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Dotties Tax Service specializes in federal tax returns for professional clients, such as physicians, dentists, accountants, and lawyers. A recent audit by the IRS of the returns she prepared indicated that an error was made on 15 percent of the returns she prepared last year. Assuming this rate continues into this year and she prepares 63 returns. What is the probability that she makes errors on:
(a) More than 6 returns?(b) At least 6 returns?(c) Exactly 6 returns?
Normal distribution has mean of 80 and standard deviation of 14. Find out the value above which 80 percent of values will occur.
The director for training at a company that manufactures electronic equipment is interested in determining whether different training methods have an effect on the productivity of assembly line employees.
Give critical test statistic and compute sample test statistic. Test null hypothesis at alpha level .01.
A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42. Find a 90% confidence interval for the mean amount left by all groups.
what will be the standard deviation of the share price if it is assumed that there is a 95% probability that the value will be at least 64?
There is concern about the percent of on-time flights. A recent survey of two major airlines yielded the following results. At α = 0.05 test the claim that there is a difference in proportions of on-time flights.
The house of representatives has a very controversial bill that will be going to vote. To help formulate his strategy on how to get the bill passed, the chairman of the committee that has been studying the bill wishes to know if there is a divisio..
Explain can you find out statistical support in this poll for that statement. When it comes to the war in Iraq, among which of the subsiquent statements comes closer to your point of view.
The participants in a television quiz show are picked from a large pool of applicants with approximately equal numbers of men and women.
When is a regression equation used? What terms describe the fit of a regression equation to the data? What is the importance of the coefficient of determination (r2)?
Assume that a 95% confidence interval for the mean is 14.5
Do you think this statement has any merit? Why or why not? Explain why the manager may have said it and then further substantiate his argument or compose a rebuttal.
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