Name:ID: A8. An experiment is conducted to sce if learning while using an online website is as effective as leamingfrom a teacher who is lecturing. Fifty college students volunteer and will be randomly placed into twogroups. One group of voluntcers will be given a lesson online and the qther group will have a teacherexplain the lesson. After the lcsson, a test will be given to sec which group, on average, scores higher.What is the purpose of random assignment in the context of this experiment?So that both groups will have exactly twenty-five voluntcers.b.a.So that both groups of voluntcers are roughly cquivalcnt at the beginning of theexperiment.So that if there are many voluntcers that prefer leaming online, thcy will be all beplaced into the same group.d So that if two of the voluntcers know each other, they will be split into differentc.groups.ffect the choire of snack a person cats. Twenty

Random assignment means the probability / chances of getting selected in either of the groups are…

Answered: 8. An experiment is conducted to sce if…

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 coffee shop gets its stock of bagels for the day delivered from a baker in the morning before opening. Suppose they need to sell 250 bagels every day to break even on their purchase of bagels from the baker. The store manager, when closing the store for the night, notices that many bagels are left unsold and fears they are not breaking even. Rather than using anecdotes, the store manager decides to collect some data. 42 days are randomly sampled and the number of bagels sold in that day is measured. The sample mean is found to be 240 bagels with a standard deviation of 30 bagels. Are they losing money selling bagels? Let μ be the true number of bagels sold in a day. Test this at claim at the α= 0.01 level. (a) Set up the null and alternative hypothesis (using mathematical notation/numbers AND interpret them in context of the problem) (b) Calculate the test statistic (c) Calculate the critical value
A coffee shop gets its stock of bagels for the day delivered from a baker in the morning before opening. Suppose they need to sell 250 bagels every day to break even on their purchase of bagels from the baker. The store manager, when closing the store for the night, notices that many bagels are left unsold and fears they are not breaking even. Rather than using anecdotes, the store manager decides to collect some data. 42 days are randomly sampled and the number of bagels sold on that day is measured. The sample mean is found to be 240 bagels with a standard deviation of 30 bagels. Are they losing money selling bagels? Let μ be the true number of bagels sold in a day. Test this at claim at theα= 0.01 level. (a) Set up the null and alternative hypothesis (using mathematical notation/numbers AND interpret them in the context of the problem) (b) Calculate the test statistic (c) Calculate the critical value (d) Draw a picture of the distribution of the test statistic underH0. Label and…
A crossover trail is a type of experiment used to compare two drugs. Subjects take one drug for a period of time, then switch to the other. The responses of the subjects are then compared using matched pair methods. In an experiment to compare two pain relievers, seven subjects took one pain reliever for two weeks, then switched to the other. They rated their pain level from 1 to 10, with larger numbers representing higher levels of pain. The results are listed below. Can you conclude that the mean pain level is more with drug B? Use the 0.05 level and the p- values method.
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A website invited women to visit its site to complete a survey, and 1500 respondent responses were recorded. When asked whether they would rather have more money or more sleep; 88% responded more money and 12% responded more sleep. 1) Identify the variable in this study. 2) What is the sample in this study? 3) What is the implied population?
Many people like to play app based games on their mobile devices. Suppose we would like to estimate the proportion of students that have played an app-based game on their mobile device in the last month at CSU Stan. In order to do this, we take a random sample of 225 students and ask them if they have played an app-based game in the last month. Of those sampled, 198 responded that they have played an app-based game in the last month. Which of the following is the correct 99% confidence interval for the estimate of the proportion of all CSU Stan students that have played an app-based game in the last month? O [82.42%, 93.58%] O [6.42%, 17.58%] [83.75%, 92.25%] O [84.44%, 91.56%]
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The P&G marketing team has created two potential slogans for the new Smile toothpaste. The uplifting slogan is, “Smile when you buy Smile!”. The serious slogan is, “Buy Smile to keep your smile.” Before deciding which slogan to use, the marketing team runs an experiment to see how individuals respond to these two slogans. The marketing team recruits 46 people to participate in this experiment, randomly assigning 24 participants to read the uplifting slogan and 22 participants to read the serious slogan. After reading the slogans, all participants rate how likely they are to buy the new Smile toothpaste on a scale from 1 (definitely will NOT purchase) to 10 (definitely will purchase). The group of participants who read the uplifting slogan has a mean score of 6.67, with a sum of squares of 323. The group of participants who read the serious slogan has a mean score of 4.77, with a sum of squares of 221. Do participants who read the uplifting slogan versus the serious slogan differ…

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