For each of the following exercises, carry out the ten-step hypothesis testing procedure at the des-ignated level of significance. For each exercise, as appropriate, explain why you chose a one-sidedtest or a two-sided test. Discuss how you think researchers or clinicians might use the resultsof your hypothesis test. What clinical or research decisions or actions do you think would beappropriate in light of the results of your test?7.5.1 Jacquemyn et al. (A-18) conducted a survey among gynecologists-obstetricians in theFlanders region and obtained 295 responses. Of those responding, 90 indicated thatthey had performed at least one cesarean section on demand every year. Does thisstudy provide sufficient evidence for us to conclude that less than 35 percent of thegynecologists-obstetricians in the Flanders region perform at least one cesarean sectionon demand each year? Let a = = .05.

7.5.1 Given Information: Sample size n=295 Of which x=90 performed at least one cesarean section on…

Answered: 7.5.1 Jacquemyn et al. (A-18) conducted…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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For the T-test of the single sample, does the GPA of a group of students who were considered gifted in primary school is higher than the university's mean GPA? How do you state your hypothesis and then how do you decide based on the t-test if we should reject the null hypothesis?
Molly works for a meat producer, and she needs to determine whether containers of ground beef have the correct fat content. She obtains a random sample of 120 containers of ground beef and finds that 84 percent have the correct fat content. Molly then conducts a hypothesis test of H0:p=0.80H0:p=0.80 versus Ha:p≠0.80Ha:p≠0.80 and calculates a test statistic of 1.10 with a pp-value of 0.273. Which of the following best represents the meaning of the pp-value? If the population proportion is 0.84, the probability of observing a sample proportion of 0.80 is 0.273. A If the population proportion is 0.84, the probability of observing a sample proportion of at least 0.04 less than 0.84 is 0.273. B If the population proportion is 0.80, the probability of observing a sample proportion within 0.04 of 0.80 is 0.273. C If the population proportion is 0.80, the probability of observing a sample proportion at least 0.04 greater than 0.80 is 0.273. D If the…
The proportion of mango trees on an island that produce only dwarf fruit is p1. The proportion of mango trees on a different island that produce only dwarf fruit is p2. What is the null hypothesis for a test to determine if the proportions are different between the two islands? Select the correct answer below: H0: p1−p2≠0 H0: p1−p2=0 H0: p1−p2>0 H0: p1−p2<0
Given the situation below, create a problem and determine (a) the null and alternative hypotheses, (b) test statistic, (c) rejection region, and (d) applicability of the CLT.
The vice-president of administration wonders whether employees are taking adequate amounts of vacation time. Employee burnout is a concern. Research suggests that an employee taking less than 1.4 weeks of vacation annually is very likely to experience burnout. Analyze the employee vacation data and conduct a hypothesis test with the following results: t = 2.93p = 0.0084 What reasons should the vice-president provide to the president to justify the recommendation on employee burnout? Based on the data, is the presence of employee burnout an issue that may negatively impact the company?
For the following cases, you may use either the P-value approach or the rejection region approach to present a full hypothesis test, including: Identifying the claim and H0 and Ha, Finding the appropriate standardized test statistic, Finding the P-value or the rejection region, Deciding whether to reject or fail to reject the null hypothesis, and Interpreting the decision in the context of the original claim. A scientist claims that pneumonia causes weight loss in mice. The table below shows weight, in grams, of six mice before infection with pneumonia and two days after infection. At α = 0.01, evaluate the scientist’s claim. Before After Mouse 1 19.8 18.4 Mouse 2 20.2 19.6 Mouse 3 19.9 19.1 Mouse 4 22.1 20.7 Mouse 5 23.4 22.2 Mouse 6 23.6 23.0
Use the traditional method in testing the hypothesis in the problems below. In each problem, state the following:a. State the hypotheses and identify the claim.b. Find the critical value(s)c. Find the test value The manager of the cosmetics section of a large department store wants to determine whether newspaper advertising really does affect sales. For her experiment, she randomly selects 15 items currently in stock and proceeds to establish a baseline. The 15 items are priced at their usual competitive values, and the quantity of each item sold for a 1-week period is recorded. Then, without changing their price, she places a large ad in the newspaper, advertising the 15 items. Again, she records the quantity sold for a 1-week period. The results follow. Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15No. of Items Sold Before Ad 25 18 3 42 16 20 23 32 60 40 27 7 13 23 16No. of Items Sold After Ad 32 24 7 40 19 25 23 35 60 43 28 11 12 32 28
For which of the following cases would a t test be appropriate? A) Compare a hockey player’s scoring average against the entire NHL scoring average. B) Examine whether a company made more profit in 2018 or 2019. C) Test whether people who buy more kale show less health issues. D)Assess the difference in gas mileage for three different car manufacturers.
The director of student services at Oxnard College is interested in whether women are just as likely to attend orientation as men before they begin their coursework. A random sample of freshmen at Oxnard College were asked what their gender is and whether they attended orientation. The results of the survey are shown below: Data for Gender vs. Orientation Attendance Women Men Yes 334 367 No 266 370 What can be concluded at the αα = 0.10 level of significance? For this study, we should use Select an answer t-test for a population mean t-test for the difference between two dependent population means t-test for the difference between two independent population means z-test for a population proportion z-test for the difference between two population proportions The test statistic ? z = (please show your answer to 3 decimal places.) The p-value = t (Please show your answer to 4 decimal places.) Using a TI-84 cal
In the picture there is a given data and based from that data. There is no significant difference between the perceived level of riskiness of thrill behavior in males and in females. (Use a= 0.05) Identify the Null hypothesis and Alternative Hypothesis
A researcher expects that the number of people (18 years and older) who report binge drinking in the past month will be higher for Appleton WI residents as compared to the national rate, which is 25%. The researcher samples 100 residents from Appleton WI (age 18+) and finds that 36 of the 100 Appleton residents reported binge drinking in the past month. Using this data set answer the following questions: What is χ2obt? What is the df for this test? What is χ2CV? Based upon your answers to 1A and 1C, specify whether you would reject the null hypothesis or would fail to reject the null hypothesis. Then explain what could be concluded about binge drinking based upon this result. Report the result in APA format (you will need to use the correct symbols, spacing and italics).
For a certain year a study reports that the percentage of college students using credit cards was 83%. A college dean of student services feels that this is too high for her university, so she randomly selects 50 students and finds that 40 of them use credit cards. a- At a = 0.10, is she correct about her university? Calculate the value of the test statistic and state the alternatives, and conclusion. b- What would your conclusion be if the p-value of the test is equal to 0.0? c- Estimate the population proportion with 90% confidence.

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