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A quarter is bent so that the probabilities of heads and tails are 0.40 and 0.60. If it is tossed twice, what is the covariance of Z, the number of heads obtained on the first toss, and W, the total number of heads obtained in the two tosses of the coin?
a sample of 400 female consumers of a product had a mean age of 33 with a standard deviation of 5 and a sample of 500
The researcher wants to estimate the proportion who agree with a 0.03 margin of error with a 90% level of confidence. For this situation, the sample size of 389 is large enough.
of 43 bank customers depositing a check 18 received some cash back. construct a 90 confidence interval for the
can a test of significance show a statistically significant relationship while a measure of association shows a weak
If the average number of textbooks in a professors' offices is 16, the standard deviation is 5, and the average age of professors is 43, with a standard deviation of 8, which data set is more variable, the textbooks or the age? Calculate the coeff..
Standard deviation of 11.6 hours. what is the 99% confidence level for the mean number of hours that the population of high school students spent working each week?
Find the probability of at least 1 hit in 4 tries in 1 game. Assuming that this batter gets up to bat 4 times each game, estimate the probability of getting a total of at least 56 hits in 56 games.
an exhaustive survey of all users in a wilderness park taken in 1980 revealed that the average number of persons per
Are all the events in this distribution mutually exclusive? Describe in detail.
Produce the summary output and give the estimated equation for your chosen model and find a suitable regression model to predict y2 using x2 as an explanatory variable. Comment on the output used and justify your choice of model.
Assuming that the manager's claim is correct, calculate the probability that 117 or fewer of 205 randomly selected marketing researchers would disapprove of the scenario.
At the 0.05 level ofsignificance is there evidence of a difference in the mean distances traveled by the golf balls with different designs?
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