The following table shows the results of a study on smoking and three illnesses. We are interested in determiningif the proportions smokers in the three categories are different from each other.EmphysemaHeart problemCancerTotalSmoker15070100320Non-smoker50130500680Total2002006001000The degrees of freedom for the test are(A) 2+3-2=3(B) 3-1-2 (C) 2×3-1-5 (D) 2+3-1=4

Given that Number of row= r = 2 Number of Column=c=3

Answered: The following table shows the results…

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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There is a lot of interest in the relationship between studying music and studying math. We will look at some sample data that investigates this relationship. Here are the Math SAT scores from 8 students who studied music through high school and 12 students who did not. The degrees of freedom (d.f.) is given to save calculation time if you are not using software. Math SAT Scores Music (1) 576 548 618 568 629 641 538 567 No Music ( 545 489 566 527 531 542 570 516 499 498 518 508 x2) degrees of freedom: d.f. = 11 (b) Find the critical value. mean $² S 585.625 1489.98214285714 38.6002868235087 525.75 686.204545454545 26.195506207259 Test the claim that students who study music in high school have a higher average Math SAT score than those who do not. Use a 0.01 significance level. (a) Find the test statistic.
In a survey, 100 people were asked if they smoke and whether or not they exercise regularly (more than twice a week). The results are summarized in the table below. Smoke Do not smoke Exercise regularly 4 21 Do not exercise regularly 17 58 (a) What percentage of the people do not smoke? (b) What percentage of the people do not exercise regularly? (a) % X ? (b) %
A biology professor claims that, on the average, 15% of her students get a grade of A, 30% get a B, and 30% get a C, 10% get a D, and 15% get an F. The grades of a random sample of 117 students were recorded. The following table presents the results. Grade 1- 12 Grade 2- 51 Grade 3- 23 Grade 4- 28 Grade 5- 3 What is the value of x2 (x squared) 11.143 9.488 49.038 47.900
The number of mistakes made on a typing test is Normally distributed. Five office employees---Kelly, Meredith, Stanley, Oscar, and Toby---each take this typing test and record the number of mistakes they make. In the table below, the corresponding zz-score is given for each individual. Based on this information, which worker made the least mistakes on the typed test and therefore performed best? z scores kelly 2.2 mary -0.4 stanley -1.8 oscar 1.0 toby 0
Favorite Skittles Flavor Skittles are a popular fruity candy with five different flavors (colored green, orange, purple, red, and yellow). A sample of 65 people recorded their favorite flavor and the results are shown in the table below. Perform a chi-square test, as indicated in the steps below, to see whether or not the flavors are equally popular. Green Orange Purple Red Yellow 17 9 15 13 11 Table 1 Skittles popularity
Hi How do you do (b)
ONLY need D, C
A group of cars were built such that µ = 46 mpg and o = 12 mpg. 95% of the cars will be less than what mpg? 95% of the cars will be greater than what mpg? 99% of the cars will be greater than what mpg? Interpolate to get third digit.
Walgreens purchased several new processing machines. The production department needed some guidance with respect to qualification needed by an operator. Is age a factor? Is the lenght of service as an operator (in years) important? In order to explore further, the factors needed to estimate performance on the new processing machines, 4 variables were listed; X1 - Length of time an employee was in the industry X2 - Mechanical aptitude test score X3 - Prior on the job rating X4 - Age Performance on the new machine is designated as y 30 employees were selected at random. Data were collected for each, and their performances on the new machines were recorded. A few results are; Name Performance on new machine (y) Length of time in industry (X1) Mechanical aptitude score (X2) Prior on the job performance (X3) Age (X4) Bill 112 6 310 115 49 Brenda 120 3 320 117 28 The equation is attached; As age increases by one year, how much does estimated performance on the new…
Favorite Skittles Flavor Skittles are a popular fruity candy with five different flavors (colored green, orange, purple, red, and yellow). A sample of 65 people recorded their favorite flavor and the results are shown in the table below. Perform a chi-square test, as indicated in the steps below, to see whether or not the flavors are equally popular. Green Orange Purple Red Yellow 17 9 15 13 11 Table 1 Skittles popularity
Basketball players can take shots worth 333 points, 222 points, or 111 point. A scout is assessing two players—Tabitha and Lauren—who play for different teams in different leagues. The scout wonders if they have similar or different shot selections. They take a random sample of Tabitha's games and a separate random sample of Lauren's games. They tally how many of each type of shot the players attempted in those games. Here is a summary and the results of a chi-square test: Chi-square test: Shot vs. player Tabitha Lauren 333-point 888 121212 Expected 10.3410.3410, point, 34 9.669.669, point, 66 222-point 404040 373737 Expected 39.8339.8339, point, 83 37.1737.1737, point, 17 111-point 121212 777 Expected 9.839.839, point, 83 9.179.179, point, 17 �2=2.097, DF=2, P-value=0.350χ2=2.097, DF=2, P-value=0.350\chi, squared, equals, 2, point, 097, comma, start text, space, D, F, end text, equals, 2, comma, start text, space, P, negative, v, a, l, u, e, end text,…

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