The probability that an individual randomly selected from a particular population has a certain disease is 0.06. A diagnostic test correctly detects the presence of the disease 93% of the time andcorrectly detects the absence of the disease 98% of the time. If the test is applied twice, the two test results are independent, and both are positive, what is the (posterior) probability that theselected individual has the disease? [Hint: Tree diagram with first-generation branches corresponding to Disease and No Disease, and second- and third-generation branches corresponding toresults of the two tests.]

Given probability that an individual randomly selected from a particular population has a certain…

Answered: correctly detects the absence of 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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An educational psychologist studies the effect of frequent testing on retention of class material. In one of the professor's sections, students are given quizzes each week. The second section receives only two tests during the semester. At the end of the semester, both sections receive the same final exam, and the scores are summarized below. Do the data indicate that testing frequency has a significant effect on performance? Use a two-tailed test with α = .01. Include the null hypothesis in symbols, critical region(s), and a conclusion about significance. Compute r2 and state the size of the effect (e.g. small, medium, large). Frequent Quizzes Two Exams n = 15 n = 15 M = 72 SS= 112 M = 68 SS= 98
A. P (win/regular) = 0.82 P (win/prevent) = 0.64 Conclusion: You are more likely to win by playing prevent defense. B. P (win/regular) = 0.33 P (win/prevent) = 0.67 Conclusion: You are more likely to win by playing prevent defense. C. P (win/regular) = 0.82 P (win/prevent) = 0.64 Conclusion: You are more likely to win by playing regular defense. D. P (win/regular) = 0.33 P (win/prevent) = 0.67 Conclusion: You are more likely to win by playing regular defense.
right handedness is an individual’s preference to use the right hand as the dominant hand to perform various tasks. A random sample of 500 people were survey whether they are right handed. The researcher performed a hypothesis test to test the claim that the proportion of right handed people are more than 0.1. The population proportion of right-handed people is 0.10. The researcher concluded that there is enough evidence that the proportion of right handed people are more than 0.1. Identify whether the researcher's decision is a Type I error, Type II error, or correct decision.
Will improving customer service result in higher stock prices for the companies providing the better services? "when a company's satisfaction score has improved over the prior years results and is above the national average (currently 75.7), studies show its shares have a good chance of outperforming the broad stock market in the long run." The following satisfaction scores of three companies for the 4th quarters of two previous years were obtained from the American Customer satisfaction index. Assume that the scores are based on a poll of 55 customers from each company. Because the polling has been done for several years, the standard deviation can be assumed to equal 7 points in each case. Company year 1 score year 2 score Rite Aid 72 75 Expedia 78 79 J.C Penney 75 77 a. For Rite Aid is the increase in the satisfaction score from year 1 to year 2 statistically significant? use ax=.05 and null…
I need help with #3 please.
Will improving customer service result in higher stock prices for the companies providing the better service? "When a company's satisfaction score has improved over the prior year's results and is above the national average (currently ), studies show its shares have a good chance of outperforming the broad stock market in the long run." The following satisfaction scores of three companies for the 4th quarters of two previous years were obtained from the American Customer Satisfaction Index. Assume that the scores are based on a poll of customers from each company. Because the polling has been done for several years, the standard deviation can be assumed to equal points in each case. Company Year 1 Score Year 2 Score Rite Aid 74 75 Expedia 76 78 J.C. Penney 77 81
Test the claim that the proportion of men who own cats is larger than 20% at the .05 significance level. The null and alternative hypothesis would be: 0.2 Но:р — 0.2 Но: и 0.2 Ho:H Ho:H H:р + 0.2 Н]:р 0.2 Hi:р > 0.2 Hi:р#0.2 0.2 Но:р || The test is: left-tailed two-tailed right-tailed Based on a sample of 25 people, 25% owned cats The test statistic is: (to 2 decimals) The critical value is: (to 2 decimals) Based on this we: O Fail to reject the null hypothesis O Reject the null hypothesis
The management of Choices Inc. can pay bonuses for customer service staff based on feedback scores or based on reversed cancellations. Good feedback and reversed cancellations both generate $12,000 in additional profit for the company. A hard-working employee has a 75% chance of getting a positive score, but only a 50% chance of reversing a cancellation, If the employee fails to put in full effort, then the likelihood of a positive score or a reversed cancellation is, in both cases, 25%. Assume an employee's utility function for income w is u(w) = sart(w), and the effort cost from working hard (in utility units) is 10. With a base wage of 10,000, how much more profitable is Choices Inc. with bonuses based on feedback, instead of reversed cancellations? (1.e. what is the difference in profit if the manager always offers the smallest bonus that will induce the employee to work hard?) O $3,000 O $4,500 O $9,000 $12,000
Will improving customer service result in higher stock prices for the companies providing the better service? "When a company's satisfaction score has improved over the prior year's results and is above the national average (currently 75.7), studies show its shares have a good chance of outperforming the broad stock market in the long run." The following satisfaction scores of three companies for the 4th quarters of two previous years were obtained from the American Customer Satisfaction Index. Assume that the scores are based on a poll of 67 customers from each company. Because the polling has been done for several years, the standard deviation can be assumed to equal 6 points in each case. Company Year 1 Score Year 2 Score Rite Aid 73 75 Expedia 72 75 J.C. Penney 73 74 a. For Rite Aid, is the increase in the satisfaction score from year 1 to year 2 statistically significant? Use a = .05 and null hypothesis is Ho : H1 – 42 <0. What can you conclude? z value (to 2 decimals) p-value (to…
pls answer no.3 on paper
You have a sample of 500 individuals arranged in a 2 x 2 table. Of these, 220 have hypertension and 250 have Covid. there is overlap between covid and hypertension, but this is not given. which is best match for your expected values? 120,130,120.130 115, 135,110,140 110, 140, 110, 140 110,140,120,130

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