Given
Σdxdy = 2350, Σd2x = 8250, Σd2y = 724, then r will be
| A. | + 0.92 |
| B. | +0.96 |
| C. | +0.36 |
| D. | +0.76 |
|
Option: B Explanation :
Hence the answer is (b) Click on Discuss to view users comments. |
A random sample of 15 pairs of values of X and Y from a normal population gives a correlation coefficient of + 0.6. Is the correlation in the population significant?
| A. | r is significant with -1 |
| B. | r is significant with +1 |
| C. | r is significant |
| D. | r is not significant |
|
Option: C Explanation : N = 15, r = 0.6 Z = 1.1513 log 1 + r/1 - r = 1.1513 log 1 + 0.6/1 - 0.6 = 1.1513 log 4 = 1.1513 x 0.6021 = 0.6932 S.E.2 = 1/√(N - 3) = 1√(15 - 3) = 1√12 = 1/3.464 = 0.29 Z/(S.E.)2 = 0.6932/0.29 =2.39 > 1.96 Hence 'r' is significant at 5% level of significance. The answer is (c). Click on Discuss to view users comments. |
What is the chance of drawing a queen in a draw from a pack of 52 cards?
| A. | 1/9 |
| B. | 1/13 |
| C. | 1/14 |
| D. | 1/12 |
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Option: B Explanation : Total number of cases that can happen = 52 No. of favourable cases = No. of queens in a pack or 52= 4 The probability (P) will be - P = 4/52 = 13 Hence the answer is (b). Click on Discuss to view users comments. |
A company makes electric toys. The probability that an electric toy is defective is 0.01. What is the probability that a shipment of 300 toys will contain exactly 5 defectives?
| A. | 0.1 |
| B. | 3.4 |
| C. | 0.2 |
| D. | 0.36 |
|
Option: A Explanation :
Hence the answer is (a). Click on Discuss to view users comments. |
