The following table shows the information as:
| Statistical Measures | Advertisement Expenditure (X) (Rs. Lakhs) | Sales (Y) (Rs Lakhs) |
| Mean | 20 | 100 |
| Standard Deviation | 30 | 12 |
r(X, Y) = 0.8. Then find
(i) the expected advertising expenditure of the company if sale is Rs. 125 lakhs, and
(ii) the expected sales of the company if the advertising expenditure is Rs 32 lakhs.
i).
mean of sales = 20
mean of advertisement cost = 100
Regression equation of X and _______ _____ ___ _______ _______ ____ ________ ______.
_________ __________ ____ ___ _______ ______ _________ _________ __________ _____ ___.
_______ _________ _____ ___ _________ ____ _________ _______ ____ _____ _________.
__________ _____ _______ _______ _____ ________.
___ ___ ____ ____ __________ ________ ____ _____ _____ ______.
____ _________ __________ ________ ________ __________ __________ _____ _______ ____ _____ ___.
________ _______ _________ ___ _________ __________ _____ _________ ____ __________ ____.
________.
Get Full Answer on WhatsApp
In a statistical study relating to the prices (in T) of two shares, X and Y, the following two regression lines were found as 8X - 10Y + 70 = 0 and 20X - 9Y - 65 = 0. The standard deviation of X = 3, then find (i) the values of X and Y, (ii) r(X, Y), and (iii) standard deviation of Y.
Suppose X and Y are the two variables having the correlation coefficient 0.85. The following are the values they have:
| X | Y |
| 10 | 40 |
| 30 | 30 |
| 50 | 70 |
| 60 | 80 |
The following is the distribution of age (in years) of 800 workers:
| Age Group | Age Group |
| 20 — 25 | 50 |
| 25 — 30 | 70 |
| 30 — 35 | 100 |
| 35 — 40 | 180 |
| 40 — 45 | 150 |
| 45 — 50 | 120 |
| 50 — 55 | 70 |
| 55 — 60 | 60 |
Calculate Karl Pearson's coefficient of correlation between X and Y for the following data:
The mean and standard deviation of a set of values are 25 and 5, respectively. If a constant value 5 is added to each value, the coefficient of variation of the new set of values is equal to 10%.
50% of items have characteristics A and B both, 35% have A, but not B, 25% have B but not A. Show that there must be some misprints in this report.
The following table shows the information as:
| Statistical Measures | Advertisement Expenditure (X) (Rs. Lakhs) | Sales (Y) (Rs Lakhs) |
| Mean | 20 | 100 |
| Standard Deviation | 30 | 12 |