2. We would like to investigate the incidence of concussions among athletes. Samples of soccer players,non-soccer athletes, and non-athletes are collected.0# of Concussions12≥ 3255111083835050Soccer45N-S Athletes6815Non-athletes45To see whether these three types of individuals have the same distribution, conduct a chi-square testof homogeneity at a = 5%. State (i) the degree of freedom, (ii) the expected frequency count of eachcell and (iii) the conclusion of the test.

degree of freedom =( number of row -1 )* ( no. of column -1 ) = 2*3=6and the value of test statistic…

Answered: 2. We would like to investigate 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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24.* Doughnuts and Fat. A classic study, conducted in 1935 by B. Lowe at the lowa Agriculture Experiment Station, analysed differences in the amount of fat absorbed by doughnuts in cooking with four different fats (10, 30,60, 90%)For the experiment, 24 batches of doughnuts were randomly divided into four groups of 6 batches each. The four groups were then randomly assigned to the four fats. Identify the a. experimental units. b. response variable. c. factors. d. levels of each factor. e. Treatments f. Sample size f. Type of variable g. Type of measurement
10. Claim: P₁ = P₂; α = 0.05. Sample statistics: x1 = 265, n₁ - X2 204, 2 - 301, 247 'D
3. It has been claimed that over 30 percent of entering college students have blood cholesterol levels of at least 200. Randomly select 20 students in the list in Table 1 to test this hypothesis. What conclusion do the 5 percent level of significance?
1. A purification process for a chemical involves passing it, in solution, through a resin on which impurities are adsorbed. A chemical engineer wishing to test the efficiency of 3 different resins took a chemical solution and broke it into 15 batches. She tested each resin 5 times and then measured the concentration of impurities after passing through the resins. The results of the Analysis of Variance on the data are shown below. Analysis of Variance Table Response: concentration Df Sum Sq Mean Sq F value Pr(>F) resin 2 1.45E-05 7.27E-06 0.048737 0.9526 Residuals 12 0.001789 0.000149 a.) Interpret the result of the Analysis of Variance (ANOVA). What is the statistical decision and corresponding conclusion? b.) What is the implication of the results obtained from the analysis of the data?
VI. ASSESSMENT/ACTIVITY Compute the z-value and state whether the z-score locates the raw score x within a sample or within a population 1. x = 50 S = 5 X = 40 2. x = 40 o = 8 u = 52 3. x = 36 S = 6 x = 18 4. x = 74 5. x = 82 S = 10 X = 60 o = 15 u = 75
3. Can SAT scores predict college performance? Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation. A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58 The scatter diagram for the SAT score and GPA is given below: (a) Find the sample correlation coefficient r. Truncate to two decimal places. What does the value tell you about the data? (b) Find the equation of the least squares line . Truncate to four decimal places. What does the slope mean? (c) Find the value of the coefficient of determination . Truncate to two decimal places. What does this number mean? (d) What is the predicted GPA if a computer science major got a…
6
35. Statistics students in Oxnard College sampled 10 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The bivariate data are shown below: Number of Pages (xx) Cost(yy) 757 134.55 538 106.7 782 142.3 461 83.15 597 116.55 372 74.8 328 75.2 480 92 978 154.7 261 58.15 A student calculates a linear modely = x + . (Please show your answers to two decimal places)Use the model to estimate the cost when number of pages is 849.Cost =$ (Please show your answer to 2 decimal places.)
15)
2. We would like to investigate the incidence of concussions among athletes. Samples of soccer players, non-soccer athletes, and non-athletes are collected. # of Concussions 0 1 2 ≥ 3 Soccer 45 25 11 10 N-S Athletes 68 15 8 5 Non-athletes 45 5 3 0 To see whether these three types of individuals have the same distribution, conduct a chi-square test of homogeneity at a = 5%. State (i) the degree of freedom, (ii) the expected frequency count of each cell and (iii) the conclusion of the test.

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