In one study, the correlation between the educational level of husbands and wives in a certain town was about 0.5; each averaged 12 years of schooling completed, with an SD of 3 years.a. Predict the educational level of a woman whose husband completed 18 years of schooling.Answer (to the nearest 0.1 years):b. Predict the educational level of a man whose wife completed 15 years of schooling.Answer (to the nearest 0.1 years):c. Apparently, well-educated men marry women who are less well educated than themselves, on average. But women with above average education marry men with even less education, on average. Is this a contradiction? Answer: ?

Given that: Sample means of men and women: x¯=y¯=12 Standard deviation of men and women: sx=sy=3…

Answered: In one study, the correlation between…

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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For each of the following, indicate the scale of measurement that best describes the infor mation.a. In 2008, Dell Corporation had approximately 78,000 employees.b. USA Today reports that the previous day’s highest temperature in the United States was 105 degrees in Death Valley, California. Source: USA Today, June 19, 2009, p. 12A.c. An individual respondent answers “yes” when asked if TV contributes to violence in the United States.d. In a comparison test of family sedans, a magazine rates the Toyota Camry higher than the VW Passat.
For each of the following, indicate the scale of measurement that best describes the information.a. In 2008, Dell Corporation had approximately 78,000employees. b. USA Today reports that the previous day’s highest temperature in the United States was 105 degrees in Death Valley, California. c. An individual respondent answers “yes” when asked if TV contributes to violence in the United States. d. In a comparison test of family sedans, a magazine rates the Toyota Camry higher than the VW Passat
11 of 16 Angela has a monthly gross income of $3,000 and her expenses are $1,200. What is her back-end ratio? II
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Would pettys team sample data support the claim that the life of goodbar tries has increased from 2,200 mile figure using a 0.05 level of signifigance
An automotive manufacturer wants to know the proportion of new car buyers who prefer foreign cars over domestic. Step 1 of 2 : Suppose a sample of 1217 new car buyers is drawn. Of those sampled, 267 preferred foreign over domestic cars. Using the data, estimate the proportion of new car buyers who prefer foreign cars. Enter your answer as a fraction or a decimal number rounded to three decimal places.
A certain basketball team makes 70% of its free throws on average. In a game where the team shoots 40 free throws. what is the approximate probabillity that the number of free throws made by the team wilbe at least 25%
Arsenic is toxic to humans and people can be exposed to it through contaminated drinking water, food, dust, and soil. Scientists have devised a non-invasive way to measure a person's level of arsenic poisoning: by examining toenail clippings. In a recent study, scientists measure the level of arsenic (in mg/kg) in toenail clippings of 8 people who lived near a former arsenic mine in Great Britain. The following levels are recorded. 0.8, 1.9, 2.7, 3.4, 3.9, 7.1, 11.9, 26.0 Below are the summary statistics of the data. min Q1 median Q3 max sd n mean 0.8 2.5 3.65 8.3 26 7.2125 8.368041 8 Suppose the 8 people examined were randomly sampled from residents near the former arsenic mine. Is it legitimate to construct a 95% confidence interval for the mean level of arsenic (in mg/kg) in toenail clippings for residents near the former arsenic mine using a t-distribution? Explain briefly.
Suppose a study of speeding violations and drivers who use cell phones produced the following fictional data: Speeding violation in thelast year No speeding violation in the last year Total Uses cell phone while driving 25 280 305 Does not use cell phone while driving 45 405 450 Total 70 685 755 Calculate P(Driver had no violation in the last year AND was a cell phone user). Round your answer to four decimal places.
The state education commission wants to estimate the fraction of tenth grade students that have reading skills at or below the eighth grade level. Step 2 of 2: Suppose a sample of 310 tenth graders is drawn. Of the students sampled, 46 read at or below the eighth grade level. Using the data, construct the 85% confidence interval for the population proportion of tenth graders reading at or below the eighth grade level. Round your answers to three decimal places.
A population data set produced the following information. N = 250. Ex = 9980, Ey = 1455, xy = 85,040 E2 = 486,820, and = 136,745 Find the values of oe and p?. Round oe to four decimal places and p? to three decimal places. i

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