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Five black and five white marbles are in a box. without looking, three marbles are taken from the box without replacement. what is the probability that all three are black?
A bus company claims that the mean waiting time for a bus during rush hour in less than 7 minutes. A random sample of 20 waiting times has a mean of 5.2 minutes with a standard deviation of 2.1 minutes.
If four students are to be randomly selected from this group, find the probability that exactly two undergraduates will be among the four chosen.
Suppose we estimate this model with OLS, and there is a correlation between unobserved student traits (in the error term) with attendance. How does this bias the coefficient of attendance?
Constructing histogram, Using a normal probability plot, Plotting residuals versus x values.
How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test? Why are raw scores transformed to standardized scores, such as z-scores, in order to interpret those raw scores?
A sample of 20 is taken, resulting in a mean of 16.45 and standard deviation of 3.59. Assume that x is normally distributed and used alpha of 0.5 to test hypotheses.
What is the probability that it will crash at least two times in a given semester? What is the probability that it will not crash at all in a given semester?
An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by the local dealer. The customer relations department will survey a random sample of customers and compute a 99% confidence..
Determine the probability that exactly 8 of them started smoking before 18 years of age.
A banks loan officer rates applicants for credit. The ratings are causally distributed with a mean of 200 also a standard deflation of 50.
A researcher had the idea that background music might enhance performance on a math test and that the effect of music might depend on whether an individual is a music lover or not.
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
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