23The following data refer to profits, in Rs. per month, of 100companies:Profit in Rs. p.m.No. of companies6,000-7,0007,000-8,0008,000-9,0009,000–10,00010,000-11,00011,000–12,000111519252010Determine Bowley's coefficient of skewness and interpret its value.

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Answered: The following data refer to profits, in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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Problem 1P

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lecture(12.11): Researchers were interested in the effects of co-sleeping on nightime waking and crying in infants. .They assesed the number of minutes parents reported that their infants were awake and crying for a period of three days. Five of the infants co-slept with thier mothers(Co) and four infants slept in crib(Cr).The researchers wanted to see if there was a difference in the total number of minutes of crying during the 3 nights. for the two groups. A summary of the data is given below Co-sleepers night time crying in minutes: 8, 4, 7, 7, 6 Crib-sleepers night time crying in minutes: 30, 17, 22, 25 Test the hypotheses at (aplha=.05) level of signifcance. using the 5 step hypotheses testing procedure. Clealy state the null and alternative hypotheses. Round your answer to 2 decimal places.
,./
Consider the following correlations -0.9 , -0.5 , -0.2 , 0 , 0.2 , 0.5 and 0.9. For each give the fraction of the variation in y that is explained by the least-squares regression of y on x.
The following data measured the stress hormone of steelhead fish as a function of the oxygen content in the water. These data are given below: oxygen 25 36 48 59 62 72 80 100 100 137 hormone 155 184 180 220 280 163 230 222 241 350 Construct a scatterplot and discuss its characteristics Does there appear to be a relationship between water oxygen levels and hormone levels?
Mr. Bates wants to compare the midterm scores of his students who took the course during the fall semester versus the spring semester. Here is the data: Fall 89 86 64 91 72 94 87 83 86 90 74 59 87 97 87 Spring 76 70 82 94 76 66 72 51 75 97 74 81 85 96 74 Can he say that there was a significant difference between his fall and spring students? (Use α = .10)
The following table gives the sales of CD_Rom drives and compact disk players for selected years and can be found in Glassman. Sales are in millions. Year 1988 1990 1992 1993 Sales 0.075 0.24 1.5 4.8 A. On the basis of this data, find the best-fitting exponential regression. Let x = 0 correspond to 1988. State the square of the correlation coefficient. (Use 4 decimal places in you answers.)S(x) = r2 = B. Use this model the estimate the sales in 1997. (Round to the nearest player.)In 1997, there were about million CD_ROM and compact disk players sold.
Consider a two-dimensional scatterplot representing the relationship between two continuous variables. If the correlation coefficient is -1, then: a. All points lie in a straight line with a slope of -1. b. All points lie in a straight line with an unknown negative slope. c. All points do not lie in a straight line but the best fitting regression line has a slope of -1 d. There is a strong positive relationship between the two variables.
!.) Compute the predictive value positive and predictive value negative.
A sales manager collected the following data on annual sales for new customer accounts and the number of years of experience for a sample of 10 salespersons. Years of Annual Sales Salesperson Experience ($1000) 1 1 83 2 91 3 4 94 4 5 101 5 105 6 113 7 8 114 8 10 128 9 12 139 10 14 145 a. Compute the residuals and choose a residual plot for this problem. + x (to 1 decimal) A. В. C. D. Residuals Residuals Residuals Residuals -6 +4 2 -2 -2 -2 -2 -4 -4 --4 -6 -6 -6 4 10 12 4 10 12 4 10 12 4 10 12 The correct plot of the residuals is - Select your answer - b. Do the assumptions about the error term seem reasonable in light of the residual plot? The assumptions concerning the error term Select your answer - + reasonable.
+ Q.1 (a) Reperesnt the follownig yield per acre data by a bar diagram 1942 Year 1940 1941 1943 1944 1945 1946 1947 1948 1949 Yield 7 9 10 12 9 11 15 10 (b) The area sown in Rabi crop is as follows. Prepare a Pie chart: Wheat Hundred thousand 106 acres Gram // // 30 Barley 15 Pulses 10 // Fodders 25 // Other crops 14 // Also calculate the percentage contribution of each crop to the total Rabi crop.

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The following data refer to profits, in Rs. per month, of 100 companies: Profit in Rs. p.m. No. of companies 6,000-7,000 7,000-8,000 8,000-9,000 9,000-10,000 10,000–11,000 11,000–12,000 11 15 19 25 20 10 Determine Bowley's coefficient of skewness and interpret its value.