4. (Exam 1 Summer 2020) Use the preamble below to answer the questions that followAn experiment to gain a better understanding of the role of various substances in melting ice was runin 2004 by Edinson Cavani, a researcher, in a certain lab in Memphis, TN. For each observation, a 10 mlblock of ice was placed into water containing a given concentration of sugar, or salt, or a sugar andsalt mix. The melting time for the ice block was measured in seconds and then converted to minutes.The three factors of interest were shape of ice block (lozenge, cylinder, and cube), solute (sugar, salt,and equal mix of sugar and salt), and concentration (5%, 10% 15%, 20%).(a) What is the response(outcome) variable for this study?Answer:(b) How many unique treatment combinations are there? Suppose there were two replicates pertreatment combination, what is the total number of trials?i. Number of unique treatment combinationsii. Total number of trialsAnswer:Answer:(c) Would you say the experiment was run as a completely randomized design(CRD) or as a ran-domized complete block design(RCBD)? Support your answer with reason.Answer:(d) If the experiment had to be run in two labs with a different technician in each lab, whichdesign type would be more appropriate: a CRD or a RCBD? Briefly explain.Answer:

a) Response variable for the given experiment is melting time of ice cubes (in seconds or…

Answered: treatment combination, what is the…

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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Boris is teaching a math course to 180 incoming students. He is interested in comparing his effectiveness teaching this course using activity-based learning to his effectiveness teaching this course using textbook presentation. He gives each of his students a pretest and forms two groups of 90 students each. To help make sure that the groups are similar in composition with respect to factors such as age, math ability, and test anxiety, the students are randomly assigned into the two groups. One of the two groups is randomly assigned to be taught by Boris using the activity-based learning approach for the duration of the course, and the other group will be taught by Boris using textbook presentation for the duration of the course. At the end of the course, Boris will test all of the students again with a posttest, and he will examine the increase in test score from the pretest to the posttest for each group. a.) First choose whether the procedure described above is an observational…
Answer the given problem. Use the steps in hypothesis testing when presenting the results. A health researcher is interested in comparing 3 methods of weight loss: low calorie diet, low fat diet and high exercise regimen. He selected 15 moderately overweight subjects and randomly assigned 5 to each weight-loss program. The following weight reductions (in lbs) were observed after a one-month period. Test the hypothesis that the extent of weight reduction does not differ by type of weight-loss program. Low Fat : 7 7 5 4 6 Low Calorie : 7 8 8 9 5 High Exercise Regimen : 7 9 7 8 8
In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests." The article says that the overall statewide proportion of school buses that fail safety tests is 9%. However, one bus companyhas a higher rate of over 12%. Assume that we want a new estimate for the statewide proportion of school buses that fail the safety inspection. We take a sample of 200 buses and find that 20 buses fail the safety inspection. What is the sample proportion of buses that fail the test? (Enter your answer as a decimal fraction between 0 and 1, e.g. .27)
Sally, a recent graduate of the University of Arkansas, accepted a position as an event coordinator for a major marketing firm. Sally's first task is to organize a convention of retailers and manufactures of private label store brands. She wants to select a city that has low hotel cost. She has narrowed her choice to Atlanta and New Orleans. She collects sample data on 25 hotels in both cities for a 5 night stay. Since there is a vast amount of historical data for hotel prices in both cities, she finds the known variance to be $125 in Atlanta and $150 in New Orleans. Can she conclude that there is a difference in hotel cost between the two cities? If there is a difference, she will use that information and select the city with the lower cost. The level of significance is .10. If appropriate, you should assume unequal variances. z-Test: Two Sample for Means t-Test: Two-Sample Assuming Unequal Variances Atlonta New Orleons Atlonta New Orleons Mean 1629.90476 181154879 Мean 1629.90476…
A study took one hundred 55-year-old males and divided them into two groups. The first group was given one-on-one financial planning training once per week for 3 months. The second group was given an online training once per week for 3 months. At the end of the study, both groups were given examinations to determine how much of the training was remembered and the results were compared. What type of research method is this? O an observational study O a census O a survey O an experiment
Can you do a, b, c?
An electronics company wants to compare the quality of their cell phones to the cell phones from three competitors. They sample 10 phones from each company and count the number of defects for each phone. If ANOVA was used to compare the average number of defects, then the treatments would be defined as Select one: a the four companies b.None is correct c.the average number of defects d.the total number of phones O e.the number of cell phones sampled
I need help on figuring out how my instructor is getting his answers. Mainly on how the got the success/failure data out of the below information on this group worksheets. 1.) In 2019, the poverty rate in the U.S. was 10.5%. A local official wants to test whether their county has a different poverty rate than the rest of the U.S. In a random sample of 2000 county residents, 9.3% were below the poverty level. a.) Perform a hypothesis to determine wheather there is evidence that the county's rate is significantly different than the national rate. b.) Create a 95% confidence interval and compare with Po(null). Do the results of the hypothesis test agree with the confidence interval?
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During the 2004 senatorial campaign in a large southwestern state, illegal immigration was a major issue. One of the candidates argued that illegal immigrants made use of educational and social services without having to pay property taxes. The other candidate pointed out that the cost of new homes in their state was 20–30% less than the national average due to the low wages received by the large number of illegal immigrants working on new home construction. A random sample of 5,500 registered voters was asked the question, “Are illegal immigrants generally a benefit or a liability to the state’s economy?” The results were as follows: 3,500 people responded “liability,” 1,500 people responded “benefit,” and 500 people responded “uncertain.” a. What is the population of interest? b. What is the population from which the sample was selected? c. Does the sample adequately represent the population? d. If a second random sample of 5,000 registered voters was selected, would the results be…
K Contrast bath treatments use the immersion of an injured limb alternately in water of two contrasting temperatures. Those who use the method claim that it can reduce swelling. Researchers compared three treatments: (1) contrast baths and exercise, (2) contrast baths alone, and (3) exercise alone. They report the boxplots to the right, (... Change in Volume (cc) 40- 20- 0- -20- -40- O HH • HTH TH Treatment 3 a) The researchers conclude that the differences were not statistically significant. Explain what that means in context. Q o OA. There is no evidence that the changes in swelling were different among the three treatments. The experiment should be run again with more subjects. OB. There is evidence that the changes in swelling were different among the three treatments, but not enough data to tell which treatment was most effective. All three treatments appear to cause an unknown but unequal reduction in swelling. OC. There is no evidence that the changes in swelling were different…
Pick the Test (Z-test, Single Sample T-test, Independent Sample T-test, Paired Sample Ttest, ANOVA): 7. The designs of controls and instruments affects how easily people can use them. A student project investigated this effect by asking 16 right-handed students to turn a knob (with their right hands) that moved an indicator. There were two identical instruments, one with a right-hand thread (the knob turns clockwise) and the other with a left-hand thread (the knob turns counterclockwise). Each of the 16 students used both instruments in a random order. The time it took them to move the indicator a fixed distance using each of the knobs was measured. Test: _________

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