For a binomial variable X if n = 21 and p = 0.5. Find the variance?
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- 2. Let X - tp. Verify the mean and variance formulas. (Hint: Let X = p/2UV-1/2.)The number of passengers on a bus follows a negative binomial distribution with parameters r = 2 and ß. 20% of the time, ß = 5; 50% of the time ß = 10; and 30% of the time ß = 15. Calculate the variance of the number of passengers on a bus. A 49 в 168 193 D 291 E 315The correlation coefficient between variables X and Y is 0.68. What does this signify? a. When X increases by 1, Y increases by 0.68 b. When Y increases 1, X increases by 0.68 c. The variance shared by X and Y is 68% d. The variance shared by X and Y is less 20%
- Can you explain how I can find the variance for the data using the formula provided? I don’t understand what the numbers for E and X are.Suppose X∼Bin(20,0.8).X∼Bin(20,0.8). What is the variance of XX? A. 15 B. 16 C. 5 D. 10 E. 3.2Assume a variable has only 3 observations: x1=1, x2=5, x3=6. What is the variance of this variable x? 8.6 None of others. 4.7 2.9
- Based on the scatterplot, what is the most likely value of the linear correlation coefficient r?A. 0B. 1C. -1D. -0.5The mean of X is 5 and its SD is 3. The Mean of Y is -2 and its SD is 6. You are now being told they are independent. Find the value of each requested parameter A. The mean of T= -3x +20 is ___ B. The mean of W= Y - X is ___ C. The variance of D = X - 2Y is ___Help need:
- Consider the following data: 7 8 P(X = x) 0.2 0.2 0.2 0.2 0.2 %3D Step 2 of 5: Find the variance. Round your answer to one decimal place. 5.Given that the variances of random variables X and Y are 1600 and 900, respectively. The correlation between X and Y is 0.64. Find Var (X +Y).The correlation coefficient between variables X and Y is 0.62. What does this signify? Question 8Answer a. When Y increases 1, X increases by 0.62 b. When X increases by 1, Y increases by 0.62 c. The variance shared by X and Y is less 20% d. The variance shared by X and Y is 62%