2) During a 6 weeks period, a Quick Sell dealer kept a weekly record of the number x of TV ads versus the number y of cars sold. The result is given in the following table: 8. 2 15 12 18 Y 14 12 10 17 18 20 a) Draw a scatter-plot diagram. Remember to name the axes. b) Based on the scatter-plot diagram, would you estimate the correlation coefficient to be positive, close to zero, or negative? c) Use your calculator to find the coefficient of regression and the equation of best fit. Coefficient of Regression r Equation of the line of best fit

2) During a 6 weeks period, a Quick Sell dealer kept a weekly record of the number x of TV ads versus the number y of cars sold. The result is given in the following table: 8. 2 15 12 18 Y 14 12 10 17 18 20 a) Draw a scatter-plot diagram. Remember to name the axes. b) Based on the scatter-plot diagram, would you estimate the correlation coefficient to be positive, close to zero, or negative? c) Use your calculator to find the coefficient of regression and the equation of best fit. Coefficient of Regression r Equation of the line of best fit

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

An aerobic exercise instructor remembers the data given in the following table, which shows the recommended maximum exercise heart rates for individuals of the given ages. Age (x years) 20 30 40 50 60 Maximum heart rate 170 168 153 147 136 (y beats per minute) Find the linear correlation coefficient for the data.
Use a graphing calculator to create a scatter plot and find the line of best fit and the correlation coefficient for the following data. Round to the nearest hundredth. X 2 4 6 8124 10 Part: 0/2 y 2 3 6 7 10 15 19
Use the data in the table, which shows the average annual salaries (both in thousands of dollars) for public school principals and teachers in the U.S. for 11 years. Apply what you have learned in the previous tab to complete this graded lab questions. 1. Repeat the steps from tab #1 using this data to construct a scatter plot graph and calculate the correlation coefficient R. (Recall the corelation coefficient is R and not R Teachers y Principalsx 77.8 43.7 78.4 43.8 80.8 45.0 R= 80.5 45.6, 2. Does the R value represent a positive, negative or no correlation between the salaries ol the teachers and principals? As teacher salaries increase, what happens to prinicipal salaries? 10 11 81.5 45.9 84.8 48.2 12 13 87.7 49,3 3. Write the equation of the regression line for the data below. The equation is y= 14 91.6 51.3 52.9 Teachers y 15 16 95.7 54.4 COD 54.2 =D0.5873x-2.0s07o R=0.995, 17 95.7 4. Use the regression equation that you found in exercise #3 to predict the average annual salary…
The data below are the ages and annual pharmacy b ills (in dollars) of 9 randomly selected employees. Calculate the linear correlation coefficient.Age, x: 30, 33, 37, 40, 43, 45, 49, 53, 57Pharmacy bill ($), y: 119, 123, 126, 134, 145, 148, 151, 153, 155A. 0.890B. 0.908C. 0.998D. 0.960
Please help me answer the questions about correlation according to the graph. So would it be linear, strong, positive, or no association? Or negative and weak?
A manager wishes to determine the relationship between the number of years the manager's sales representatives have been with the company and their average monthly sales (in thousands of dollars). Calculate the linear correlation coefficient.Years with company, x: 6,7,14,11,12,19,7,5,15Sales, y: 21,23,68,52,55,51,38,45,110
a teacher asked her students how many hours of sleep they had the night before a test. what type of correlation does your graph show? Determine a equation line of best fit BY HAND using the points 7,90 nd 6,76. hours slept : 8 7 7 8 6 5 7 4 9 7 score 83 86 74 88 76 63 90 60 89 81
1. Create a histogram for the data for time spent studying. 2. Create a scatter plot to show the relationship of time spent studying and exams score. 1. Looking at the scatter plot, describe the relationship between the two variables, (identify the direction and magnitude)
Help
e7. Calculate coefficient of correlation for the following data by short-cut method: 54 58 62 66 68 70 72 58 44 64 52 65 72 81 y
A researcher is proposing that exercise makes a person more energized as a result they require less sleep. He carries out a survey on the number of hours of exercise per week and the average hours of sleep needed per night in order to feel well rested. The results are shown in the table (picture) for the 8 participants. a. Sketch a scatter plot for the data, is the relationship linear?b. What is the correlation between the two variables?c. Calculate the coefficient of determination and explain.
C. Amount of money spent 4. Construct a scatter plot for the following set of data. What correlation exists between the variables? Grade in calculus (x) and grade in entrepreneurship () 78 85 94 90 82 87 77 88 87 85 95 89 81 84 78 88 86 80