Statistics questions
341 published questions with worked solutions.
- If SD of n observations x_1, x_2, x_3, , x_n is 5, then SD of 2 - 3x_1, 2 - 3x_2, 2 - 3x_3, , 2 - 3x_n is
- Consider the following statements : 1. The mean and median are equal in symmetric distribution. 2. The range is the difference...
- The scores of 15 students in an examination were recorded as 10, 5, 8, 16, 18, 20, 8, 10, 16, 20, 18, 11, 16, 14 and 12. After...
- For 10 observations on price (x) and supply (y), the following data was obtained : x=130, y=220, x^2=2288, y^2=5506 and xy=3467....
- Two variates, x and y, are uncorrelated and have standard deviations _x and _y respectively. What is the correlation coefficient...
- If the covariance between x and y is 30, variance of x is 25 and variance of y is 144, then what is the correlation coefficient?
- The variance of 20 observations is 5. If each observation is multiplied by 3, then what is the new variance of the resulting...
- The mean of a group of 100 observations was found to be 20. Later it was found that four observations were incorrect, which were...
- The mean weight of 150 students in a certain class is 60 kg. The mean weight of boys in the class is 70 kg and that of girls is...
- If two regression lines between height (x) and weight (y) are 4y-15x+410=0 and 30x-2y-825=0, then what will be the correlation...
- Consider the following statements : Statement 1 : Range is not a good measure of dispersion. Statement 2 : Range is highly...
- If the data are moderately non-symmetrical, then which one of the following empirical relationships is correct?
- For given statistical data, the graphs for less than ogive and more than ogive are drawn. If the point at which the two curves...
- If the regression coefficient of x on y and y on x are - 1 2 and - 1 8 respectively, then what is the correlation coefficient...
- A sample of 5 observations has mean 32 and median 33. Later it is found that an observation was recorded incorrectly as 40...
- Consider the following statements : 1. Coefficient of variation depends on the unit of measurement of the variable. 2. Range is a...
- Given that the arithmetic mean and standard deviation of a sample of 15 observations are 24 and 0 respectively. Then which one of...
- Which one of the following can be considered as appropriate pair of values of regression coefficient of y on x and regression...
- It is given that X =10, Y =90, _X=3, _Y=12 and r_ XY =0 8. The regression equation of X on Y is
- If a variable takes values 0, 1, 2, 3, , n with frequencies 1, C(n, 1), C(n, 2), C(n, 3), , C(n, n) respectively, then the...
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