x p(x) -1 1/7 0 3/7 2 2/7 4 1/7 What is the expected value or mean of x? What is the variance of x?

Q: Results of an analysis of variances produce SS between = 20, SS within = 30, and an F-ratio with df…

A: Given information- Sum of squares (SSbetween) = 20 Sum of squares (SSwithin) = 30 Degree of freedom…

Q: Simulate two Normally distributed random variables X1 and X2 with correlation 0.8, both should have…

A: Simulate two Normally distributed random variables X1 and X2 with correlation 0.8, both should have…

Q: Roll a dice, X=the number obtained. Calculate E(X), Var(X). Use two expressions to calculate…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Why do we take the square root of the variance to obtain the standard deviation? to make the…

A: We know that, Standard deviation: It is the positive square root of the arithmetic mean(A.M.)  of…

Q: What is the distribution of X? 1) Out of the 38 pizzas that you try, how many would you expect to…

A: Let p be the probability of you liking the pizza. Given that p = 0.08

Q: Arandom variable X is normally distributed with a mean of 121 and a variance of 121, and a random…

A:

Q: Here is a POPULATION of scores: 4 2 3 2 1 29. What is the variance for this population of scores?…

A:

Q: Negative correlation coefficient indicates that the movement of the variables are in: Opposite…

A: Negative correlation coefficient indicates that the movement of variables are in opposite direction.

Q: The random variable X has a normal distribution with a variance of 16 and an unknown mean. If the…

A: Given Data: X is a random variable   Variance (X)=16   X~ Normal (μ, 16) P(x>65)=0.025

Q: What does a z-score of –2.0 mean? A The mean is 2 standard deviations less than the measurement. B…

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: Suppose the relationship between Y and X is given by: Y = 30 - 25X + error  What is the expected…

A:

Q: Compute the standard score (Z-score) for x, when x = 42, the mean of the distribution = 26, and the…

A: x = 42Mean = 26Standard deviation = 8

Q: A local library is analyzing the number of books checked out by patrons in a week. The probability…

A: Let X be the random variable which denotes the number of books checked out by patrons in a week. The…

Q: The director of research and development is testing a new drug. She wants to know if there is…

A: Solution: State the hypotheses. Null hypothesis: H0: µ≤312 That is, the mean time the drug stayed in…

Q: A variance function Var (Y IX = Xx) tells us: about the variability of Y at different values of X. O…

A: Y | X = x means the value of value given X = xConditional Probability is the probability of Y at…

Q: Suppose the relationship between Y and X is given by: Y = 30 - 25X + error  What is the expected…

A:

Q: For any variable X, if: the standard deviation = and the variance = Var(X) Which of the following…

A: Given,For any variable X, the standard deviation = SD and the variance = Var(X).

Q: The expectation of X, which is also known as the mean or average, is E(X) = 7 and the Variance of X…

A: We have given that  The expectation of X, which is also known as the mean or average, is E(X) = 7…