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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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A professor wants to evaluate whether testing students weekly with a quiz improves their learning of the class material. The professor teaches the same course in two different semesters, with a class size of 30 in both. In the first semester, the students completed a quiz each week. In the second semester, the students were not given any quizzes. Assume that the teaching was otherwise identical in each semester. The course percentage grade for each student is given in the sheet titled Test Scores. a. Analyze whether the class that was given the weekly quizzes scored higher on aver- age in the class. Give a 95% confidence interval as well as an appropriate test result. Be sure to comment on the validity of each of the two methods for this data. b. Analyze whether students were more likely to pass in the class that was given the weekly quizzes. Give a 95% confidence interval as well as an appropriate test result. Be sure to comment on the validity of each of the two methods for this…
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.In a marketing survey, a random sample of 980 supermarket shoppers revealed that 264 always stock up on an item when they find that item at a real bargain price. (a) Let p represent the proportion of all supermarket shoppers who always stock up on an item when they find a real bargain. Find a point estimate for p. (Enter a number. Round your answer to four decimal places.) (b) Find a 95% confidence interval for p. (For each answer, enter a number. Round your answers to three decimal places.)lower limit upper limit Give a brief explanation of the meaning of the interval. 95% of all confidence intervals would include the true proportion of shoppers who stock up on bargains.5% of all confidence intervals would include the true proportion of shoppers who stock up on bargains. 95% of the confidence intervals created using this method would include the…
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.In a marketing survey, a random sample of 990 supermarket shoppers revealed that 260 always stock up on an item when they find that item at a real bargain price. (a) Let p represent the proportion of all supermarket shoppers who always stock up on an item when they find a real bargain. Find a point estimate for p. (Enter a number. Round your answer to four decimal places.)________________ (b) Find a 95% confidence interval for p. (For each answer, enter a number. Round your answers to three decimal places.)lower limit _____________ upper limit _____________
2. A customer at a specialty milk tea shop observed the amount of time, in minutes, that each of 20 customers spent waiting to receive an order. The results are recorded in the table below: Time (min) to receive order 3.2 4.0 3.8 2.4 4.7 5.1 4.6 3.5 3.5 6.2 3.5 4.9 4.5 5.0 2.8 3.5 2.2 3.9 5.3 Find the mean and sample standard deviation of these data. Interpret the results. 62 29 2.9
For each of the following, indicate the scale of measurement that best describes the infor mation.a. In 2008, Dell Corporation had approximately 78,000 employees.b. USA Today reports that the previous day’s highest temperature in the United States was 105 degrees in Death Valley, California. Source: USA Today, June 19, 2009, p. 12A.c. An individual respondent answers “yes” when asked if TV contributes to violence in the United States.d. In a comparison test of family sedans, a magazine rates the Toyota Camry higher than the VW Passat.
5. Using 3-point formulas, complete the following table with estimates for and ". 1.0 1.1 1.2 6.0 6.4 7.2 8.0 1.3
Identify the following values. Consider the function shown with a graphical depiction of limƒ ( x = L , including the roles XC of & and d. 201 1.8- 1.6 1.4- 1.2- Y 1.0- 0.8- 0.6- 0.4 0.2- 0.0+T 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 1. 1.6 2. 1.0 E = 3. 0.4 = %3D 4. 0.6 >
7. CD is an altitude drawn to the hypotenuse of AABC. What is the value of AC, rounded to the nearest hundredth, if AD = 4 and BD = C 9? %3D A B.
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.In a survey of 1000 large corporations, 246 said that, given a choice between a job candidate who smokes and an equally qualified nonsmoker, the nonsmoker would get the job. (a) Let p represent the proportion of all corporations preferring a nonsmoking candidate. Find a point estimate for p. (Round your answer to four decimal places.)(b) Find a 0.95 confidence interval for p. (Round your answers to three decimal places.) lower limit upper limit What is the margin of error based on a 95% confidence interval? (Round your answer to three decimal places.)
2
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What is the correct alternative hypothesis for the following conjecture – the average price of a 1/2 ton truck is below $39,800