The effectiveness of a new bug repellent is tested on 17 subjects for a 10 hour period. (Assume normally distributed population.) Based on thenumber and location of the bug bites, the percentage of surface area exposed protected from bites was calculated for each of the subjects. Theresults were as follows:x = 92, 8 = 12The new repellent is considered effective if it provides a percent repellency of at least 90. Using a = 0.01, construct a hypothesis test with nullhypothesis 90 and alternative hypothesis μ > 90 to determine whether the mean repellency of the new bug repellent is greater than 90 bycomputing the following:=(a) the degree of freedom(b) the critical t value(c) the test statistics

Answered: The effectiveness of a new bug…

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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b) Given P = W²H.If errors up to 2% and 1% are possible in the measured value of W and H respectively, then find the percentage error in the calculated value of P.
Please solve for G, H, and I
How often do you go out dancing? This question was asked by a professional survey group on behalf of the National Arts Survey. A random sample of n1 = 95 single men showed that r1 = 23 went out dancing occasionally. Another random sample of n2 = 92 single women showed that r2 = 19 went out dancing occasionally. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value a small amount and thereby produce a slightly more "conservative" answer. (a) Do these data indicate that the proportion of single men who go out dancing occasionally is higher than the proportion of single women who do so? Use a 5% level of significance. List the assumptions you made in solving this problem. Do you think these assumptions are realistic? What is the level of significance? What is the value of the sample test statistic? (Round your answer to three decimal places.) (b) Compute a 90% confidence…
QUA For Numbers 11 to 15: To determine the efficacy and lethal dosage of cardiac relaxants, anesthetized guinea pigs are infused with a drug (A, B, C, or D) until death occurs. Each drug was randomly assigned to ten guinea pigs, and the total dosage required for death of each guinea pig was recorded (smaller lethal doses are considered more effective). The software output of the analysis are given below: ANOVA Assumption Checks ANOVA - total_dosage Homogeneity of Variances Test (Levene's) Sum of Squares Mean Square df1 df2 df 36 0.307 drug 265 88.49 9.87 <001 1.25 3 Residuals 323 36 8.97 Normality Test (Shapiro-Wilk) Statistic 0.979 0.670 11. Which of the following is (are) TRUE about the design of the experiment? I. The experiment has an unbalanced design. II. The experiment was laid out in CRD without subsampling. A. I only B. Il only C. Both I and II D. Neither I nor II 12. At 5% level of significance, which of the following statement(s) is(are) TRUE about the test of assumptions of…
A psychologist would like to examine the effects of different testing methods on the final performance of college students. One group has regular quizzes, one group has three large exams, and the third group only has a final exam. At the end of the course, the psychologist interviews each student to get a measure of the student's overall knowledge of the material. Do these data indicate any significant differences among the three methods? Do the following computations: a. Compute and report the F Ratio at a a = .05 b. Compute and report the Tukey's HSD to determine exactly which methods are significantly different. Quizzes 4 6 3 7 T = 20 SS = 10 Exams 1 4 5 2 T = 12 SS= 10 Final Only 0 2 0 2 T=4 SS=4 G=36 EX² = 164 ✩
For items 1 to 6: It is beneficial to be able to estimate the weight of a tree based on measurements of the tree taken before its harvest. Measurements on two variables were taken from a random sample of trees, which were subsequently harvested, and the actual weight (in kg) of the products were determined. The variables measured are trunk diameter at breast height or DBH (measured about 4 feet from ground level; in inches), height of tree (in feet), and embryo type (monocot or dicot). 2. Assume that weight and diameter at breast height are bivariate normal. The use of the parametric correlation analysis on these two variables is valid because O A. the independent and dependent variables are identified O B. the variables are measured in ordinal level O C. the collected data are quantitative in nature O D. one variable will predict the other variable
All data entries are listed in Excel photo.
A teacher has found that his class performed particularly well on a quiz when the material was related to pop culture (M= 77) compared with normal quiz performance (u= 69, 0 =20 ). What is the effect size for this effect? Select one: • a. 0.40 e b. 1.57 • c. 0.94 • d. -0.94 e e. All of the above
(Please show all work on how you got this so I may learn from it and check my answers.) A researcher is interested in understanding if perfume affects how attractive a person is perceived tobe. To examine this phenomenon, the research randomly assigns the participants to rate theattractiveness of an individual from one of three groups: no perfume, a small amount of perfume, and alarge amount of perfume. Below are the ratings to how attractive the participants find the individual:NO Perfume A SMALL Amount of Perfume A LARGE Amount of Perfume4 6 05 3 13 5 05 4 14 5 23…
For items 1 to 6: It is beneficial to be able to estimate the weight of a tree based on measurements of the tree taken before its harvest. Measurements on two variables were taken from a random sample of trees, which were subsequently harvested, and the actual weight (in kg) of the products were determined. The variables measured are trunk diameter at breast height or DBH (measured about 4 feet from ground level; in inches), height of tree (in feet), and embryo type (monocot or dicot). Suppose that the assumptions of linear regression were satisfied. A multiple linear regression model for predicting the weight of tree using diameter at breast height, height of tree, and embryo type was fitted. The software output is summarized below. Use alpha=5%. Intercept DBH height Estimate -1015.442 0.983 164.008 9.183 type_monocot -161.278 Multiple R-squared Std. Error 141.622 39.626 5.486 88.177 Adjusted R-squared 0.9703 tc -7.170 4.139 1.674 -1.829 p-value 0.0005383 0.0020 0.0144 0.1695 0.1414…
(6 to 9) The level of cretaine phosphokinase (CPK) in blood samples measures the amount of muscle damage for athletes. At Jock State University, the level of CPK was determined for each of 25 football players and 15 soccer players before and after practice. The two groups of athletes are trained independently. The data summary is as follows : For football players: n=25 Before Practice After Practice Difference (Before-After) Mean 254.73 225.6 29.13 Standard deviation 115.5 132.6 21.00 For soccer players: n=15 Before Practice After Practice Difference (Before-After) Mean 177.1 173.8 3.3 Standard deviation 60.7 64.4 6.88 Assume that all the data above are normal, use the information above to answer problem (7) Construct a 95% Confidence Interval for the difference in mean CPK values for football players BEFORE and AFTER exercises.
A sample of students is to be selected to estimate the proportion who have recieved a medical examination during the past year. The survey found that x =567 students were examined during the past year. Construct a 95% interval estimate of the population proportion if the sample size was n=700

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