a) What is dependent and independent variables? b) Fully write out the regression equation. c) Fill in the missing values*, **', and d) Hence test whether & is significant. Give reasons for your
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d) Hence test whether ? is significant. Give reasons for your answer. [4]
- Exercise 2 Age B.P |(x) Age B.P (y) (y) |(x) 20 120 46 128 The following are the age (in years) and systolic blood pressure of 20 apparently healthy adults. 43 128 53 136 63 141 60 146 26 126 20 124 53 134 63 143 31 128 43 130 58 136 26 124 46 132 19 121 58 140 31 126 70 144 23 123Using the data below, determine the value of the slope B, in the linear regression line ŷ = B, + B1x. Give your answer to three decimal places. 2Ti = 1079, 4 = 1100, } = 67070 u? = 74908, C;Yi = 67546, n = 20A regression was run to determine if there is a relationship between hours of study per week (z) and the test scores (y)- The results of the regression were: y=ax+b a=5.701 b=31.89 r2=0.660969 r=0.813 Use this to predict the final exam score of a student who studies 3.5 hours per week, and please round your answer to a whole number. Question Help: Message instructor Submit Question rse here to search R
- What does the regression line represent?Use the scatterplot of Vehicle Registrations below to answer the questions Vehicle Registrations in the United States, 1925- 2011 Vehicles millions 300 y = 3.0161x - 5819.5 R² = 0.9695 250 200 150 100 50 1920 -50 1940 1960 1980 2000 2020 Year State the trend line (regression line). y= 3.0161 x -5819.5 year number of vehicle registrations R^2 = 0.9695 not enough information to determine Registrations (in millions)· Develop a simple linear regression equation for starting salaries using an independent variable that has the closest relationship with the salaries. Explain how you chose this variable.
- Does the Regression line give information about all the data points in the data set? Does the Regression line usually have all the points in the data set on it?Develop a multiple regression equation for starting salaries using School_Ranking, GPA, and Experience as independent variables. Is this regression equation "good for use"? Explain.Describe the correlation coefficient and explain how it is used in regression analysis?