The following table shows the number of salesmen working for a certain concern :19824619831984´YearNumber1980281981384056Use the method of least squares to fit a straight line and estimate the number of salesmen for 1985 and1986.

We have given that, X :- 1980, 1981, 1982, 1983, 1984 Y:- 28, 38, 46, 40, 56 Then, We will find…

Answered: The following table shows the number of…

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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For a sample of 41 California cities, a sociologist studies the crime rate in each city (crimes per 100,000 residents) as a function of its poverty rate (in %) and its median income (in $1,000s). The sociologist finds that SSE = 4,182,663 and SST= 7,732,451. Round all answers to 4 decimal places. What is the standard error of the estimate? What proportion of the sample variation in crime rate is explained by variability in the predictor variables? What proportion is unexplained?
The maximum discount value of the Entertainment® card for the "Fine Dining" section for various pages is given in the table below. Page number Maximum value ($) 4 17 14 18 25 16 32 18 43 18 57 15 72 16 85 14 90 18 Let page number be the independent variable and maximum value be the dependent variable. Part (a) Draw a scatter plot of the ordered pairs. Part (b) Calculate the least-squares line. Put the equation in the form of: ŷ = a + bx. (Round your answers to three decimal places.) ŷ = ________ + __________ x Part (c) Find the correlation coefficient. (Round your answer to four decimal places.) r = Is it significant? (Use a significance level of 0.05.) Yes No Part (d) Find the estimated maximum values for the restaurants on page ten and on page 70. (Round your answers to the nearest cent.) Page 10: $ ____________ Page 70: $ ____________ Part (e) Does it appear that the restaurants giving the…
58. Fit a straight line trend by least squares method and tabulate the trend Pvalues from the following figures of production of a cement factory : Year Production ('000 tonnes) : 2008 77 2009 88 2010 94 2011 2013 2012 91 2014 90 85 98
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You have the following data on consumption and income (in $10,000s). Income 9 11 5 8 2 9 12 Consumption 7 7 2 7 2 8 9 Make a scatterplot and draw the line of best fit.
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An entrepreneur who owns and operates two businesses (A and B) would like to analyze their profitability. They would like your help in the analysis. They give you the annual net profit (in thousands of $) for each business from 2008-2020. Table 1: Annual Net Profits for Businesses A and B Business Year Profit Business Year Profit 2008 -50 2008 -10 2009 57 2009 30 2010 71 2010 27 2011 64 2011 22 2012 60 2012 21 2013 50 2013 20 A 2014 41 2014 24 2015 59 2015 24 2016 71 2016 32 2017 71 2017 36 2018 74 2018 37 019 81 20 40 2020 97 2020 49 a. Suppose you want to graph the distribution of profits. Explain why using only one stem- plot might not be optimal for the analysis. b. Describe the correct stemplot to use. Generate this stemplot. Explain your steps. What can you say about the distribution from this stemplot? c. When are stemplots useful? And why is that? d. Suppose that instead of having 26 observations you have 200 observations. What graph should you generate? e. What other type of…

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The following table shows the number of salesmen working for a certain concern : ´Year Number 1980 28 1981 38 1982 46 1983 40 1984 56 Use the method of least squares to fit a straight line and estimate the number of salesmen for 1985 and 1986.