Statistics questions
341 published questions with worked solutions.
- Consider the following statements : 1. Variance is unaffected by change of origin and change of scale. 2. Coefficient of variance...
- The coefficient of correlation when coefficients of regression are 0 2 and 1 8 is
- Let x be the mean of x_1, x_2, x_3, , x_n. If x_i=a+cy_i for some constants a and c, then what will be the mean of y_1, y_2, y_3,...
- Consider the following statements : 1. If the correlation coefficient r_ xy =0, then the two lines of regression are parallel to...
- Consider the following statements : 1. Mean is independent of change in scale and change in origin. 2. Variance is independent of...
- What is the median of the numbers 4 6, 0, 9 3, -4 8, 7 6, 2 3, 12 7, 3 5, 8 2, 6 1, 3 9, 5 2?
- The mean and standard deviation of a set of values are 5 and 2 respectively. If 5 is added to each value, then what is the...
- The standard deviation of the first N natural numbers can be obtained using which one of the following formulae?
- The correlation coefficient computed from a set of 30 observations is 0 8. Then the percentage of variation not explained by...
- Consider the following statements : 1. If 10 is added to each entry on a list, then the average increases by 10. 2. If 10 is...
- The variance of 25 observations is 4. If 2 is added to each observation, then the new variance of the resulting observations is
- If x_i>0, y_i>0 (i=1, 2, 3, n) are the values of two variables X and Y with geometric means P and Q respectively, then the...
- If the regression coefficient of Y on X is -6, and the correlation coefficient between X and Y is - 1 2 , then the regression...
- The set of bivariate observations (x_1, y_1), (x_2, y_2), , (x_n, y_n) are such that all the values are distinct and all the...
- Which one of the following can be obtained from an ogive?
- In any discrete series (when all values are not same), if x represents mean deviation about mean and y represents standard...
- The median of the observations 22, 24, 33, 37, x+1, x+3, 46, 47, 57, 58 in ascending order is 42. What are the values of 5th and...
- Arithmetic mean of 10 observations is 60 and sum of squares of deviations from 50 is 5000. What is the standard deviation of the...
- The mean of 5 observations is 4 4 and variance is 8 24. If three of the five observations are 1, 2 and 6, then what are the other...
- Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation, then what will be the new mean...
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