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Suppose that y is a discrete random variable with mean u and variance o2 and let X=Y+1
a. Do you expect the mean of x to be larger than, smaller than or equal to E(Y)? why?
b. Use therom 3.3 and 3.5 to express E(X) - E(Y+1) in terms of E(Y). Does this result agree with answer to part a.
c. Recalling that the variance is the measure of spread or dispersion, do you expect the variance of X to be larger than smaller than or equal to o^2 = V(Y)? why?
Find the expected value when you pick 4 and when you pick 5, betting $1 each time. Based on your results from parts a and b, are you better off picking 4 numbers or picking 5? Explain your reasoning.
The correlation between the two variables is 0.4. Hourly earnings are regressed on years of education. What is the slope of the OLS regression line?
the totals of the individual weights of garbage discarded by 62 households in one week have a sample mean of 24.443 lb.
Determine whether the following equations have a solution or not? Apply the discriminant, are the solutions real, repeated real, or complex?
Is there convincing evidence that the proportion of American adults who oppose reinstatement of the draft is greater than 0.7? Use a significance level of 0.05.
why might a researcher choose to use a multiple regression specification?a. to include more explanatory variablesb. due
A sample of 35 workers was randomly selected from a workforce of 110 to estimate the average amount spent weekly at a canteen by each worker.the sample meam was $13 and the sample standard deviation was $3.25.
it has been recorded that 10 people get killed by shark attack every year. what is the probability of having 5 or 6
Compute an exponential smoothing forecast with a =.20, an adjusted exponential smoothing forecast with a = .20 and B =.20 and a linear forecast. Compare the three forecast, using MAD and average error (E) and indicate which seem to be most accurat..
Event A occurs with probability 0.2. Event B occurs with probability 0.3. Event C occurs with probability 0.4. If A, B, and C are disjoint, then
How large a sampl.e is needed to estimate the true proportion of home owners who have vegetable gardens to within 4 percentage points with 95% confidence?
q1. a manufacturing company measures the weight of boxes before shipping them to the customers. if the box weights have
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