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Suppose the Internal Revenue Service is studying the category of charitable contributions. A sample of 18 returns is selected from young couples between the ages of 20 and 35 who had an adjusted gross income of more than $100,000. Of these 18 returns 4 had charitable contributions of more than $1,000. Suppose 3 of these returns are selected for a comprehensive audit.
What is the probability exactly one of the three audited had a charitable deduction of more than $1,000?
What is the probability at least one of the audited returns had a charitable contribution of more than $1,000?
A researcher conducts some research in which they identify a significant positive correlation (r =0.42) between the number of children a person has and their life satisfaction. Which of the following is it inappropriate to conclude from this resea..
Evaluate your histograms for any outliers in your data. Based on your evaluation of outliers, you may trim no more than 1% of the data contained in the data set. This must be done symmetrically (i.e., trimming no more than 0.5% off the top and 0.5..
Mauricio Cruz, a wine merchant for Cruz's Spirits Emporium, wants to determine if the average price of imported wine is less than the average price of domestic wine. The data obtained is shown in the table below.
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
Here are heart rates for a sample of 30 students before and after a class break. At alpha =.05, was there a significant diffeence in the mean heart rate?
The following two variables: x = the number of police patrol cars cruising in a given neighborhood, and y = the number of burglaries committed in the neighborhood?
The Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.
Find the probability that a standard normal random variable will assume a value between: Find a z such that 70% of the area is above that value.
Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
The frequency distribution below was constructed from data collected from a group of 25 students. Construct a relative frequency distribution.
An article in Annals of Mathematical Statistics reports the following data on the number of borers in each of 120 groups of borers. Does the Poisson pmf provide a plausible model for the distribution of the number of borers in a group?
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