421. . . . . . . . . error arise due to chance difference between the members of population included in the sample and those not included.
422. A researcher wants to test the significance of the difference between the average performance of the two small sized samples when the information of the population standard deviation is not available, which one of the following hypothesis-testing is suitably used?
423. The regression equation of profits (X) on sales (Y) of a firm is given as: 3Y - 5X + 10 = 0. If the sales of the firm is Rs. 44,000, the profit will be
424. Consider the following statements.
Statement-I: When a null hypothesis gets rejected in statistical hypothesis testing, it is known as II type error in hypothesis testing.
Statement-II: When a sample is small sized and parametric value of the standard deviation is not known, z-test is the most appropriate test for hypothesis testing.
Statement-I: When a null hypothesis gets rejected in statistical hypothesis testing, it is known as II type error in hypothesis testing.
Statement-II: When a sample is small sized and parametric value of the standard deviation is not known, z-test is the most appropriate test for hypothesis testing.
425. Match the following.
| List-I | List-II |
| a. Primary data | 1. Representation of data in form of picture |
| b. Secondary data | 2. The totality of things under consideration |
| c. Pictogram | 3. Data collected by the investigator himself |
| d. Population | 4. Data used by the investigator, which has already been collected by others |
427. The sum of squares of deviation of 20 observations from their mean is 720 and the mean is 60. The coefficient of variation is:
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