Determine whether the study is an experiment or an observational study, and then identify a major problem with the study.A sociologist has created a brief survey to be given to 2000 adults randomly selected from the U.S. population. Here are her first two questions: (1) Have you ever been the victim of a felony crime? (2) Have you ever been convicted of afelony?This is an observational study because the researcher does not attempt to modify the individuals.What is a major problem with the study?O A. The responses will be voluntary, which will lead to a high chance of bias.O B. The sample includes only U.S. adults.O C. There is no blinding or replication, which has a high chance of leading to bias.O D. Individuals convicted of a felony are more likely to not answer the second question honestly.

Answered: Image /qna-images/answer/89e0136a-5eba-40f9-8cb4-73a424b32241.jpg

Answered: Determine whether the study is an…

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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(c) Suppose that after looking at the data the researcher decided to test the research questions listed below. Conduct the appropriate tests to answer these questions. Report and fully interpret the results of each test conducted. On average: (iv) Do Asian students score significantly higher/lower than White students in Reading? race: 1 - hispanic, 2 - asian, 3 - black, 4 - white race RDG 1 34 1 47 1 42 1 39 1 36 1 50 1 63 1 44 1 47 1 44 1 50 1 44 1 47 1 42 1 42 1 47 1 60 1 39 1 57 1 73 1 47 1 39 1 35 1 39 1 48 1 31 1 52 1 47 1 36 1 47 1 34 1 52 1 42 1 37 1 44 1 71 1 47 1 42 1 42 1 47 1 52 1 52 1 39 1 31 1 60 1 47 1 39 1 42 1 47 1 42 1 36 1 50 1 34 1 55 1 28 1 42 1 44 1 60 1 39 1 36 1 44 1 39 1 39 1 42 1 42 2 52 2 65 2 42 2 47 2 52 2 44 2 52 2 47 2 65 2 63 2 60 2 47 2 65 2 53 2 68 2 55 2 39 2 52 2 65 2 52 2 57…
. A random sample of 1000 Americans was taken, and these adults were asked if experience in politics was necessary for a candidate to be president of America. The following table presents the results of the survey . Test at a 1% significance level whether gender and opinions are related. Necessary Not Necessary No Opinion Men 260 220 70 Women 230 180 40 Test at a 1% significance level whether gender and opinions are related.
Gallup World At its website (www.gallupworldpoll.com) the Gallup World Poll describes their methods.After one report they explained: Results are based on face-to-face interviews with ran-domly selected national samples of approximately 1,000 adults, aged 15 and older, who live permanently in eachof the 21 sub-Saharan African nations surveyed. Thosecountries include Angola (areas where land minesmight be expected were excluded), Benin, Botswana,Burkina Faso, Cameroon, Ethiopia, Ghana, Kenya,Madagascar (areas where interviewers had to walkmore than 20 kilometers from a road were excluded),Mali, Mozambique, Niger, Nigeria, Senegal, SierraLeone, South Africa, Tanzania, Togo, Uganda (the areaof activity of the Lord’s Resistance Army was excludedfrom the survey), Zambia, and Zimbabwe. . . . In allcountries except Angola, Madagascar, and Uganda,the sample is representative of the entire population.a) Gallup is interested in sub-Saharan Africa. What kindof survey design are they using? b) Some…
1. College students Suppose a recent study of 1,000 college students in the U.S. found that 8% of them do not use Facebook. Which of the following describes the population for this example? 2. A survey question that starts out with the phrase “Do you agree that...” is an example of what? 3. Which of the following defines what is meant by a control group in an experiment? 4. Which of the following studies can result in researchers extending the results inappropriately because the sample doesn’t represent the intended population?
A certain company will purchase the house of any employee who is transferred out of state and will handle all details of reselling the house. The purchase price is based on two assessments, one assessor being chosen by the employee and one by the company. Based on the sample of eight assessments shown, do the two assessors agree? Use the .01 level of significance. Assessments of Eight Homes ($ thousands) Assessed by Home 1 Home 2 Home 3 Home 4 Home 5 Home 6 Home 7 Home 8 Company 330 345 452 270 298 286 537 744 Employee 317 350 473 280 307 283 523 769 Click here for the Excel Data File (a) Choose the appropriate hypotheses. Assume d = company assessed value – employee assessed value. multiple choice 1 H0: μd = 0 versus H1: μd ≠ 0. H0: μd ≠ 0 versus H1: μd = 0. (b) State the decision rule for .01 level of significance. (Round your answers to 2 decimal places. A negative value should be indicated by a minus sign.) Reject the null hypothesis if tcalc < or…
American businesses provide?" The distribution of responses to this question was as follows: Excellent 8% Pretty good 47% Only fair 34% Poor 11% Suppose a store manager wants to find out whether the results of this consumer survey apply to customers of supermarkets in his city. To do so, he interviews 207 randomly selected customers as they leave the supermarkets in various parts of the city as to their rating of service. Following is the number of responses and distribution of this survey: Excellent 21 Pretty good 109 Only fair 62 Poor 15 Please answer the following: Determine whether the observed frequencies of responses from this survey are statistically the same as the frequencies that would be expected on the basis of the national survey. Hint: Think goodness-of-fit. Also, check out my attachment. Can you describe a chi-squared application, either goodness-of-fit or test-for-independence, in your…
I. In the following study educational researchers were interested in whether a New Method for teaching mathematics was more effective than the Standard Method. A sample of 20 students were taught by the Standard Method, while another sample of 15 students were taught by the New Method. Each student was given a mathematics proficiency test at the end of the teaching period. The scores on this test are tabulated below: Standard 54.2 61.9 69.2 76.1 55.8 67.3 73.9 67.3 73.9 71.4 Method New Method 76.4 69.6 66.0 81.1 66.6 77.2 89.9 85.4 66.3 67.9 77.5 70.3 63.2 33.4 55.6 42.0 13.8 10.7 36.9 71.6 37.9 23.7 14.5 26.6 55.2 Some Summary Statistics are given below: Er Ex? Standard 20 Method New Method 1417.4 101932.70 15 632.9 33669.55
Texas A&M Administrators at Texas A&M Universitywere interested in estimating the percentage of students who are the first in their family to go to college. TheA&M student body has about 46,000 members.a) What problems do you see with asking the followingquestion of students? “Are you the first member ofyour family to seek higher education?”b) For each scenario, identify the kind of sample used bythe university administrators:i. Select several dormitories at random and contacteveryone living in the selected dorms.ii. Using a computer-based list of registered students,contact 200 freshmen, 200 sophomores, 200juniors, and 200 seniors selected at random fromeach class. iii. Using a computer-based alphabetical list of reg-istered students, select one of the first 25 on the list by random and then contact the student whosename is 50 names later, and then every 50 namesbeyond that. c) A professor teaching a large lecture class of 350 stu-dents samples her class by rolling a die.…
A certain company will purchase the house of any employee who is transferred out of state and will handle all details of reselling the house. The purchase price is based on two assessments, one assessor being chosen by the employee and one by the company. Based on the sample of eight assessments shown, do the two assessors agree? Use the .05 level of significance. Assessments of Eight Homes ($ thousands) Assessed by Company Employee Home 1 Home 2 Home 3 Home 4 Home 5 Home 6 Home 7 Home 8 325 345 455 279 292 281 539 747 312 350 480 287 304 284 521 770 picture Click here for the Excel Data File (a) Choose the appropriate hypotheses. Assume d= company assessed value – employee assessed value. Ho: Hd = 0 versus H: Hd # 0. Ho: Hd +0 versus H: Hd = 0. (b) State the decision rule for .05 level of significance. (Round your answers to 2 decimal places. A negative value should be indicated by a minus sign.) Reject the null hypothesis if tealc 2.36 (c-1) Find the test statistic tealc- (Round your…
According to a recent census, 15% of the people in the United States are of Hispanic origin. One county supervisor believes her county has a different proportion of Hispanic people than the nation as a whole. She looks at their most recent survey data, which was a random sample of 435 county residents, and found that 40 of those surveyed are of Hispanic origin. This is a one-proportion z test. Answer the following: A. ) The 435 residents were a random sample from the county of interest. The sample size is more than 100. One expects np0=(?) successes and nq0=(?) failures, which are both more than 10. B.) The 435 residents were a random sample from the county of interest. 435 is likely less than 10% of the population of a county. One expects np0=(?) successes and nq0=(?) failures, which are both more than 10. C.) The 435 residents were a random sample from the county of interest. The standard deviation of p is less than 0.5. One expects np0=(?) successes and…
Two pieces of information were gathered from 1212 randomly selected cities in the United States: the number of persons owning registered firearms and the murder rate. It was observed that cities with more registered firearms tended to have higher murder rates. Part A: Which is the population of interest in this study? People who own registered firearms in the United States Cities in the United States People who live in U.S. cities People who were murdered in the United States Part B: Which is the sample in this study? People who live in the 121U.S. cities People who own registered firearms in the 12 U.S. cities 12 cities in the United States People who were murdered in the 12 U.S. cities Part C: What type of study is this? A census, because it uses data from the entire population A statistical study, because it uses data from a sample Part D: Which of the following was not a variable observed in this study? The number of registered firearms in a given city Murder…

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