Mean and variance
= np (p+q) n - 1 ..
= np (p+q) n - 1 ..Mean and Variance of a Discrete Random Variable
Let X be a discrete random variable which can assume values x 1 , x 2 , x 3 ,x n with probabilities p 1 , p 2 , p 3 .. p n respectively then (a) Mean of X or expectation of X denoted by E(X) or m is given by (b) Variance of X denoted by s 2 is given ..
Let X be a discrete random variable which can assume values x 1 , x 2 , x 3 ,x n with probabilities p 1 , p 2 , p 3 .. p n respectively then (a) Mean of X or expectation of X denoted by E(X) or m is given by (b) Variance of X denoted by s 2 is given ..The mean for the number of viewers of a sample of entertainment progr..
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 means of each group of a two-way analysis of variance for two inde..
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..
The means of each group of a two-way analysis of variance for two inde..
The means of each group of a two-way analysis of variance for two independent variables are plotted and shown in the three graphs. Which of these represents a disordinal interaction? Consider the interaction to be significant. => Both graph 1 and graph 2 or Graph 1 or Graph 3 or..
A population consists of the five numbers 1, 3, 5, 7 and 9. Consider a..
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 5 and 3.05 or 5 and ..
A fertilizer is tested on 7 mango trees. The yield of each tree is sh..
A fertilizer is tested on 7 mango trees. The yield of each tree is shown below. 252, 280, 263, 275, 255, 275, 276. Find the mean and variance. => Mean = 278; Variance = 108 or Mean = 268; Variance = 118 or Mean = 268; Varian..
A survey found that 54% of the people believed that Andy Roddick would..
A survey found that 54% of the people believed that Andy Roddick would win this year's US Open. If 250 people are selected at random, then find the mean and variance of the number of people who believe that Andy Roddick would win this year's US open. => 135, 7.88 or 135, 62.1 or..
If two samples have means of 30 and 28 and variances of 12 and 14, wit..
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..
Which of the following statement(s) is/are true? I. z test is used for..
Which of the following statement(s) is/are true? I. z test is used for testing two means and two variances. II. F test is used for testing two variances. III. t test is used for testing two variances. => I only or all are correct or I and II only or II only o..
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