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Suppose that the number of wi-fi interruptions on your home network varies, with an average of 1.5 interruptions per day. Assume that the Poisson setting is reasonable. Model the daily count of interruptions X using the Poisson distribution.
What is the probability of 2 or fewer interruptions on a given day?
A researcher obtains a significant interaction and a significant main effect. Which significant effect should the researcher typically analyze first? Explain.
An economist is deriving a model to predict outcomes on the stock market. He creates a list of expected points on the stock market index for the next two weeks.
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
Find the slope and intercept and write the estimated Regression equation. Find SSE, SST, and SSR. Also find the Coefficient of Determination and interpret it. Find the correlation coefficient.
What are the assumptions of multiple regression and correlation analysis?
She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
A hypothesis test is carried out using α = 0.01 the level of significance, and H0 cannot be rejected. What is the most accurate statement we can make about the p-value for this test?
Testing a random number generator. Our statistical software has a "random number generator" that is supposed to produce numbers scattered at random.
a. Estimate: Return = ß0 + ß1 P/E + ß2 P/S + e. Are the signs on the coefficients as expected? Explain.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be:
(a) Let Tn := min{t > 0: X{t) = n (> 1)}. That is, Tn is the time needed for the number of individuals in the population to be equal to n. Show that the probability density function of Tn is given by
Don't do the entire test (a) the critical value(s) and (b) the calculated (observed) value of the Chi-square test about s
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