It is common to think that the more education anindividual receives, the higher the person's incomeis likely to be. Does this idea translate to states? The following data represent the percentage ofthe population that has at least a bachelor s degree and the per capita personal income for a randomsample of states. Test the claim that states with a higher percentage of the population with at leasta bachelor's degree have a higher per capita personal income at the 0.05 level of significance.DataPercentage of Population withatLeast a Bachelor's DegreePer Capita PersonalIncome (Dollars)StateArkansas17.424,289California29.833,749Iowa24.629,043Louisiana22.326,100Maine23.728.831Nebraska26.830,758Ohio25.029,944Oregon26.429.340Texas24.729,372Source: Statistical Abstract of the United States, 2004

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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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B. Using data from the 2016 General Social Survey, you wish to understand whether men and women are equally likely to believe that grown children should move back with their parents. The below table shows the crosstab of these two variables using column percentages, with further statistical information reported below. Should grown children move back with parents A good idea A bad idea It depends Total Respondents sex Male 85 39.35 90 41.67 41 18.98 216 100.00 Pearson's chi2(2) = 10.7158 Pr = 0.005 Cramer's V = 0.1548 Female 1.07 46.32 63 27.27 61 26.41 231 100.00 Total 192 42.95 153 34.23 102 22.82 447 100.00
A. The researcher is interested in assessing if there is a relationship between primary time spent at work and energy level for the population of all full-time employees. Will a Goodness of fit test or test of independence be performed by the researcher? B. If there is NO relationship between primary time spent at work and energy level for the population of all full-time employees, what is the mean of the test statistic? C. Does there appear to be a relationship between primary time spent at work and energy level for the population of all full-time employees? (Make sure to think about the reasoning behind your answer.)
Students at Dover Community College have a mean credit card debt of $4,700 with a median of $2,900. Students at Ralton Community College have a mean credit card debt of $2,100 with a median of $1,900. Which of the following statements are true based on this information? There may be more than one correct answer. i. No more than half of Ralton students have debt more than $1,900. ii. The total debt of Ralton students is more than the total debt of Dover students. iii. The largest debt of the Ralton students is less than the largest debt of the Dover students. iv. About one-fourth of Ralton students have debt more than $2,100. v. Less than half of Dover students have debt more than $4,700.
An issue of Time Style and Design reported on a poll conducted on the shopping habits of wealthy Americans. A total of 603 interviews were conducted among a national sample of adults with household incomes of at least $150,000. Of the adults interviewed, 410 said they had purchased clothing, accessories or books online in the past year. We want to understand the percentage of wealthy Americans who shop online. Do the data provide sufficient evidence to say that the majority (more than 50%) of wealthy Americans shop online at the 5% significance level? a. What are n, x, n-x and ??̂? b. State the null and alternative hypotheses. c. What is the value for the test statistic z0? d. Find the p-value. e. Do the data support that (more than 50%) of wealthy Americans shop online?
Results from the 2015 IPEDS Report indicate that about 1 out of 25 students at Mohawk Valley Community College identify themselves as being of Asian descent. Which of the following choices is the best estimate for the percentage of students at MVCC who identify themselves as of Asian descent? 0.4% 2.5% 0.04% 4% 25% 0.25%
3. A Bloomberg Businessweek North American subscriber study collected data from a sample of 2861 sub-scribers. Fifty- nine percent of the respondents indicated an annual income of $ 75,000 or more, and 50% reported having an American Express credit card. a. What is the population of interest in this study? b. Is annual income a categorical or quantitative variable? c. Is ownership of an American Express card a categorical or quantitative variable? d. Does this study involve cross- sectional or time series data? e. Describe any statistical inferences Bloomberg Businessweek might make on the basis of the survey. 4. Table 1.8 shows a data set containing information for 25 of the shadow stocks tracked by the American Association of Individual Investors. Shadow stocks are common stocks of smaller companies that are not closely followed by Wall Street analysts. The data set is also on the website that accompanies the text in the file named Shadow02. a. How many variables are in the data set?…
Find the (a) mean, (b) median, (c) mode, and (d) midrange for the data and then (e) answer the given question. Listed below are the jersey numbers of 11 players randomly selected from the roster of a championship sports team. What do the results tell us? 80 54 22 46 18 28 36 5 51 66 O a. Find the mean. The mean is (Type an integer or a decimal rounded to one decimal place as needed.) b. Find the median. The median is (Type an integer or a decimal rounded to one decimal place as needed.) c. Find the mode. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The mode(s) is(are) (Type an integer or a decimal. Do not round. Use a comma to separate answers as needed.) O B. There is no mode. d. Find the midrange. The midrange is. (Type an integer or a decimal rounded to one decimal place as needed.) e. What do the results tell us? O A. The jersey numbers are nominal data and they do not measure or count anything, so the resulting statistics…
The following table shows the cross-classification of accounting practices (either straight line, declining balance, or both) and country (either France, Germany, or United Kingdom). France Germany United Kingdom Straight Line 20 11 30 Declining Balance 14 16 15 Both 15 23 13 Set up the competing hypotheses to determine if accounting practice and country are dependent. What is the degrees of freedom for the test. Calculate the value of the test statistic (Square of x).
You saw back in Chapter 2 that the mean, median, mode, and midrange are used to indicate where data is centered in a data set, or in other words what a typical value in the set is. A question that is often asked is, "If they're all supposed to do the same thing, why is there more than one?" Isn't one enough? In this exercise, you will be given two small sets of data. For each set, a. find the mean, median, mode and midrange b. in your opinion, decide which of the measures BEST represents all the values in the set (best indicates a typical value), and which one does this the WORST. c. post your responses and justify them by explaining why Don't forget to respond to at least one of your classmate's posts. With this exercise, "more is better." I'll elaborate after the deadline. • Set A: the salaries of 10 employees at a company (in thousands of dollars): 50, 50, 50, 50, 50, 50, 50, 50, 50, 500 • Set B: the grades of 9 students on an exam: 20, 25, 30, 35, 40, 45, 100, 100, 100
Solve each given problem using the appropriate test statistic. 1. A survey of public opinion about the criminal justice system asked respondents to complete the following statement: "The criminal justice system treats offenders...." The researchers found the following distribution of responses by gender of the respondent: Gender of Respondent Too Lenient About Right Too Harsh Female 15 50 35 Male 40 35 25 a. Is there a relationship between the gender of the respondent and perceptions of punishment severity? Use a 5% level of significance and outline each of the steps required in a test of statistical significance. b. Would your answer be different if the significance level were 0.01? Show the proof of your answer. c. What can you conclude about the relationship between gender and perceptions of punishment severity?
A research poll included 1614randomly selected adults who were asked whether "global warming is a problem that requires immediate government action." Results showed that 972 of those surveyed indicated that immediate government action is required. A news reporter wants to determine whether these survey results constitute strong evidence that the majority (more than 50%) of people believe that immediate government action is required. Complete parts (a) through (c) below. a. What is the best estimate of the proportion of adults who believe that immediate government action is required? the best estimate is ?
A business reports that their average salary is over $91,000, the simple mean of the salaries listed in the chart. Alternatively, instead of a simple mean, the business could report the median, or the mode. Which would be the most useful to someone deciding whether to apply for an entry level job at this business? Job Number of Employees Salary Line workers 10 $30,000 Office manager 1 $45,000 CEO 1 $200,000 Select one: a. Simple mean is best b. Simple mean and median are nearly equal numerically. They are equally good for this purpose and better than the other options. O c. Simple mean and mode are equally good for this purpose and better than the other options. d. Median and mode are about equally good for this purpose and better than other options.

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