Answered: 1. In a survey of university students…

Math

Advanced Math

1. In a survey of university students 64 had taken mathematics course

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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The Flying Pig is a marathon (26.2 miles long) running race held every year in Cincinnati, Ohio. Suppose that the following data show the ages for a sample of 40 half-marathoners. 24 54 31 62 30 39 35 61 34 57 51 41 68 54 51 34 35 38 28 65 63 37 64 38 33 56 25 70 21 57 49 62 a. Construct a stretched stem-and-leaf display. Note: if there is nothing to fill in the box, leave it empty. If your answer is "zero" enter "0". X X ✓ ✔ ✔ 2 ✔ ✔ ✔ 2 × X X × ✔ 3 3 4 4 5 5 6 6 7 0 0 b. What age group had the largest number of runners? 35-39 c. What age occurred most frequently? Note: if there are any, choose the smallest of them. X 0 ✔ X > › X › › X > XX XX > * x x X XX x x XX x X > X X X x > › › X 3 X ✔ ✔ M ✓ 1 55 54 23 46 4 70 1 71 65 44 41 * › › › › > > S M > ✓ ✔ ♡ 0 3 > › › › › › › › › › › S S > › › › › › 6 6
10.
31. Mortgage Industry Employees. In an issue of National Mort- gage News, a special report was published on publicly traded mort- gage industry companies. A sample of 25 mortgage industry compa- nies had the following numbers of employees. 260 20,800 3,223 1,801 2,073 3,596 2,128 1,796 17,540 15 29,272 6,929 2,468 7,000 6,600 2,458 3,216 209 726 9,200 650 4,800 19,400 24,886 3,082 a. Obtain a normal probability plot of the data. b. Use part (a) to identify any outliers. c. Use part (a) to assess the normality of the variable under consideration.
Suppose that a random sample of size 1 is to be taken from a finite population of size N. a. How many possible samples are there?b. Identify the relationship between the possible sample means and the possible observations of the variable under consideration.c. What is the difference between taking a random sample of size 1 from a population and selecting a member at random from the population?
The following is an example of what type of study: You test a new toilet bowl cleaner by buying a bottle and cleaning your toilet. A) experiment B) observational D) sampling
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Provide an appropriate response. 1) In a survey, 26 voters were asked their ages. The results are shown below. Construct a histogram to represent the (with 5 classes beginning with a lower class limit of 19.5 and a class width of 10). What is the approximate age at center? 43 56 28 63 67 66 52 48 37 51 40 60 62 66 45 21 35 49 32 53 61 53 69 31 48 59
4. An insurance company conducted a study to determine the percentage of cardiologist who had been sued for malpractice in the past 10 years. The sample was randomly selected from a national directory of doctors. What is the sample for this study? Select one of the following: a) the number of doctors who are cardiologists b) all cardiologists in the directory c) each cardiologist selected randomly from the directory d) the responses to the question, “Have you been sued for malpractice in the past 10 years?"
Agreed to participate Did not agree to Participate Total Contacted 20 15 35 African American 12 15 27 Asian American 50 37 87 Latina, Hispanic 37 23 60 White 119 90 209 TOTALS To get familiar with the data, answer the following: a) What percentage of women overall were: African American Asian American Latina/Hispanic White b) What percentage of women agreed to participate overall?
18. "38% of adults in the United states regularly visit a doctor" This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. What is wrong with her survey?
Listed below are numbers of enrolled students (in thousands) and number of campus burglaries from a random sample of large colleges in 2017. A) After finding the undergraduate enrollment for a university in 2019, use it to predict the number of estimated burglaries on campus. B)What is the Undergrad Enrollment in 2019: (in thousands). C) what is the estimated number of burglaries? Enrollment 32 31 53 28 27 66 42 30 34 65 Burglaries 94 83 86 47 32 131 157 20 27 141
9) In examining the ability to complete a variety of information-seeking tasks, Nielsen Norman Group assigned randomly selected people who use iPhones to obtain the answers to a variety of questions like “How many calories are there typically in a slice of thin-crust pizza?” using either their iPhone or a desktop computer. a) State the Hypothesis to show the proportion of people finding the correct answer is lower when using an iPhone than a computer. b) The data below contains the results (either Correct or Incorrect) of the 500 people using iPhones and the 500 people accessing websites on a desktop computer. Use JMP software to test the hypothesis of part a). c) Using aplha = 0.05, draw a conclusion for the hypothesis test. Make sure you state your conclusion in the context of the problem. Answer Answer Type Correct Incorrect Total Computer 400 100 500 Iphone 375 125 500 1000