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At a university, the average cost of books per student has been $400 per student per semester. The Dean of Students believes that the costs are increasing and that the average is now greater than $400. He surveys a sample of 40 students and finds that for the most recent semester their average cost was $430 with a standard deviation of $80. What is the test value for this hypothesis test?
Show that there is no rational number b/a whose square is 2, as follows: if b^2 = 2a^2, then b is even, so b = 2c, so, substituting and cancelling 2, 2c^2 = a^2.
Reject H0 at β β = .01; there is evidence of a difference between the mean voter turnouts for urban, suburban, and rural precincts.
A citizens' group interested in generating public and financial support for a new university basketball arena has published a questionnaire in area newspaper. Readers return the questionnaire by mail.
The cost of using the equipment is $250. The materials used in one shirt cost $10, and Gina can sell these for $15 each. How many shirts must Gina sell to break even?
The mean lifetime of light bulbs made by this manufacturer differs from 55 months? Can we conclude that the mean lifetime of light bulbs made here differs from 55 months?
the national freshman-to-sophomore retention rate has held steady at 74. a certain college has 499 of the 585 freshman
the citizens of a certain community were asked to choose their favorite pet. the pie chart below shows the distribution
In an effort to control costs associated inventory management, a study was conducted on the relationship between sales (X, in billions of US dollars) and inventory levels (Y, in billions of US dollars), with a random sample of size 20. You are ass..
calculate the odds ratio x for the risk between gender and all-cause mortality when age and race are controlled using
At the first tri-city meeting, there were 8 people from town A, 7 people from town B, and 5 people from town C. If the council consists of 5 people,
in the new dunn zone at waldo stadium the university has decided to run a promotion to increase student attendance. for
A box of nine golf gloves contains two left-handed and seven right-handed ... box without replacement, what is the probability that- (X) both gloves are right handed and (Y) one left-handed and one ... If two gloves are randomly selected with repl..
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