Calculate Karl Pearson's coefficient of skewness from the following data :ProfitsNo. of Cos.ProfitsNo. of Cos.70-8012110-1205080-9018120-1304590-10035130-14030100-11042140-150

Answered: Image /qna-images/answer/0b711995-e63f-4a00-8d6b-7e60abe90f6f.jpg

Answered: Calculate Karl Pearson's coefficient 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

See similar textbooks

Similar questions

Question Three For the past 10 years, you have been observing the sales of your company since you embarked on an aggressive advertising campaign. You have been recording the amounts spent on advertising and the corresponding sales as follows: Year Advert (X)|Sales (Y) 2001 44 2002 40 2003 42 2004 46 2005 48 2006 52 2007 54 2008 58 2009 56 2010 60 10 9 11 12 11 12 13 13 14 15 You would like to determine whether a relationship exists between your two variables of interest and therefore decide to run a regression. a) Specify the estimation model you will use (the econometric form). b) Identify the independent and the dependent variables. c) Use an econometric package of your choice (EViews, SPSS, STATA etc) to estimate the model. d) From the regression output, report the coefficients, standard errors, t-statistics, probability and R-squared (report the results in a table).
15. In the year 2000 several 1st year business students formed an investment group as part of a class assignment. The graph above show the growth of their investment portfolio over the past several years. (Note: t=0 is the year 2000) Growth of Investment Portfolio Year (t) Value of Investments (S) 2000 40 000 2001 53 000 2002 73 245 2003 98 415 2004 148 860 2005 223 500 150 2006 330 250 t 2007 490 850 Time (years) Determine the average rate of growth of their investment between 2000 and 2005. b) On the graph DRAW and use the centered interval to determine the rate of growth of their investment in 2006. a) Value (in $1000) 600 450 300
The below data represent the advertising expenditure and sales of Liu Liu Ltd from year 2010 to 2019. Table: Advertising Expenditure vs. Sales from 2010 to 2019 Year Advert. Expenditure Sales Growth rate of Ad. Expenditure Growth rate of Sales (x, £000) (y, £000) 2010 19 84 2011 22 108 18% 29% 2012 32 82 46% -24% 2013 42 86 32% 6% 2014 47 84 11% -3% 2015 46 94 -2% 11% 2016 58 103 27% 10% 2017 63 115 8% 12% 2018 70 106 11% -8% 2019 80 142 15% 34% Total 479 1004 a. What is the statistical relationship shown in the table and list out 3 characteristics of this relationship?
rience. Question Three The following data represent the net profits made by a sample of 25 companies that operate in real-state sector. 56 97 78 61 79 93 84 76 58 92 89 96 42 44 85 77 53 88 62 84 62 82 75 95 89 1) Choose the best graphical presentation and justify your answer. 2) Based on your answer in (1), construct the selected graphical presentation and comment on the results. Based on your answer in (2), do you think the sector performance is satisfactory? Justify your answer.
Should this table be graphed as linear,quadratic or exponential?
Question 4 A company that focuses on research and development (R&D) is interested in the relationship between profit and some variables that can explain profit variations. They want to predict the profits of some new and exciting projects because some are risky. The predictor variables considered are: RISK which is a company derived metric, R&D which is the research and development costs, REGION (WC, EC and KZN) and average per capita income (INCOME in R1000.00). The analyst decides to estimate the regression function with the following response function. (profit) = bo + b₁XRISK + b₂XR&D + b₂XWc + b₁XEC + b₂XINC Answer the following questions. 4.1. The analyst considered the fact that the effects of multicollinearity may influence some analytical and visual conclusions. Use the following results to show the process of establishing by using extra sums of squares whether there is that multicollinearity present or not. Explain and interpret in detail. SSR (X) = 2573.72, SSR(x₁) = 2600.7,…
Example 20.4 Given below are the price and quantity data for two years relating to three commodities. We are asked to calculate the Passche index. Commodity Ро 90 P1 10 40 15 60 Y 15 80 20 100 20 20 25 40
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…
Question2 The following data relate to the percentage unemployment and percentage change in wages over several years. % Unemployment (x) % Change in wages (y) 1.6 5.0 3.2 2.7 2.2 2.3 1.7 1.6 2.1 4.1 2.1 2.7 2.6 2.9 1.7 4.6 3.5 4.4 1.5 1.6 (a) Calculate the product-moment correlation coefficient between x and y. (Use Ex = 18.9, Ey = 35.2, Ex? = 37.01, Ey? = 132.22, Exy = 64.7)
Example 20.15) Calculate (a) a weighted average of price relatives and (b) a weighted aggregate price index, both for year 2 (based on year 1), for the following commodities: Price (Rs) Commodity Weight Year 1 Year 2 A 5 215 210 B 10 250 275 C 4 1,100 1,300 D 8 950 950 E 13 170 200

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS

Calculate Karl Pearson's coefficient of skewness from the following data : Profits Profits No. of Cos. No. of Cos. 70-80 12 110-120 50 80-90 18 120-130 45 90-100 35 130-140 30 100-110 42 140-150 8