The Internal Revenue Service (IRS) determines which income tax returns to audit by looking at, among other things, whether there are any unusual deductionsclaimed on the return. The IRS has data from last year regarding the mean and standard deviation of charitable deductions for a family of four. The IRS wishesto know whether the standard deviation this year is still about the same as it was last year. To get a rough initial idea, the IRS randomly selects 75 income taxreturns for families of four from this year's tax filings. The charitable deductions claimed on the returns are summarized in the following histogram.Frequency2520-15-10-5+0HH19005102520100011001200Charitable deduction (in dollars)X130015Based on this histogram, estimate the standard deviation of the sample of 75 deduction amounts.Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place.(If necessary, consult a list of formulas.)1400

The given information from the graph is:Class IntervalFrequency…

Answered: The Internal Revenue Service (IRS)…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A clerk entering salary data into a company spreadsheet accidentally put an extra "o" in the boss's salary, listing it as $1,000,000 instead of $100,000. Explain how this error will affect these summary statistics for the company payroll. Choose the correct answer: O Assuming the boss's true salary is above the median, the median will stay the same. The mean will be too large. O The median and the mean will be too large. O The median will be too small and the mean will be too large. O Assuming the boss's true salary is above the median, the median will be the same. The mean will be too small. Choose the correct answer: O The IQR will likely stay the same. The standard deviation will be too large. O The IQR will likely be too large. The standard deviation will be too small. O The IQR will likely be too large. The standard deviation will be too large. O The IQR will likely be too small. The standard deviation will bg too small.
Answer the three following questions a, b, and c. Taxes: The Internal Revenue Service reports that the mean federal income tax paid in the year 2010 was $8040. Assume that the standard deviation is $4700. The IRS plans to draw a sample of 1000 tax returns to study the effect of a new tax law.
From the states data set, get the descriptive statistics for the violent crime rate. For this assignment, you will need the mean, standard deviation, five-number summary (minimum, 25th percentile, median, 75th percentile, maximum), and interquartile range. Submit all answers as whole numbers--no decimal points. If you have to calculate the interquartile range by hand, you may calculate it using whole numbers as the 25th and 75 percentile. How would i calculate this?
The following are the annual incomes (in thousands of dollars) for 9 randomly chosen, U.S. adults employed full-time: 68, 68, 44, 82, 63, 75, 51, 90, 68 Send data to calculator (a) What is the median of this data set? If your answer is not an integer, round your answer to one decimal place. (b) What is the mean of this data set? If your answer is not an integer, round your answer to one decimal place. zero modes (c) How many modes does the data set have, and what are their values? Indicate the number of modes by clicking in the appropriate circle, and then indicate the value(s) of the mode(s), if applicable. one mode: two modes: |and ||
Over the first five years of owning her car, Gina drove about 12,700 miles the first year, 15,478 miles the second year, 12,675 the third year, 11,850 the fourth year, and 13,075 the fifth year. a. Find the mean, median, and mode of this data. b. Explain which measure of central tendency will best predict how many miles Gina will drive in the sixth year. a. mean= 12,700; median= 13,156; no mode; the mean is the best choice because it is representative of the entire data set. b. mean= 13,156; median= 12,700; mode= 3,628; the median is the best choice because it is not skewed by the high outlier. c. mean= 13,156; median= 12,700; no mode; the mean is the best choice because it is representative of the entire data set. d. mean= 13,156; median= 12,700; no mode; the median is the best choice because it is not skewed by the high outlier.
An Internet retailer would like to investigate the relationship between the amount of time in minutes a purchaser spends on its Web site and the amount of money he or she spends on an order. The table to the right shows the data from a random sample of
Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 254 feet and a standard deviation of 43 feet. Use your graphing calculator to answer the following questions. Write your answers in percent form. Round your answers to the nearest tenth of a percent. a) If one fly ball is randomly chosen from this distribution, what is the probability that this ball traveled fewer than 204 feet? P(fewer than 204 feet) = % b) If one fly ball is randomly chosen from this distribution, what is the probability that this ball traveled more than 216 feet? P(more than 216 feet) =
According to a Boston Globe story, only about 1 in 6 Americans have blue eyes, whereas in 1900 about half had blue eyes. (Source: Data from The Boston Globe on October 17, 2006.) a. For a random sample of 100 living Americans, find the mean and standard deviation of the proportion that have blue eyes. b. In a course you are taking with 100 students, half of the students have blue eyes. Would this have been a surprising result if the sample were a random sample of Americans? Answer by finding how many standard deviations that sample result falls from the mean of the sampling distribution of the proportion of 100 students who have blue eyes. c. In part b, identify the population distribution, the data distribution, and the sampling distribution of the sample proportion.
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