what is variance

What will happen to the variance and standard deviation of a data set if each numerical data is doubled? => Both would be doubled. or Variance increases by 3 times and standard deviation is doubled. or Variance is doubled and standard deviation increases by 4..

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

= l e - l e l = l ..

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

The means of each group of a two-way analysis of variance for two independent variables are plotted as shown in the graph. What does the graph represent about the interaction of the variables? => Disordinal interaction or Ordinal interaction or No interaction..

Find the variance of the data set {1, 2, 3, 4, 10}. => 10 or 9 or 8 or 7..

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..

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 viewers is more variabl..

The variance of the number of students absent in a day of a particular grade in public schools of 21 are 42 and in private schools of 16 are 20. Are the true variances differ at 90% and 80% confidence levels. => differ at both 90% and 80% or do not differ at both 90% and 80% or ..

If the degrees of freedom of the numerator is 15 and that of the denominator is 24 for testing the variances of two populations using F-test, then find the test value and the critical value at 95% confidence. The sample variances are 45 and 78. => 2.65, 1.83 or 1.73, 2.11 or 2.1..