comma-separated list. If an answer does not exist, enter DNE.) mean median mode(s) Points Scored by Lynn Points scored in abasketball game Frequency 2 8 8 5 9 8 13 4 14 1 18 3 21 1

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