calculating value of variance

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..

A reaction is carried out at two different initial concentrations of a reactant [A], that is [A] 0 , 1 and [A] 0 , 2 and the respective t 1 / 2 values (t 1 / 2 ) and (t 1 / 2 ) 2 are obtaine..

Write down the formula of the given molecule/ion leaving some space between the atoms. Write oxidation number on the top of each atom with 'x' in case of the atom whose oxidation number has to be calculated. Write down the total oxidation numbers of each element beneath the formul..

Find the F-test value for testing the difference between two population variances. The data shows the two samples from each of the populations. => 1.11 or 0.63 or 2.38 or 2.16..

The data shows the deaths related to bad weather over 6 years. Find the F-test value and verify whether the variances differ at 90% confidence level. => 7.68, differ or 9.33, do not differ or 5.05, differ or 4.96, do not differ..

Which of the following is/are true? I. The mean value of F is approximately zero. II. F distribution is a family of curves based on the degrees of freedom of the variance of the numerator. III. F distribution is a family of curves based on the degrees of freedom of the vari..

The variance of the measures of rainfall in 20 different cities of two different states are 6 cm and 9.2 cm respectively. At a confidence level of 90%, find out the test value and check whether the variance of the rainfall in the first state is greater than that of the..

A researcher claims that the variance of the distances traveled by the buses of Indiana in a particular day is greater than that of the buses of Lowa. The journeys of 31 buses of Indiana and 25 for Lowa were observed and the variances were found as 5600 and 3200 respectively. Fi..

Do employees perform better at work with music playing? The average productivity level of 20 employees was 6.4 with a variance of 4 when the music was playing. Another day when the music was turned off, the productivity level was 5.2 with the variance of 2.8. Find the test ..

Past records indicated that the variance of scores in final exams of the high school students was 6.16. New techniques were adopted for teaching and it was observed that in a random sample of 80 students, the variance of scores after the final exam is 6.42. Find the chi-square t..