Statistics questions
341 published questions with worked solutions.
- Let two lines of regression be x+y+11=0 and 2x+3y+4=0 for some data. What is the value of correlation coefficient between x and y?
- If the mean of 20 observations, namely x_1, x_2, x_3, , x_ 20 is 1 414, then what is the value of _ i=1 ^ 20 100(2x_i+4)?
- The standard deviation of 100 observations is 10. If 5 is multiplied to each of the observations, then what is the new standard...
- If the random variable X has mean 3 and standard deviation 5, then what is the variance of the random variable Y=2X-5?
- The variance of 10 observations is 25. If 2 is multiplied to each of the observations and subsequently 7 is subtracted from each...
- If the random variable X has mean 5 and standard deviation 4, then what is the standard deviation of the random variable Y=3X+4?
- The standard deviation of X is 4 and the standard deviation of Y is 5. If the correlation coefficient r is 0 8, then what is the...
- If the mean of 50 observations is 40 and the standard deviation is 8, then what is the coefficient of variation?
- Consider the following measures of central tendency for a set of N numbers : 1. Arithmetic mean 2. Geometric mean Which of the...
- The coefficient of correlation is independent of
- If M is the mean of n observations x_1-k, x_2-k, x_3-k, , x_n-k, where k is any real number, then what is the mean of x_1, x_2,...
- What is the sum of deviations of the variate values 73, 85, 92, 105, 120 from their mean?
- If the mean of a frequency distribution is 100 and the coefficient of variation is 45%, then what is the value of the variance?
- For which of the following sets of numbers do the mean, median and mode have the same value?
- The mean of 12 observations is 75. If two observations are discarded, then the mean of the remaining observations is 65. What is...
- The geometric mean of a set of observations is computed as 10. The geometric mean obtained when each observation x_i is replaced...
- If the mode of the scores 10, 12, 13, 15, 15, 13, 12, 10, x is 15, then what is the value of x?
- When the measure of central tendency is available in the form of mean, which one of the following is the most reliable and...
- What is the mean of natural numbers contained in the interval [15, 64]?
- For the set of numbers x, x, x+2, x+3, x+10 where x is a natural number, which of the following is/are correct? 1. Mean > Mode 2....
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