calculating variance and standard deviation

To calculate the confidence interval for variance or standard deviation, a statistical distribution called ______ is needed. => chi-square distribution or binomial distribution or poisson distribution or multinomial distribution..

In the discrete series, when deviations are taken from actual mean, the formula ..

Standard Deviation of a statistical data is defined as the positive square root of the arithmetic mean of the squared deviations of items from their arithmetic mean of the series under consideration. The standard deviation is denoted b..

of a statistical data is defined as the positive square root of the arithmetic mean of the squared deviations of items from their arithmetic mean of the series under consideration. The standard deviation is denoted by s (sigma). The standard deviatio..

Find the mean, variance and standard deviation for the number of heads, when 20 coins are tossed. => 10, 5, 5 or 5, 5 2 , 5 2 or 10, 5 , 5 or 5, 5 2 , 5 2..

Standard Deviation for continuous series - In this series too deviations may be taken either from the actual mean or from standard mean. The calculations will be simplified if the deviation are taken from assumed me..

If 20% of the computer chips are defective, then find the variance and standard deviation of a lot of 542 chips. => 86.72, 9.31 or 433.6, 108.4 or 108.4, 86.72 or 9.31, 86.72..

A random sample of 81 students was tested for the problem solving approach skills. The variance of the scores obtained from the sample was found to be 144. Find the 80% confidence interval for the variance and standard deviation. Assume that the variable is n..

55% of the students passed in an online examination. If 600 students are selected at random, then find the variance and standard deviation of the number of students passing the examination. => 148.5, 12.19 or 330, 12.19 or 330, 148.5 or 12.19, 148.5..