2. The assumption that participant number 3 in the study below never developed the event of interestwould likely lead to which of the following statistical errors?23235Number of Months Until the EventA) Right censoringB) Left censoringC) Noninformative censoringD) Statistical censoringParticipants6.

Given the bar chart of participants in X axis and number of months until the event in Y axis.

Answered: 2. The assumption that participant…

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 set of data was published in the fall 2019 Phi Kappa Phi Forum regarding the performance of Major League Baseball (MLB) umpires in calling balls and strikes. The article is based on data collected by MLB over eleven seasons (2008-2018). This study shows that it is common for umpires to make incorrect calls more than 20% of the time. An average game has about 300 pitches where the umpire has to make a decision. Assume that we take a random sample of 300 of the 4 million ball/strike calls in the database. Our analysis of a new sample yielded a Z test statistic of 2.17 for this one-sided test to the right. The p-value is = .015. Make a decision on this hypothesis test using a 5% level of significance and state the reason for your decision. O Reject the null hypothesis since the p-value is .01
2) A company was examining the perception of sports fans in a specific region and outside of that region to see if people viewed a specific team favorable or unfavorable. It was previously determined that given a person was from the region the probability they considered the team favorable was 0.7, and given that the person was not from the region, the probability they considered the team unfavorable was 0.28. Consider a collection of 35 people were surveyed, where 28 were from the region, and 7 people were from outside the region. a) Given that a randomly selected response from the sample was favorable, what is the probability they were from the region? b) Given that a randomly selected response from the sample was not favorable, what is the probability they were from the region?
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1. True or False a. p-values are used to determine statistical significance. b. If two events are positively correlated, then one of them must have caused the other. c. If two variables are negatively correlated, then one of them tends to decrease as the other increases.
1. The American Journal of Public Health (July 1995) published a study of the relationshipbetween passive smoking and nasal allergies in Japanese female students. The study revealedthat 80% of students from heavy-smoking families showed sign of nasal allergies on physicalexaminations. Consider a sample of 25 Japanese female students exposed daily to heavysmoking. d. What is the probability that more than 15 of the students will NOT have nasal allergies?e. What is the probability that more than 15 but fewer than 20 will have nasal allergies?
5 PART E Can we conclude that the median monthly rent for the apartments on the east side is less than what is stated on the website? YES OR NO
10. The National Institute of Mental Health published an article stating that in any one-year period, approximately 9.5 percent of American adults suffer from depression or a depressive illness. Suppose that in a survey of 100 people in a certain town, seven of them suffered from depression or a depressive illness. If you were conducting a hypothesis test to determine if the true proportion of people in that town suffering from depression or a depressive illness is lower than the percent in the general adult American population, what would the null and alternative hypotheses be? a. Ho: b. Ha
12. An investigator reviewed the medical records of 200 children seen for care at Boston Medical Center in the past year who were between the ages 8-12 and identitied 40 with asthma He also identified 40 children of the same ages who were free of asthma Each child and their family were interviewed to assess whether there might be an association between certain environmental factors such as exposure to second hand smoke. This study is an example of a: a. randomized controlled trial b. case-control study c. cohort study d. crossover trial
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1. An insurance company classifies its policyholders into three categories: low risk, medium risk and high risk. The chance that a policyholder classified as low risk, medim risk, and high risk will be involved in an accident within the following year is 0.05, 0.10 and 0.20, respectively. If 50% of the policies are low risk, 35% are medium risk and 15% are high risk, what is the chance that a random policyholder will experience an accident within the year? At the end of the year, what is the probability that a policyholder is classified high risk given that he or she experienced an accident within that year?

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