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What is the probability that the last four digits of a nine-digit social security number are all odd? (Don't use a simulation, just working with the numeric fractions is fine).
Suppose that a market research analyst for a cell phone company conducts a study of their customers who exceed the time allowance included on their basic
In a sample of 200 women, 144 of them said they were in debt. Test the claim that women are in deeper debt than men, at a=0.01.
Table shows the distribution of household income in 1999-2002 for three geographical areas in the UK. Using diagrams compare these distributions.
The probability will be .90 that the sample mean will not differ from the true mean by more than 20 percent of the std. deviation. How large a sample should he take?
For each of the following three scenarios, state which hypothesis test you would use from among the four introduced so far: the z test, the single-sample t test, the paired-samples t test, and the independent-samples t test.
What examples of progress could leaders like W.E.B Du Bois, James Weldon Johnson, A.Philip Randolph, and Marcus Garvey point to in the 1920s?
Formulate the null and alternative hypotheses for a hypothesis test. Identify the population and describe how to select a random sample for a hypothesis test. State in clear terms the conclusion that should be given if the null hypothesis is rejec..
For a Brownian motion process X(t), let X0 = X(0), X1 = X(1), . . . represent samples of a Brownian motion process with variance αt. The discretetime continuous-value process Y=, Y2,... defined by Yn = Xn - Xn-1is called an increments process.
A motor transport company has 50 similar buses. The management suspects that its control of these vehicles is inadequate. What suggestions could you make for investigating vehicle use, and tightening managerial control over the company?
in an experiment to see if aspirin reduces the chance of having a heart attack a placebo isa the place where the
What is the possible range of values for the Spearman rank-order correlation and how are these values interpreted?
The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered.
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