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A professor measures the time X that students take to complete an examination, and the score Y that the students receive. The following measurements are obtained: X: time, Average time (X) = 30 SDx = 10 Y: scores, Average score (Y) = 70 SDy = 20 r = .5
a. About what percentage of students who scored over 92 in the exam?
b. Find the regression equation
c. Evaluate the r.m.s. error for the regression equation.
Calculate a 95% confidence interval on the average weight of packaged mustard seed. Explain very carefully to the packaging workers what the 95% confidence interval numbers mean. Include your Excel output. Is there anything you would want to note ..
Nationwide, the average waiting time until a electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 secon..
Suppose that we generate a random sample from a given dis- tribution. If it is desired that the probability that the sample mean will be within 2 standard deviations of the mean of the distribution is at least .99, how large should the sample size..
weights were measured for 5 female and 5 male beetle pupae. test the hypothesis of no difference in mean weight of
At the .05 significance level, can we conclude that the guideline is still reasonable?
describe what is meant by a binomial experiment. how do binomial experiments apply to each of the four
three-way catalytic converters have been installed in new vehicles in order to reduce pollutants from motor vehicle
do children less than a year old recognize the difference between naughty and nice and show show a preference for nice
The width of a rectangular gate is 2 meters (m) larger than its height. The diagonal brace measures sqrt 6 m. Find the width and height.
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $246.47. Measured in dollars of the year in which the account was opened, how..
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
Use three decimal places in your answers for this problem. The following table was collected.
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