A contingency analysis table has been constructed from data obtained in a survey of high school students in which respondents were asked to indicate whether they had ever smoked cigarettesor if they had ever smoked marijuana. Use the contingency table shown to the right to answer parts a and b.a. Use the chi-square approach to test whether smoking a cigarette is independent of smoking marijuana. Test using an x = 0.05 level.Determine the null hypothesis (Ho) and the alternative hypothesis (HA). Choose the correct answer below.O A. Ho: Cigarette use and marijuana use are not independent.HA: Cigarette use and marijuana use are independent.OB. Ho: Cigarette use and marijuana use have non-equal proportions.HA: Cigarette use and marijuana use have equal proportions.OC. Ho: Cigarette use and marijuana use have equal proportions.HA: Cigarette use and marijuana use have non-equal proportions.O D. Ho: Cigarette use and marijuana use are independent.HA: Cigarette use and marijuana use are not independent.Calculate the chi-square test statistic.x² = (Round to two decimal places as needed.)Determine the critical value for α = 0.05.The chi-square critical value is(Round to four decimal places as needed.)Determine a conclusion. Choose the correct answer below.O A. Do not reject Ho. There is sufficient evidence to conclude that the two variables are not independent.O B. Do not reject Ho. There is insufficient evidence to conclude that the two variables are not independent.O C. Reject Ho. There is insufficient evidence to conclude that the two variables are not independent.O D. Reject Ho. There is sufficient evidence to conclude that the two variables are not independent.b. Calculate the p-value for this hypothesis test.p-value =(Round to four decimal places as needed.)CigarettesYesNoYes91446MarijuanaNo5747370

From given data we have : Yes NO Yes 914 574 NO 46…

Answered: A contingency analysis table has been…

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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Researchers wanted to know the effectiveness of a new allergy medicine. A study was conducted on 500 adults who experience allergy symptoms. Each adult was randomly assigned to receive the new allergy medicine or a placebo. Researchers recorded whether or not their symptoms improved within 1 week. a. Complete the two-way table summarizing the findings. Allergy Medicine Placebo Total Symptoms Improved 85 80 Symptoms DidNot Improve Total 215 285 500 b. Use the study results to complete the following. Round your answer to the nearest tenth of a percent, as needed. Notice the percent sign is already included, so you just need to type the number. What percent of the adults in this study were given the new allergy medicine? % What percent of those who experienced improvements received the allergy medicine? % What percent of those who received the allergy medicine experienced improvements? % What percent of those who did not received the allergy…
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durty2
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In a researcher’s action research, she seeks to investigate whether a particular intervention works for teaching a mathematical concept. She organizes a diagnostic test (pre-test), taught with her intervention and then did a post-test. The recorded scores for ten students is in the table below: Student ID 01 02 03 04 05 06 07 08 09 10 Pre-test 66 49 63 70 71 65 75 88 87 51 Post-test 69 50 61 72 78 66 75 89 86 54 I. Draw a scatter plot for the observed scores and superimposed in it a least square regression line. ii. Compute the pearson product moment coleration for the two test and interpret your results.
B7
complaint and, if so, whether the complaint was medical or nonmedical in nature. After a year, a tally from these patients was collected to count number who left the HMO voluntarily. Here are the data on the total number in each group and the number who voluntarily left the HMO: No complaint Medical complaint Nonmedical complaint Total A certain health maintenance organization (HMO) wishes to study why patients leave the HMO. A SRS of 423 patients was taken. Data was collected on whether a patient had filed a 177 111 135 Left 64 27 50 If the null hypothesis is Ho : pı = P2 = P3 and using a = 0.05, then do the following: (a) Find the expected number of people with no complaint who leave the HMO: (b) Find the expected number of people with a medical complaint who leave the HMO: (c) Find the expected number of people with a nonmedical complaint who leave the HMO: (d) Find the test statistic: (e) Find the degrees of freedom: (f) Find the critical value: (g) The final conclusion is OA. We…
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