(7) We are interested in whether the mean blood pressure for women is equal to the mean bloodpressure for men or whether these two means are different. The null hypothesis is that these twomeans are equal. If they are different we have no prior view as to whether women or men havethe higher mean blood pressure. We took a sample of the blood pressures of 16 women (group 1)and found an average blood pressure x1 of 119.4. We also measured the blood pressures of theirrespective brothers (group 2) and found an average blood pressure x 2 of 121.2. In order to carryout the relevant t test we calculated s?a to be 25. We choose a Type I error value a = 0.05.Calculate the numerical value of whichever test statistic you prefer (there are two possibilities).Givenyourchoice of test statistic, state the relevant critical point(s).Carry out the test, indicating whether you accept or reject the null hypothesis.

Answered: Image /qna-images/answer/8d0821c4-4bcf-4f45-8fbf-38510bfb2059.jpg

Answered: (7) We are interested in whether 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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A production engineer wants to determine if two assembly lines are producing the same mean number of units daily. To test this: a sample of 10 days on line A reveals a mean of 110 units with a variance of 200 a sample of 15 days on line B reveals a mean of 100 units with a variance of 150. Set up hypotheses and perform the appropriate test to resolve this question. Fully interpret your results.
As a result of dog breeding for certain physical traits, many dog breeds have changed in the last 100 years. A dog breeder wants to measure the effects of breeding on the face length of the boxer breed using a hypothesis test. Suppose that the dog breeder has face length measurements (in inches) from a random sample of 40 female boxer dogs taken in 1915 and a random sample of 40 female boxer dogs taken in 2015. Which type of hypothesis test should the breeder use? Reference: Elegans, C. 100 Years of Breed Improvement. 2012. Dog Behavior Science. Retrieved from: https://dogbehaviorscience.wordpress.com/2012/09/29/100-years-of-breed-improvement Test for one population proportion Test for one population mean Test for a difference in two population proportions Test for a difference in two population means
A production engineer wants to determine if two assembly lines are producing the same mean number of units To test this: a sample of 10 days on line A reveals a mean of 110 units with a variance of 200 a sample of 15 days on line B reveals a mean of 100 units with a variance of 150. 1. Set up hypotheses and perform the appropriate test to resolve this question. Fully interpret your results.
A new drug for pain relief is being tested within a given palliative care population. The new drug is being compared to an already approved pain relief drug that is commonly used in providing palliative care to patients who experience chronic severe pain. Assume the patients are asked to rate the pain on a scale from 1 to 10, and the data presented below was obtained from a small study designed to compare the effectiveness of the two drugs. Set up and interpret the results of a Mann-Whitney U test with an alpha of .05. Pain Rating as Reported by Patients Old Drug 1 3 3 4 6 New Drug 1 2 3 3 7 A) We fail to reject H0, which states the two populations are equal at the alpha equals .05 level because the calculated Uvalue of 10.5 is greater than the critical U value of 2. B) We fail to reject H0, which states the two populations are equal at the alpha equals .05 level…
Oishi & Shigehiro (2010) report that people who move from home to home frequently as children tend to have lower than average levels of well-being as adults. To further examine this relationship, a psychologist obtains a sample of n = 12 young adults who each experienced 5 or more different homes before they were 16 years old. These participants were given a standardized well-being questionnaire for which the general population has an average score of µ = 40. The well-being scores for this sample are as follows: 23, 37, 41, 35, 43, 37, 33, 34, 36, 38, 31, 38. On the basis of this sample, is well-being for frequent movers significantly different from the well-being of the general population? Test with alpha a = .05. Is this a one- %3D tailed or two-tailed test?
According to the most recent General Social Survey, 70% of adults watch TV nightly. A researcher believes that the proportion of college students who watch TV nightly is less than this. To test this claim the research samples 400 college students and finds that 276 watch TV nightly. At the 0.05 level of significance does this data provide evidence to suggest that the proportion of college students who watch TV nightly is less than 70%? Select the correct hypothesis test for this problem:
If a treatment is expected to decrease scores on a variable for which the mean is expected to be µ = 50, what is the null hypothesis?
A researcher hypothesizes that the regions in the US feel differently about Hip Hop Music. To test this claim, she took a random sample of 15 people (n = 15, N = 75) from each of 5 US regions (G = 5), and she asked each person in that sample to rate (from 1 to 16) how much they liked Hop Hop. The following ANOVA table has some of her results. Please help her answer her research questions by completing the following ANOVA table below and answering the follow-up questions. Be sure to label your answers with the appropriate letter. Source Sums of Squares DF Mean Square F Effect (between) a) b) e) g) Error (within) 100.71 c) f) - Total 156.25 d) - - h) Based on the observed F-statistic (α = 0.05) and a critical F = 2.47, should she retain or reject the null hypothesis? i) In everyday language, what can she conclude about the research question? j) Suppose that the average love of Hip Hop in the West was 11.56 and the average love in the…
The director of research and development is testing a new drug. She wants to know if there is evidence at the 0.02 level that the drug stays in the system for more than 335 minutes. For a sample of 51 patients, the mean time the drug stayed in the system was 338 minutes. Assume the population variance is known to be 361 a-State the null and alternative hypotheses. b-Find the value of the test statistic. Round your answer to two decimal places. c-Specify if the test is one-tailed or two-tailed d-Find the P-value of the test statistic. Round your answer to four decimal places. e-Identify the level of significance for the hypothesis test. f-Make the decision to reject or fail to reject the null hypothesis.
A psychology graduate student wants to test the claim that there is a significant difference between the IQs of spouses. To test this claim, she measures the IQs of 9 married couples using a standard IQ test. The results of the IQ tests are listed in the following table. Using a 0.10 level of significance, test the claim that there is a significant difference between the IQs assuming that the population distribution of the paired differences is approximately normal. Let the spouse 1 group be Population 1 and let the spouse 2 group be Population 2. IQs of Married Couples Spouse 1 122 104 123 113 110 103 112 111 105 Spouse 2 120 108 126 114 112 105 117 110 110 State the null and alternative hypotheses for the test. Compute the value of the test statistic. Round your answer to three decimal places. Draw a conclusion and interpret the decision.
You have been asked to determine if two midterm tests of the same class have different mean scores. Midterm test 1 has mean μ1 and midterm test 2 has mean μ2. Using a random sample of 25 students, the sample mean is 50 for midterm test 1 and 60 for midterm test 2. Test statistics is given and it equals to -2.5. At the 5% significance level, you would like to test whether the students have the same performance in the two midterm tests. What is the conclusion for this test? (4%) A. Reject the null hypothesis. B. Both the null hypothesis and alternative hypothesis are false. C. Reject the alternative hypothesis. D. Cannot reject the null hypothesis. 2. From a random sample of 300 students at a state university, you find the average number of hours of study time each week is 30 with a standard deviation of 5. In this research situation, (4%) A. the parameter is 5. B. the parameter is 30. C. the population is the 300 students surveyed.…
A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 52 men and 73 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. (a) State the null and alternative hypotheses. Which of the following is correct? OC. Hgi H1 =H2i H H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.02. What is the P-value? P.value =

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