91. If r12 = 0.9, r13 = 0.75, r23 = 0.7, find r1.23
92. If rxy = 0.38, ryz = 0.91 and rxz = 0.62. Find the partial correlation between x and y with z as fixed variable.
93. 21 students took a exam. The sample variance is foundto be 80. The examiner claimsthat based on his past experience the true variance has been atleast 100. Does the sample result shows that the population variance significantly less than 100?
[Hint $${x^2} = \frac{{\left( {r - 1} \right)s}}{{{\sigma ^2}}} = \frac{{\left( {21 - 1} \right) \times 80}}{{100}} = 16$$
The value of x2 for 20 df 5% level of significance is 31.4. x2 value is less than table value.]
[Hint $${x^2} = \frac{{\left( {r - 1} \right)s}}{{{\sigma ^2}}} = \frac{{\left( {21 - 1} \right) \times 80}}{{100}} = 16$$
The value of x2 for 20 df 5% level of significance is 31.4. x2 value is less than table value.]
94. 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?
95. Assumptions of Karl Pearson's co-efficient of correlation includes
96. Both the regression coefficients cannot be
97. Z-test is a
98. Given
Sale price of product X
Sale price of product Y
1
33
4
27
7
23
9
17
15
15
17
14
25
11
30
6
The above values expressed to the
| Sale price of product X | Sale price of product Y |
| 1 | 33 |
| 4 | 27 |
| 7 | 23 |
| 9 | 17 |
| 15 | 15 |
| 17 | 14 |
| 25 | 11 |
| 30 | 6 |
99. If A and B are two mutually exclusive events, then probability that either of the two events will appear is the sum of their
100. Suppose that in key punching of 80 column IBM cards, the mean number of mistakes per card is 0.3. What per cent of cards will have no mistake?
Read More Section(Business Statistics)
Each Section contains maximum 100 MCQs question on Business Statistics. To get more questions visit other sections.