sample variance vs population variance

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..

A population consists of the five numbers 1, 3, 5, 7 and 9. Consider all the samples of size 2 that can be drawn without replacement from the population. Find the mean and the variance of the sampling distribution means. => 6 and 4.05 or 6 and 3 or ..

The basic assumption(s) for estimating the difference between two variances is/are: I. The samples must be dependent on each other. II. The samples must be independent of each other. III. The populations from which the samples were obtained must be ..

Check whether the population variances differ significantly at 90% confidence. Also find out F-test value. The data relating to two samples from those populations are shown in the table. Sample size Sample variance 25 7 16 5.6 =>..

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..

In a statistical hypothesis test, s 2 is the sample variance, s 2 the population variance and n the sample size, than the formula for the chi-square test for a single variance is: => n s 2 σ 2 or ( n - 1 ) s 2 σ 2 or ( n - 1 ) ..

If two samples have means of 30 and 28 and variances of 12 and 14, with 20 and 25 as the sizes, find the z score for difference of two population means. => 2.154 or 2.075 or 2.320 or 1.857..

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..

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..

The average time a person spoke over the cell phone while driving in a day was reported as more than 14.5 minutes. A researcher wished to test this report. He selected a sample of 100 persons for his study and found that the mean was 15.6 minutes. At α = 0.01, what will be the concl..