42. In a small town, a survey was conducted in respect of profits made byelall shops. The following results were obtained :No. of shopsNo. of shopsProfit or loss In(Rs. '000)4 to-3-3 to -2-2 to-1-1 to 00 to 1Calculate() The average profit made by a retail shop.() Total profit by all shops.(iil) The coefficient of variation of earnings.Profit or loss in(Rs. '000)1 to 22 to 33 to 44 to 55 to 6561 40102228382418100.0

We want to find mean, total profit and coefficient of variation.

Answered: 42. In a small town, a survey was…

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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2
Table 1 reports the estimates of the effects of personal characteristics on a monthly wage. The variable birth order measures order of birth, i.e. 1st child, 2nd child etc. The total variation in monthly wage is 138787905. Use this table to answer the following questions: a) In column 6, are the effects of being black, living in the south, and living in metropolitan jointly important variables in determining monthly wage? (Hint: You can use R² to test this hypothesis). b) In column 5, are the effects of being black and living in the south jointly important variables in determining monthly wage? (Hint You can use R² to test this hypothesis). c) Do explanatory (independent) variables in column 6 jointly explain monthly wages? (Hint: You can compute RSS from the unrestricted model using R2 and TSS from part e.)
(i) The sale of houses in an area (S) depends on the level of per capita income of people in that arca (1), the population of the area in "000s (po), property tax (tx) in % and an index value of property price in that area (P). The relationship of dependant and independent variables (Dv & IV) is given by the following function (derived by running multiple repression on last 2 years data): S= 2100 + 0.20 I + 8 po - 23 tx - 2.75 P a) If the current level of IVs is given by: I= 33,000; po = 48,000; tx = 12% and P= 32, then what is the sale quantity that can be expected? b) If all IVs remain at same level, while only Pchanges to 28, what will be new quantity of houses sold? (ii) You are surveying a sample of college students for understanding their food habits. What care will you take while asking questions? Identify one such consideration. (iii) For a given multiple regression exercise, in which manager wanted to find the relationship of firm's sales of a zone (dependent variable) with…
The figure to the right shows the total sales, in thousands of dollars, from the distribution of x thousand catalogs. Find and interpret the average rate of changes of sales with respect to the number of catalogs distributed for the given changes in x. (a) 10 to 20 (b) 20 to 30 (c) 30 to 40 (d) What is happening to the average rate of change of sales as the number of catalogs distributed increases? (a) The average rate of change over 10 to 20 is (Type an integer or a simplified fraction.) 70+ 60- 50- Sales (in thousands) 8 8 8 8 8 40- 30- 20- 9 10- 0- 0 32 41 47 -51 10 20 30 40 50 60 Number (in thousands)
5.1 (1) The graph shows the population of bacteria in a culture. a) Determines the average rate of variation of the crop between the 3rd and 4th hour. B) What does this rate of change mean?
A company is studying the relationship between the mean annual percent return on capital (profitability) (y) and the mean annual percentage sales growth (x) for eight acrospace and defense companies. The data are summarised as follows: n=8, Σχ=1106, Σv=1399, Στ΄ = 2662.14, Στ’ = 2784.65, Σαν =1897.68 (a) (b) (d) Compute the product-moment correlation coefficient for the data. Interpret your result. Obtain the least square regression line equation. Calculate the coefficient of determination for the above data and comment on your answer. Find the value of profitability's percentage when the sales growth is 10 percent.
8- Following estimated demand equation for shoes in the United States over the period 1929 to 1991 has been reported in the research. Variable Intercept Income per capita (X)0.0289 Price of the Shoes (P)-0.0923 Advertisement (A) Coefficients Standard Error t-value 19.575 (c) 9.3125 0.05122 (b) 0.035 0.0152 2.324 R= 0.857 Using the above estimated regression table answer the following questions: a) Forecast the demand for shoes for the year 1962 if the forecast values of the independent/explanatory variable are those given in the following table. Year X PA 1962 1646 20 1000 b) Calculated the t-value of the Price of shoes (P). c) Calculate the Standard error of Income per capita (X). d) Are coefficients (X, P and A) statistically significant? e) Interpret the R? of the model.
6. In the table beloe provides predicted population data about the world and India.RegionPredicted Population (millions)Region: 2035 2050World : 8,933 9766India : 1,655.7 1670.1 (d) Calculate the absolute change in the percent of the world population that liives in India between 2035 and 2050. Round your results to one decimal place. (e) The predicted population of India is incresing while the percentage of the world population predicted to live is decresing. How can that happen? Explain in full sentences.
Given the values in the table in the image attached, how do I find the value of r^2? Does the value suggest that the model is a good, somewhat good, or bad fit? About what percent of the total variation in y can be explained by the model? What percent is unexplained?
/ 13.14. Owing to change in prices the consumer prict index of the working class in a certain area rose in a month by one quarter of what it was before to 225. The index of food became 252 from 198, that of clothing from 185 to 205, that of fuel and lighting from 175 to 195 and tiat of miscellaneous from 138 to 212. The index of rent, however, remained unchanged at 150. It was known that the weights of clothing, rent and fuel and lighting were same. Find out the exact weight of all groups.
P(A)= 0.23, P(B)= 0.46, P(A and B)= 0.15 Calculate P(A' and B)
Obtain the relationship between marginal and joint characteristics functions.

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