Answered: Choosing four people at random from the…

Choosing four people at random from the US population and none of them having diabetes, if 8.3% of the population has diabetes

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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A business sent out a survey to it's customers in two groups; one under 30 years old (group 1) and one over 30 years old (group 2). Customers were asked if they preferred to purchase items online or in store. Out of 300 customers under 30 (group 1), 180 said that they purchased online. Out of 300 customers over 30 (group 2), 170 said that they purchased online. Is there a difference in the population proportion who purchased online? The business wanted to test the hypothesis Ho: P2 P1 O versus Ha: P2 - P₁ does not equal Ö. What is the p-value? Use JMP and round the p-value to two decimal places.
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You read a newspaper article that describes a study of whether stress management can help reduce heart attacks. The 107 subjects all had reduced blood flow to the heart and so were at risk of a heart attack. They were assigned at random to three groups. The article goes on to say: One group took a four-month stress management program, another underwent a four-month exercise program, and the third received usual heart care from their personal physicians. In the next three years, only three of the 33 people in the stress management group suffered "cardiac events, " defined as a fatal or non-fatal heart attack or a surgical procedure such as a bypass or angioplasty. In the same period, seven of the 34 people in the exercise group and 12 out of the 40 patients in usual care group suffered such events. Find the proportion of cells with expected counts greater than 5 under the null hypothesis of no difference among treatments. (Use decimal notation. Give your answer as an exact number.)…
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in a survey of 14 college students, it was found that 9 were taking an English class, 7 were taking a math class, and 6 were taking both English and math. How many students were taking a math class only? How many students were taking an English class only? How many students were taking neither.
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It's all about COMBINATION - From a population of 50 households, in how many ways can a researcher select a sample with a size of 10?
A researcher designs a study that assesses the extent of alcohol abuse among college students. A large public university campus, which has an undergraduate population of approximately 10,000 students, is chosen. Advertisements for the study are placed on campus , and 58 students (36 men, 20 women) volunteer for the anonymous study. Eighty percent of the responses are from college freshmen. The students complete an anonymous questionnaire about their drinking habits, such as amount and frequency of alcohol use. Students also are asked about their grades and academic majors. These results are combined to yield general statistics about alcohol abuse among all college students. Which of the following types of bias is present in this study design? a. Bias due to confoundingb. Bias in selection of participantsc. Bias in classification of interventionsd. Bias in outcome measurements
In a series of studies, Sebastian Deri and his colleagues (2017) asked multiple groups about the number of friend groups they had and how often they attended different social events. They then asked participants how they thought their own numbers compared to other people's: Did participants see themselves as less social, the same as, or more social than others? In the first study, the researchers reported that: "Three hundred four participants from Amazon's Mechanical Turk (150 women; Mage = 37.1; 78% White, 10% Black, and 6% Asian) completed a survey in exchange for modest payment" (p. 860). What do the researchers mean by "Amazon's Mechanical Turk" with respect to their sample of participants? O A. An archival data set that already exists and from which researchers can use data O B. An online tool that researchers can use to recruit people to participate in research in exchange for a small payment O C. An e-book sold by Amazon that includes contact information for possible…
2) The rabies vaccine for dogs can save your dog's life. If your dog bites another animal or is on the receiving end of a bite, the vaccine can protect them from a dangerous and potentially fatal illness. Furthermore, in most places, the rabies vaccine for dogs is legally required. The NYC Department of Health wants to know if LESS than 95% of the dogs in the city have been vaccinated with their rabies vaccine. 158,045 of the 165,000 dogs examined had their rabies shots. Risk no more than 5% Type I error. What is the P^? (round to nearest thousandth)