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In the fiscal year 2007, the IRS audited 1.77% of individual tax returns with income of $100,000 or more. If the percentage stays the same this year:
a) Would it be unusual for a return with income of $100,000 or more to be audited?b) What is the probability that two randomly selected returns with income of $100,000 or more will be audited?c) What is the probability that two randomly selected returns with income of $100,000 or more will not be audited?d) What is the probability that at least one of the two randomly selected returns with income of $100,000 or more will be audited?
Determine the proportion of variation in grade that can be explained by the linear correlation between the grade and the number of credit hours earned at the same time of taking the course.
Find a z score for which the area under the standard normal curve from -z to z is 50%. (b) Find the range of scores which will be assigned a grade of C.
Metal detectors at airports are used to determine whether passengers are carrying weapons. If the null hypothesis states that a passenger isn't carrying a weapon, a type I error would occur whenever
If we were to repeat an experiment a large number of times and calculate a statistic such as the mean for each experiment, the distribution of these experiments would be called?
For a recent year, the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
Last school year, student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classificati..
The 97.5% CI for mean changes in Group B minus mean change in Group A is (-4.7 to -0.9). Suppose we want to compute a two-sided p-value to compare the two groups.
Using substitution in one of the standard Taylor series, find the Taylor series about f for 0. Give all terms up to the term in x^3.
First side effect is observed. Use the formula for the sum of a geometric sequence to show that the probabilities in the probability distribution table add to 1.
What is the probability that a randomly chosen package is improperly sealed?
Salary data for a sample of 50 universities were obtained. We are curious about the relationship between mean salaries for assistant professors.
Find the area between the graphs of the functions y1 (x) = x ln x and y2 (x) = -4 exp(3ln x) in the interval between the points x1 = 1 and x2 = e.
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