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In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule: the top 10 % receive A's, the next 20 % receive B's, the middle 40% C's, the next 20% received D's, and the bottom 10% receive F's. Find the lowest score on the final exam that would qualify a student for an A, a B, a C, and a D.
What is the probability that the total number of customers who enter the supermarket in one day is greater than 11700?
A banks loan officer rates applicants for credit. The ratings are causally distributed with a mean of 200 also a standard deflation of 50.
Calculate the p- value and use it to test H0 versus H a at each of a .10, .05, .01, and .001. d How much evidence is there that the mean composite satisfaction rating exceeds 42?
Find the 90% confidence interval for the mean, variance, and standard deviation for the price in dollars of an adult single-day ski lift ticket.
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated.
a student received an a on the first test of the semester. the student wants to calculate the probability of scoring an
the nypd precincts in manhattan are numbered from 1 to 34. if the variable precinct is included in a dataset about
In a certain county, 40% of registered voters are Democrats, 32% are Republicans, and 28% are Independents. Sixty percent of the Democrats, 80% of the Republicans, and 30% of the Independents favor increased spending to combat terrorism. If a..
a multiple-choice test consists of 77 questions with possible answers of a b c d e. estimate the probability that with
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
q1 the gallop poll folks found that 27 of adults surveyed national survey said that they had been in a tornado.
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