variance sample variance

The mean for the number of viewers of a sample of entertainment programs is 132, with a variance of 23. The mean for the number of advertisements of a sample of entertainment programs is 182, with a variance of 62. Compare the variations. => The number of vie..

The variance of the number of pages of a sample of 20 women's fitness magazines is 62 and the variance of the number of pages of a sample of 15 sports magazines is 23. At 90% confidence level, find the F-test value and check whether variances differ..

The variances corresponding to the number of students having attendence of 95% or above of a sample of 21 schools in one state and 16 schools of another are 20.3 and 9.8. Verify whether the variances for both the states differ at 80% and 90% confidence levels. => do no..

= np (p+q) n - 1 ..

= l e - l e l = l ..

Find the F-test value for testing the variances of two populations. The sample variances from those populations are s 1 2 = 15, s 2 2 = 28. => 1.87 or 0.53 or 3.89 or 6.52..

Find the F-test value and the critical value at 95% confidence for testing the population variances. The data relating to samples are shown. Sample size Sample variance 30 12 25 8 => 1.2, 2.15 or 2.15, 1.2 or 1.94, 1.5 or 1.5, 1.94..

A manufacturer claims that the variance of defective detergent packets in cartons produced by two companies differ significantly. A preliminary investigation revealed that the sample variance of the number of defective packets in 20 cartons of company 1 as 69 and that ..

A manufacturer of bulbs claims that the variance of the span of life of the bulbs is 320 hours. The inspection department selected a random sample of 15 bulbs and found the variance as 210 hours. Find the chi-square test value. At α = 0.05, is there enough eviden..

The formula for the confidence interval for a variance is _________ . => IV. or II. or III. or I...