6.A certain test preparation course is designed to help students improve their scores onthe LSAT exam. A mock exam is given at the beginning and end of the course todetermine the effectiveness of the course. The following measurements are the netchange in 4 students' scores on the exam after completing the course:12, 7, 13, 11Using these data, construct a 80% confidence interval for the average net change in astudent's score after completing the course. Assume the population is approximatelynormal.Step 1. Calculate the sample mean for the given sample data. Round your answer to onedecimal place.Answer:Step 2. Calculate the sample standard deviation for the given sample data. Round youranswer to one decimal place.Answer:Step 3. Find the critical value that should be used in constructing the confidenceinterval. Round your answer to three decimal places.Answer:Step 4. Construct the 80% confidence interval. Round your answer to one decimalplace.

Given that the measurements of the net change in 4 students score on the exam after completing the…

Answered: 6. A certain test preparation course is…

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 researcher wants to investigate how happiness is affected by whether or not people meditate and whether or not they do yoga. The researcher recruits 20 people to participate in the study. They randomly assign the participants to one of the following conditions: 1) no meditation and no yoga, 2) no meditation and yoga, 3) meditation and no yoga, or 4) meditation and yoga. Each condition has five participants. At the end of the day, the researcher measured the participants' happiness on a 12-point scale. The results are shown below: No Yoga Yoga Source Between Column 1. Using the information provided in the table above, calculate the values corresponding to the numbers in the source table below. Only calculate the values in cells with a question mark in them. Round your answer to two decimals Row Interaction Within No Meditation 6, 6, 5, 7, 6 (M= 6) 3, 5, 3, 5, 4 (M = 4) MNOMeditation=5 Total SS ? ? ? ? 30 df ? ? ? Meditation 10, 12, 8, 9, 11(M = 10) 4, 4, 4, 1, 7 (M= 4) MMeditation = 7…
13) Prior to a set of compensation policy changes at a company 30% of the employees surveyed said that they liked their job very much, 50% said that they liked their job moderately, and the remaining employees said that they were dissatisfied with their job. Now, in a survey of 200 employees, 76 said they liked their job very much, 105 said that they liked their job moderately, and the remaining employees said that they were dissatisfied with their job. When testing (at the 5% level of significance) whether the proportions have changed, what is the null and alternative hypotheses? *please write out the null and alternative hypotheses below AND on scratch work*
14) Prior to a set of compensation policy changes at a company 30% of the employees surveyed said that they liked their job very much, 51% said that they liked their job moderately, and the remaining employees said that they were dissatisfied with their job. Now, in a survey of 191 employees, 59 said they liked their job very much, 107 said that they liked their job moderately, and the remaining employees said that they were dissatisfied with their job. When testing (at the 5% level of significance) whether the proportions have changed, what is the test statistic? *please round your answer to 3 decimal places*
At Conner Company, a custom manufacturer of printed circuit boards, the finished boards are subjected to a final inspection prior to shipment to its customers. As Conner’s quality assurance manager, you are responsible for making a representation to management on quality problems at the beginning of each month. Your assistant has analyzed the reject memos for all the circuit boards that were rejected during the past month. He has given you a summary statement listing the reference number of the circuit board and the reason for rejection from one of the following categories: A = Poor electrolyte coverage; B = Improper lamination; C = Low copper plating; D = Plating separation ; E = Improper etching For 50 circuit boards that had been rejected last month, the summary statement showed the following: C B C C D E C C B A D A C C C B C A C D C A C C B A C A C B C C A C A A C C D A C C C E C C A B A C Prepare a tally sheet (or checklist) of the different reasons for rejection. What is the…
6. Getting the teacher to show up Elementary schools in rural India are usually small, with a single teacher. The teachers often fail to show up for work. Here is an idea for improving attendance: Offer the teacher better pay for good attendance. Give the teacher a digital camera with a tamper- proof time and date stamp, and ask a student to take a photo of the teacher and class at the beginning and end of the day to verify attendance. Will this work? Researchers obtained permission to use 120 rural schools in Rajasthan for an experiment to find out. Explain why it is necessary to include a control group that doesn't get a financial incentive.4⁹
You are planning to estimate whether voter-protection laws increase voter turnout. You note that, in 2015, a lotof new voter-protection laws were enacted in some provinces but not in others. Conveniently, no new lawswere enacted in 2012, 2014, or 2016, so you decide to use 2012 and 2014 as your “before” periods and 2016 as“after”.a) Which of the following best describes what you’d want to regress state-and-year level “voter turnout”measures on?i. An indicator for whether the state is treated, and an indicator for whether the year is 2016.ii. A set of fixed effects for state, and a set of fixed effects for year.iii. An indicator for whether the state is treated, a set of fixed effects for year, and an indicator forwhether the state is currently treated.iv. A set of fixed effects for state, and for year, and an interaction between “is 2016” and “is atreated state”.v. This design should not be estimated using a regression.b) Unless you chose the final option in the previous question,…
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4. In a survey of families in which both parents work, one of the questions asked was, “Have you refused a job, promotion, or transfer because it would mean less time with your family?" 29% of the 205 men asked this question responded yes, while 24% of the 211 women asked responded Test the claim that a greater proportion of men have refused a job, promotion, or transfer yes. because it would mean less time with their family.
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Q1) A computer system uses passwords that are five characters, and each character is one of of the 26 letters (a-z) or 10 integers (0-9). The first character has to be a letter. You may assume that passwords are not case sensitive. Determine:(a) the total number of possible passwords (b) the proportion of passwords that begin with a consonant;(c) the proportion of passwords that end with an even number (0,2,4,6,8); (d) the proportion of possible passwords begin with a consonant OR end with an even number (OR both) hint: use the addition law of probability: P(A U B) = P(A) + P(B) - P(A ∩ B)(e) if a password was selected at random, what is the probability the password would read the same backwards as forwards? (f) solve (e) by making a simulation in R i.e. write some code to generate lots of passwords using the sample function, and count how many time you get a palindromic password. You will want to get a large number of samples here for to generate an accurate estimate (i.e. 100,000).
5. In 2006, tenis introduced a challenge system in which a player can challenge a decision as to whether a tennis ball was correctly called 'in’ or ´ouť by an official. In the 2015 U.S. Open Tennis Championship there were a total of 850 player challenges between both the Men's and Women's Singles matches. These challenges were determined either to be correct (meaning the player was correct and the umpire was incorrect) or incorrect (meaning the player was incorrect and the umpire was correct). These 850 challenges are summarized in the table below. Player Challenge Men's Women's Correct 153 72 Incorrect 394 231 (a) Calculate the proportion of all challenges that were determined to be correct. (b) Using these data as a representative sample of all player challenges in professional tennis, a 95% confidence interval for the difference in the proportion of men's and women's challenges that are determined to be correct (men – women) was found to be 0.04 ± 0.06. All conditions for inference…

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