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Of federal taxpayers who itemize their deductions and have adjusted gross incomes between $35,000 and $50,000, the dollar amount of gifts to charity claimed on Schedule A is normally distributed with a mean of $549 and a standard deviation of $168.
a. What percentage of taxpayers with adjusted gross incomes between $35,000 and $50,000 will claim less than $400 in gifts to charity on Schedule A?
b. What percentage of taxpayers with adjusted gross incomes between $35,000 and $50,000 will claim between $500 and $600 in gifts to charity on Schedule A?
c. The IRS decides to audit any return for which the deduction for gifts exceeds that for 99% of those who itemize and have adjusted gross incomes of between $35,000 and $50,000. Above what dollar figure is a tax return automatically flagged according to this criterion?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the oth..
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
a marketing survey involves product recognition in new york and california. of 558 new yorkers surveyed 193 knew the
crude oil of specific gravity 0.86 is to be pumped at 20c. what is the min pipe size that can be used in order to
At the 0.05 significance level, can we conclude that the mean waiting time at the Warren Road MacBurger is less than 3 minutes?
The data in the next table resulted from an experiment that used a completely random design. Test the null hypothesis that u1 = u2 = u3, where ui represents the true mean for treament i, against the alternative that at least two of the means differ..
A machine is set to fill a small bottlewith 9gram of a medicine. A sample of 8 bottles revealed the following amount (g) in each bottle. At the .01 sig level, can we conclude that the mean weight is less than 9 grams?
What is the difference between common cause variation and special cause variation? What should you do to improve a process when special causes of variation are present?
Infers that less than 60% of the items are sold within 1 week. Find the probability of the type I error, then state your conclusion in words of the problem at a level of significance of 0.07.
Find a 95% confidence interval for the difference in the proportion of deaths between the streptokinase and the control group.
Using standard methods for linear statistical prediction, find the percent increase in sales revenue that would be expected if the price were lowered by 15%. Find the usual measure of the strength of association between price reduction and sales re..
Percentage who say "Yes" from 7% to 3.5%? Explain to someone who knows no statistics the advantage of taking a larger sample in a survey of opinion.
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