4. In a study, experimenters printed up copies of fakeapplication materials for a science lab manager job. Allcopies of the application materials were completelyidentical, except for one thing: the name. On about half ofthe copies, the application listed the name "John." Theother half had the name "Jennifer." Experimenters found127 science lab faculty members and randomly sent themeither a "John" (n=63) or "Jennifer" (n = 64) application.Each faculty member was told that the application was for areal position at their University. The faculty membersindependently rated the applicant's "hireability" (1-7 scale)and estimated their starting salary. Experimenters comparedthese results across the two groups.Here's an estimated summary of the Jenn/John study results:Starting Salary Average$30,238.09$35,000$30,000$25,000$20,000$15,000$10,000$5,000John$26,507.94Jennifer10Average Hireability Rating3.78John2.93Jennifera. Is this study an experiment or observational study?b. What are the experimental units?c. What is the explanatory variable?d. What is/are the treatment(s)?e. What is the response variable?

This question presents a study conducted by experimenters to investigate the impact of gender bias…

Answered: 4. In a study, experimenters printed up…

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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Suppose that in a survey of five-year-olds, 49%49% liked the letter A, 56% liked the letter B, and 53% liked the letter of C. 29% liked A and B 29% liked A and C, 32% liked B and C, and 16% liked all of them. What percentage liked A and B but not the letter C?
Given a population of N=72, starting in row 29 of the table of random numbers, and reading across the row, select a sample of n=14 (Table Attached) For a population containing N=9834 individuals, what code number would be assigned for The eighth person on the list would be assigned code number? b.The eighty-eighth person on the list would be assigned code number? c.The last person on the list would be assigned code number?
For a school project, 3 students need to produce a sample of students at their school. Which of the following methods leads to a random sample? a Asking each of their friends to a a name 3 friends. b Writing all the names of students they know on a list and picking. c Numbering all the students at the school and produce a sample from a random list of numbers. d Calling for volunteers on social media.
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g) The Lady Tasting Tea Experiment. An English lady, Muriel Bristol, claimed that she can tell whether tea or milk was added first to a cup. So as a researcher, you want to test whether she can really tell whether tea or milk was added first. But how would you do it? A possible research design: Give her eight cups, four where tea is added first and the other four where milk is added first, in random order. Then ask her to pick out the four cups where the milk is added first. After you conducted the experiment and collected the data, how do you decide whether she can truly tell the difference or she was just guessing. Our intuition tells us that the more cups she gets correctly, the more likely that she is NOT guessing. "If the Lady is just guessing, the probability of getting it all correctly is 1.4%." Now using your knowledge on combinatorics and probability, explain how this number was calculated? h) Suppose you flip four fair coins. What is the probability that you will get all…
A random variable X can take integer values from 0 to 4 with probabilities {0.152,0.366,0.330,0.132,0.020}. What is the expected value of X^2 (X squared)? 6.0 O 1.5 O none of these O 3.2 O 2.0
Suppose we want to estimate the proportion of the Helena population who have used marijuana within the last month. We select 4328 participants and ask them each to first privately draw a card from a standard 52-card deck. If they get a “club” they are asked to respond truthfully to the question “Have you used marijuana within the last month?”If they get any other suit they are asked to respond to the question “Does your phone number end in an odd digit?”The study is blinded in the sense that the researcher doesn’t know which question the participant is answering. Hence, participants are guaranteed anonymity and are more likely to be truthful in their responses. The researchers only get a “yes” or “no” answer from each respondent and don’t know the actual results of the card draw. What is the expected probability of a person’s phone number ending in an odd digit? What is the expected probability of a person’s phone number not ending in an odd digit?
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A friend of mine is giving a dinner party. His current wine supply includes 7 bottles of zinfandel, 11 of merlot, and 13 of cabernet (he only drinks red wine), all from different wineries. (a) If he wants to serve 3 bottles of zinfandel and serving order is important, how many ways are there to do this? (b) If 6 bottles of wine are to be randomly selected from the 31 for serving, how many ways are there to do this? (c) If 6 bottles are randomly selected, how many ways are there to obtain two bottles of each variety? (d) If 6 bottles are randomly selected, what is the probability that this results in two bottles of each variety being chosen? (Round your answer to three decimal places.) (e) If 6 bottles are randomly selected, what is the probability that all of them are the same variety? (Round your answer to three decimal places.)
A group of 11 students was selected at random and asked for their high school GPA and their freshmen GPA in college the subsequent year. The results were: Student High School GPA Freshmen GPA 1 2.0 1.6 2 2.2 2.0 3 2.6 1.8 4 2.7 2.8 5 2.8 2.1 6 3.1 2.0 7 2.9 2.6 8 3.2 2.2 9 3.3 2.6 10 3.6 3.0 We would like to know whether there is a linear relationship between the high school GPA and the college freshmen GPA, and we would like to be able to predict the freshmen GPA, if we know that the high school GPA of another student is, say, 3.4. Provide the two requested scatter plots for this data (put college freshman GPA on the Y (vertical) axis!). a) What would be your approximate 95% prediction interval for question (g)? b) Show your scatterplot with the predicted trend line below

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