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Random digits
Each entry in a table of random digits like Table B has probability 0.1 of being a 0, and digits are independent of each other.
(a) What is the probability that a group of ?ve digits from the table will contain at least one 5?
(b) What is the mean number of 5s in lines 40 digits long?
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
approximately 80 of workers are sure that they will be able to retire at 65 years of age. suppose 10 workers are
suppose 3 of cotton fabric rolls and 3 of nylon rolls contain flaws. of the rolls used by a manufacturer 70 are cotton
The length of the thorax (where the wings and legs attach) in a population of male fruit flies is approximately Normal with a mean 0.800 (mm) and standard deviation 0.078 mm. What proportion of flies have thorax length 0.9 mm or longer?
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?
A man is on trial accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be modeled as a significance test with the followi..
The Bureau of Labor Statistics says that baggage handlers, trash haulers, and coal miners are among the occupations having the highest risk of the debilitating injury or illness. For coal miners working over the course of a year, 3.60 injuries per..
Why do we care whether the assumptions required for statistical tests are met? (Tip: You might also want to write your answer on a note card you paste to your computer.)
the following frequency distribution presents a set of exam scores for a class of n 20 students.x f
A decision maker is working on a problem that requires her to study the uncertainty surrounding the payoff of an investment. There are three possible levels of payoff -$1,000, $5,000, and $10,000.
the stats are related to past events. every person cannot perform 100 all of the time. they will have off days. those
recall the gas station example where y is the daily revenues from the gas station. suppose a random sample of 5 days
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