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- 2.2.25 According to a Pew Research Center report from 2012, the average commute time to work in California is 27.5 minutes. To investigate whether a different average is true for the small city that she lives in, a California high school student surveys 45 people she knows-her teachers, her parents and their friends and co-workers-and finds the average commute time for this sample to be 24.33 minutes, with a standard deviation of 9.53 minutes.A survey indicates that you should always try to negotiate for a better deal when shopping or paying for services. In fact, based on this survey, 30% of the people under the age of 34 were more likely to "haggle," compared to only 10% of those aged 65 and older. Suppose that this survey included 90 people under the age of 34 and 60 people who are 65 or older. (a) What are the values of Punder 34 and P65 or older for the two groups in this survey? under 34 P65 or over USE SALT = (b) Find a 95% confidence interval for the difference in the proportion of people who are more likely to "haggle" in the "under 34" versus "65 and older" age groups. (Round your answer to three decimal places.) toA student who is a Senior, has the following grading scheme and grades in a hypothetical Quantitative Reasoning course: Homework, Quizzes, Class Participation and Attendance are worth 25% Exam 1 is worth 20% Exam 2 is worth 20% Final exam is worth 35% Just before the final, she has earned the following grades (all out of 100): Homework grades: 100, 94.5, 0, 0, 0, 0, 0, 75, 100, 0, 84, 0 Exam 1: 100 Exam 2: 95 What is her homework average? What percent of the entire semester's grading has been completed so far? What is her course grade average for that work? What is the highest grade she can earn in the course if she is able to score 100 on the final? But wait! There is a 10 point BONUS on the exam. Suppose she scores 110. What is her grade then? The University scoring scale is as follows: A: 93 to 100; A– : 90 to 93, B+: 87 to 90 B: 83 to 87 B– : 80 to 83 C+ : 77 to 80, C: 73 to 77 C – : 70 to 73 D+: 67 to 70 D: 63 to 67 D– : 60 to 63, F: below 60.
- According to a study, approximately 60% of US adults believe that they have achieved, or are within reach of, the "American Dream" (that is, home ownership and financial stability). Now consider a random sample of 400 US adults. What is the probablity that over 65% of the sampled adults believe they have reached or are optimistic about reaching the American Dream? NEED ANSWER! No explanattion pleaseDo ethnic group and gender influence the type of care that a heart patient receives? The following pas- sage is from the article “Heart Care Reflects Race and Sex, Not Symptoms” (USA Today, February 25, 1999, reprinted with permission):Previous research suggested blacks and women were less likely than whites and men to get cardiac cathe- terization or coronary bypass surgery for chest pain or a heart attack. Scientists blamed differences in illness severity, insurance coverage, patient preference, and health care access. The researchers eliminated those differences by videotaping actors—two black men, two black women, two white men, and two white women—describing chest pain from identical scripts. They wore identical gowns, used identical gestures, and were taped from the same position. Researchers asked 720 primary care doctors at meetings of the American College of Physicians or the American Academy of Family Physicians to watch a tape and recommend care. The doctors thought the…24) Some research has shown that swearing can help reduce ratings of pain (Stephens, Atkins, & Kingston, 2009). In one such study, each participant was asked to plunge a hand into icy water and keep it there as long as the pain would allow. In one condition, the participants repeated their favorite curse words while their hands were in the water. In the other condition, the participants repeated a neutral word. In addition to lowering the participants’ perception of pain, swearing also increased the amount of time they were able to tolerate the pain. Data similar to the results obtained in their study are shown in the following table. Amount of Time (in Seconds) Participant Swear Words Neutral Words 1 94 59 2 70 61 3 52 47 4 83 60 5 46 35 6 117 92 7 69 53 8 39 30 9 51 56 10 73 61 Do these data indicate a significant difference in pain tolerance between the two conditions?…
- AD (Alzheimer's disease) causes progressive cognitive impairment. A diagnostic blood test for AD was proposed. An evaluation of the blood text involved fifty known AD patients and forty control who did not have AD. Of those who had AD, forty eight tested positive on the blood test and two tested negative. Of those without AD, three tested positive on the blood test and thirty seven tested negative. g. What is the NPV? Use this in a sentence explaining to a person what their negative test results suggests.A social psychologist wants to investigate whether stereotypes can be used to achieve positive outcomes. To explore this, the researcher randomly assigns 9 females to one condition in which participants were primed with a positive stereotype where they were asked to read a paragraph reminding them that Asians are stereotypically believed to be good at mathematics. Another 9 participants were primed with a neutral paragraph stating that many individuals find mathematics difficult and that many overcome this difficulty by focusing on the task at hand. After reading their assigned paragraph, both groups then completed a series of timed mathematical tasks. Adopting a significance or alpha-level of 5% (i.e., .05 probability), what is the two-tailed critical t value cut-off for this study? ±2.120 ±2.307 ±2.263 ±2.110A high school track coach wanted to test whether giving the students an energy drink could affect performance during the 100 meter race. The coach split the 26 boys into two equal sized groups, where Group 1 was given the energy drink and Group 2 was not. The 100 meter race times were recorded during practice and shown in the table below. What inference can be made about the results? Group 1 Group 2 12.2 13 12.5 12.3 13.3 12.8 12.9 13 13 13.8 12.1 13 13 13 13 13 12.1 13 13 13 12.1 13 12.8 13 13 12.6 Mean: 12.7 Mean: 13 Since the simulation shows ( many cases or free cases )? where a mean difference of ( solve for this answer ) or less occurred when the groups were re-randomized, it can be inferred that the mean difference observed in the study was ( very possibly or very unlikely ) ?due to the random assignment of participants into groups, so the results of the study are (…
- A student compared organic food prices at Grocery 1 and Grocery 2. The same items were priced at each store. The first three items are shown in the accompanying Figure A. Choose the correct accompanying output (B or C) for the appropriate test, explaining why you chose that output. Then test the hypothesis that the population means are not equal using a significance level of 0.05. Assume i Figure A and Outputs Click the icon to view Figure A and the outputs. Which is the correct output (B or C) for the appropriate test? Explain. (Figure A) Food Grocery 1 0.89 Grocery 2 0.99 A. Output B is appropriate because the data are paired samples. Bananas/1 Ib Grape tomatoes/1 Ib Russet potato/5 Ib 4.19 4.49 B. Output C is appropriate because there are two samples. 4.69 4.49 C. Output B is appropriate because n2 25. (Figure B) D. Output C is appropriate because the data are independent samples. N Mean StDev SE Mean Test the hypothesis that the population means are not equal using a significance…In order to assess the effects of exercise on reducing cholesterol, a researcher took a random sample of fifty people from a local gym who exercised regularly and another random sample of fifty people from the surrounding community who did not exercise regularly. They all reported to a clinic to have their cholesterol measured. The technician measuring the cholesterol was not aware of whether or not subjects exercised regularly. This is a(n)... matched pairs experiment. double-blind experiment. observational study. single-blind experiment. a O bCheaters, scope of inference: Exercise 1.5 introduces a study where researchers studying the relationship between honesty, age, and self-control conducted an experiment on 160 children between the ages of 5 and 15. The researchers asked each child to toss a fair coin in private and to record the outcome (white or black) on a paper sheet, and said they would only reward children who report white. Half the students were explicitly told not to cheat and the others were not given any explicit instructions. Differences were observed in the cheating rates in the instruction and no instruction groups, as well as some differences across children's characteristics within each group. a) Identify the population of interest in the study. b) Identify the sample for this study. c) Can the results of the study can be generalized to the population? Should the findings of the study can be used to establish causal relationships.
