A liquor wholesaler is interested in assessing the effect of the price of a premium scotch whiskey on the quantity sold.The results in the accompanying table on price, in dollars, and sales, in cases, were obtained from a sample of 8 weeksof sales records.19.220.8PriceSales25.111.4a. Estimate by least squares the linear regression of increase in sales on increase in price.b. Find a 95% confidence interval for the slope of the population regression line.Click to view the table of critical values of the Student's t distribution.a.y₁ +20.314.3=19.818.5X₁(Round to three decimal places as needed.)21.311.319.815.517.729.717.135.4

The question is about regression Given : To find : a ) Reg. eq. b ) 95 % CI for slope

Answered: A liquor wholesaler is interested in…

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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Use the given data to find the equation of the regression line. Examine the scatterplot and identify a characteristic of the data that is ignored by the regression line. 11 12 11 13 6 4 11 8 y 7.73 7.04 12.52 6.81 7.95 8.77 6.19 5.58 8.39 6.34 5.45 Create a scatterplot of the data. Choose the correct graph below. OB. O B. OD Ay 25 20 Ay 25- 25 20 20- 20 15 15 15 10 15- 10 10 10 5 55 0- 05 10 15 20 25 0- 05 10 15 20 25 05 10 15 20 25 05 10 15 20 25 Find the equation of the regression line. (Round the constant two decimal places as needed. Round the coefficient to three decimal places as needed.)
Please show all the steps without using any software
Find the regression equation, letting overhead width be the predictor (x) variable. Find the best predicted weight of a seal if the overhead width measured from a photograph is 2 cm. Can the prediction be correct? What is wrong with predicting the weight in this case? Use a significance level of 0.05. Overhead Width (cm) 7.9 8.4 9.7 7.4 9.6 7.1 Weight (kg) 162 214 263 140 254 155 Click the icon to view the critical values of the Pearson correlation coefficient r. The regression equation is y = + x. (Round to one decimal place as needed.) The best predicted weight for an overhead width of 2 cm is kg. (Round to one decimal place as needed.) Can the prediction be correct? What is wrong with predicting the weight in this case? O A. The prediction cannot be correct because a negative weight does not make sense. The width in this case is beyond the scope of the available sample data. O B. The prediction cannot be correct because there is not sufficient evidence of a linear correlation. The…
The equation of a regression line, unlike the correlation, depends on the units we use to measure the explanatory and response variables. Here is the data on percent body fat and preferred amount of salt. Preferred amountof salt x 0.2 0.3 0.4 0.5 0.6 0.8 1.1 Percent body fat y 21 30 23 30 39 24 31 In calculating the preferred amount of salt, the weight of the salt was in milligrams. (a) Find the equation of the regression line for predicting percent body fat from preferred amount of salt when weight is in milligrams. (Round your answers to one decimal place.) ŷ = + x (b) A mad scientist decides to measure weight in tenths of milligrams. The same data in these units are as follows. Preferred amountof salt x 2 3 4 5 6 8 11 Percent body fat y 21 30 23 30 39 24 31 Find the equation of the regression line for predicting percent body fat from preferred amount of salt when weight is in tenths of milligrams. (Round your intercept to one decimal place and your slope to two…
Develop a scatter diagram between Risk of Stroke and Age. The scatter diagram should include a proper title, a solid trend line, axis titles, a regression equation, and the Coefficient of Determination (R –square). (Note: the dependent variable is usually in the y-axis and independent variable in the x-axis.) Risk of Stroke (%) Age Pressure Smoker (Yes=1) 12 57 152 0 24 67 163 0 13 58 155 0 56 86 177 1 28 59 196 0 51 76 189 0 18 56 155 1 31 78 120 0 37 80 135 1 15 78 98 0 22 71 152 0 36 70 173 1 15 67 135 1 48 77 209 0 15 60 199 0 36 82 119 1 8 66 166 0 34 80 125 1 3 62 117 0 37 59 207 1
The following table shows the mean weight in kilograms of members of a group of young children of various ages. Age (x years) 1.6 2.5 3.3 4.4 5.6Weight ( y kg) 12 15 16 17 20 The relationship between the variables is modeled by the regression line with equation y=ax+by=ax+b . Write down the correlation coefficient.. Use your equation to estimate the mean weight of a child that is four years old . Briefly write a short report of your findings
2
A. run a simple regression- dependent variable is Weeks, independent variable is Age. B. run a multiple regression with dependent variable weeks and independent variable-age, married, head, manager and sales. C. Create the regular and standardized residual plots for both. Please show the tables when entering values of the regression for both the outputs and the scatter plots.
Bluereef real estate agent wants to form a relationship between the prices of houses, how many bedrooms, House size in sq ft and Lot Size in sq ft. The data pertaining to 100 houses were processed using MINITAB and the following is an extract of the output obtained: The regression equation is Price = B + ¢Bedroom + yHouse Size + ALot Size Predictor Coef SE Coef т P 37718 14177 2.66 ** Constant Bedrooms 2306 6994 0.33 0.742 House Size 74.3 52.98 0.164 Lot Size -4.36 17.02 -0.26 0.798 S= 25023 R-Sq=56.0% R-Sq (adj) =54.6% Source DF SS MS F P Regression 3 76501718347 25500572782 *** **** Residual 96 60109046053 626135896 Error Total 99 a) Write out the regression equation. b) Fill in the missing values *, ** *** and ****
Using the accompanying Cost of Living Adjustments data to find the best multiple regression model to predict the salary as a function of the other variables. What would the comparable salary be for a city with the following adjustments: groceries: 4%; housing: 8%; utilities: −3%; transportation: −1%; and health care: 7%? Use a level of significance of 0.05. Using the accompanying Cost of Living Adjustments data to find the best multiple regression model to predict the salary as a function of the other variables. What would the comparable salary be for a city with the following adjustments: groceries: 4%; housing: 8%; utilities: −3%; transportation: −1%; and health care: 7%? Use a level of significance of 0.05. Determine the best multiple linear regression model to predict the salary as a function of the other rates. Select the best answer below and fill in the corresponding answer boxes to complete your choice. (Type integers or decimals rounded to…
1. Plot a scatter diagram (for non-PHStat2 users, just find scatter plot in "Insert" tab in Excel). Does it appear that there is a linear relationship between advertising cost and sales? Why or why not? 2. Compute the correlation coefficient and INTERPRET. 3. From the scatter plot, is it reasonable to perform simple linear regression between the two variables? Why or why not? 4. What is a reasonable choice for the dependent and independent variables. Why? NOTE: please answer ASAP. I really need help.

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