A study was designed "to determine if application of duct tape is as effective as cryotherapy (liquid nitrogen applied to the wart for 10 seconds every 2 to 3weeks) in the treatment of common warts." The researchers randomly divided 51 patients into two groups. The 26 patients in group 1 had their warts treatedby applying duct tape to the wart for 6.5 days and then removing the tape for 12 hours, at which point the cycle was repeated for a maximum of 2 months. The25 patients in group 2 had their warts treated by cryotherapy for a maximum of six treatments. Once the treatments were complete, it was determined that85% of the patients in group 1 and 60% of the patients in group 2 had complete resolution of their warts. The researchers concluded that duct tape issignificantly more effective in treating warts than cryotherapy. What is the research objective? What is the population being studied? What is the sample?What are the descriptive statistics? What are the conclusions of the study?E 三三X,Insert Formula

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Answered: A study was designed "to determine 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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Water loss: Human skin loses water through evaporation, and, in general, damaged skin loses water at a faster rate than undamaged skin. In a study in which the outer layer of skin on a small section of the forearm was partially removed, water loss (in g/m² per hour) was measured both before and after skin removal. The results for ten individuals were as follows: Subject Before After 1 15 21 2 11 25 13 27 16 27 13 18 3 4 5 6 7 18 9 10 Part: 0/2 15 Part 1 of 2 14 18 Sand data to Exce 15 16. 21 19 28 25 24 (a) Construct a 98% confidence interval for the mean increase in water loss. Let of represent the water loss after skin removal minus the water loss before bil do
A study was conducted by researchers to determine if application of duct tape is more effective than cryotherapy (liquid nitrogen applied to the word for 10 seconds every 2 to 3 weeks) in the treatment of common warts. The researchers randomly divided 40 patients into two groups. The 20 patients group 1 had their warts treated treated by applying duct tape to the wart for 6.5 days and then removing the tape for 12 hours, at which point the cycke was repeated, for a maximum of 2 months. The 20 patients in group 2 had their warts treated by cryotherapy for a maximum of six treatments. Once the treatments were complete, it was determined that 17 patients in group 1 (duct tape) and 11 patients in group 2 (cryotherapy) had complete resolution of their warts. (Source: Archives of pediatrics and adolescent medicines, 156(10), 2002. conduct a hypothesis test to address the research question whether application of duct tape is more effective than cyrotherapy in the treatment of common warts.…
A researcher wishes to try three different techniques to lower the blood pressure of individuals diagnosed with high blood pressure. Fifteen subjects are randomly assigned to three groups: the first group takes medication, the second group exercises, and the third group follows a special diet. Each group is assigned five subjects. After four weeks, the reduction in each person’s blood pressure is recorded. The data collected are shown in the table. Test the claim that there is no difference among means at α=0.05. Medication Exercise Diet 6 10 7 14 10 6 15 9 5 14 5 8 13 6 6 Proceed with the computations for Tukey Test assuming that it is viable to perform a post-hoc analysis. 1. Pairwise Comparison Test 1 Given the hypotheses: H0:μ1=μ2; Ha:μ1≠μ2 Compute for the Tukey's q-statistic. (4 decimals) ______________ 2. Pairwise Comparison Test 2 Given the hypotheses: H0:μ1=μ3 ; Ha:μ1≠μ3 Compute for the Tukey's q-statistic.(4 decimals) ______________ 3. Pairwise…
A series of tests of fire prevention sprinkler systems that use a foaming agent to quell the fire were performed to determine how long it took (in seconds) for the sprinklers to be activated after the detection of a fire by the system. The system has been designed so that the true average activation time is supposed to be at most 25 seconds. Do the data strongly indicate that the design specifications have not been met? The data for the test are given below: 27 41 22 27 23 35 30 33 24 27 28 22 24
1. Measurements of gastric secretion of hydrochloric acid (milliequivalents per hour) in 18 normal subjects and 15 subjects with duodenal ulcer yielded the following results:Normal subjects: 6.3, 2.0, 2.3, 0.5, 1.9, 3.2, 4.1, 4.0, 6.2, 6.1, 3.5, 1.3, 1.7, 4.5, 6.3, 6.2, 0.9, 3.3Ulcer subjects: 13.7, 20.6, 15.9, 28.4, 29.4, 18.4, 21.1, 3.0, 26.2, 13.0, 12.1, 13.7, 18.9, 12.3, 5.7Could you conclude that the average gastric secretion of hydrochloric acid in ulcer subjects is at least 15 units (milliequivalents per hour larger than the average gastric secretion of hydrochloric acid in normal subjects? State any assumptions needed in your procedure. (usea = .01.)
An educational psychologist is examining response times to an on-screen stimulus. The researcher believes there might be a weak effect from age, but expects a more pronounced effect for different color contrasts. She decides to examine a black on white (B/W) combination compared to 2 alternatives: red on white (R/W) and yellow on blue (Y/B). Here is the data for response times (in milliseconds): B/W R/W Y/B 16–17 202343207163119 19227203324343 92434142020829 18–19 4020371636483818 3118102312151422 2547383338253033 20–21 2617152026382223 2029292641192731 2830194245413845 Using MS Excel, conduct a 2-way ANOVA with α=0.05α=0.05. Fill in the summary table. The last column in the table below is read as, "Partial Eta-squared " and is a concept that was NOT covered in the lectures. Partial ηη 2 is used when there is a chance the data is not independent (click here to read more if interested) Computing the values for "Partial ηη 2" is not…
A researcher wishes to try three different techniques to lower the blood pressure of individuals diagnosed with high blood pressure. Fifteen subjects are randomly assigned to three groups: the first group takes medication, the second group exercises, and the third group follows a special diet. Each group is assigned five subjects. After four weeks, the reduction in each person’s blood pressure is recorded. The data collected are shown in the table. Test the claim that there is no difference among means at α=0.05. Medication Exercise Diet 6 10 7 14 10 6 15 9 5 14 5 8 13 6 6 1. What is the null and alternative hypothesis?2. In the decision rule: Reject H0 if Fc>F0.05,(A,B)=C .Otherwise, fail to reject H0. a. What is the value for df for treatments, A? b. What is the value for df for error, B? c. What is the critical value, C?
A campaign was designed to convince car owners that they should fill their tireswith nitrogen instead of air. At a cost of about $5 per tire, nitrogen supposedlyhas the advantage of leaking at a much slower rate than air, so that the idealtire pressure can be maintained more consistently. Before spending huge sumsto advertise nitrogen, it would be wise to conduct a survey to determine thepercentage of car owners who would pay for the nitrogen. How many randomly selected car owners should be surveyed? Assume that we want to be 95% confident that the sample percentage is within three percentage points of the true percentage of all car owners who would be willing to pay for the nitrogen.
A sports physiologist is investigating whether water or Gatorade provides the best hydration for athletes after training. A sample of 50 athletes between the ages of 18 and 30 was selected. On two consecutive days, each athlete ran 5 miles at a steady rate on a treadmill in a 75-degree room. On one of these days, 32 ounces of water was consumed after running. On the other day, 32 ounces of Gatorade was consumed after running. For each athlete, which beverage was consumed first was randomized. Hydration one hour after beverage consumption was measured, and results for the two beverages were compared. Which of the following is the best description of this study? (A) An experiment using a completely randomized design (B) An experiment using a matched-pairs design (C) An observational study using a simple random sample (D) An observational study using a cluster sample (E) An observational study using a stratified sample
Wild irises are beautiful flowers found throughout the United States, Canada, and northern Europe. This problem concerns the length of the sepal (leaf-like part covering the flower) of different species of wild iris. Data are based on information taken from an article by R. A. Fisher in Annals of Eugenics (Vol. 7, part 2, pp. 179 -188). Measurements of sepal length in centimeters from random samples of Iris setosa (I), Iris versicolor (II), and Iris virginica (III) are as follows below. I II III 5.7 5.1 6.5 4.7 6.2 5.1 4.7 6.6 4.7 5.8 4.9 7.5 4.6 5.2 5.3 5.3 6.2 6.2 5.4 5.8 6.4 (b) Find SSTOT, SSBET, and SSW and check that SSTOT = SSBET + SSW. (Use 3 decimal places.) SSTOT = SSBET = SSW = Find d.f.BET, d.f.W, MSBET, and MSW. (Use 4 decimal places for MSBET, and MSW.) dfBET = dfW = MSBET = MSW = Find the value of the sample F statistic. (Use 2 decimal places.)What are the degrees of freedom? (numerator) (denominator)
Wild irises are beautiful flowers found throughout the United States, Canada, and northern Europe. This problem concerns the length of the sepal (leaf-like part covering the flower) of different species of wild iris. Data are based on information taken from an article by R. A. Fisher in Annals of Eugenics (Vol. 7, part 2, pp. 179 -188). Measurements of sepal length in centimeters from random samples of Iris setosa (I), Iris versicolor (II), and Iris virginica (III) are as follows below. I II III 5.5 5.2 6.7 4.4 6.5 5.7 5.2 6.9 4.1 5.9 4.4 7.8 4.3 5.5 5.7 5.3 6.4 6.1 5.8 5.5 6.9 Shall we reject or not reject the claim that there are no differences among the population means of sepal length for the different species of iris? Use a 10% level of significance. (a) What is the level of significance? (b) Find SSTOT, SSBET, and SSW and check that SSTOT = SSBET + SSW. (Use 3 decimal places.) SSTOT = ? SSBET = ? SSW = ? Find d.f.BET, d.f.W, MSBET, and…
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of n = 9 college students is obtained and each student’s performance on a familiar video game is measured before and after eating a traditional Thanksgiving dinner including roast turkey. The average score dropped by M = 14 points after the meal with SS = 1152 for the difference scores. A. Is there is significant difference in performance before eating versus after eating? Use a two-tailed test with α = .05. SMD = ___________________________ tcritical = ________________________ tcalculated = ________________________ Decision = _______________________ B. Compute r2 to measure the size of the effect. r2 = _____________________________ C. Write a sentence demonstrating how the outcome of the test and the measure of effect size would…

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