Dr. x was interested in studying the hand-washing habits of York KINE students, so they sampled 100 KINE students and found that students on average wash their hands 125 times a month, with an SEM of 3. What is the probability that students wash their hands more than 146 times a month? a. 75.8% Ob. 0.50% O c. 24.2% Od. 0.01% e. 99.9% Of. 50% g. 71.19%
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- Every year, the vetrinary hospital at a major research university treats a number of horses that have stones called enteroliths in their guts. AS sample of 20 years shows that on average about 2% of horses presenting at the veterinary hospital are treated for enteroliths. Some breeds of horses seem more prone to developing enteroliths than others. Below is a table with the distribution of enteroliths among the breeds. breed Fijian Thoroughbred Morgan Quarter Horse probability 0.4 0.2 0.3 ? The probability that a horse arriving at the veterinary hospital is not a Fijian, Thoroughbred, or a Quarter horse is?The WKU Herald reported that many students are unhappy with the cancellation of Spring Break. A sample of of 66 WKU students' opinion on the cancellation of Spring Break was collected. If 12% of all young people feel that WKU should have cancelled Spring Break, what is the probability that the proportion of those in the sample who feel that WKU should have cancelled Spring Break will be less than.1768? O a. 9222 O b. .4222 C. .0568 O d. .0778It was reported that 53% of people who had coronary bypass surgery in a recent year were over the age of 65. Fifteen coronary bypass patients are sampled. What is the probability that exactly 9 of them are over the age of 65? O 60.95% O 78.75% O 39.05% O 17.80%
- Alex makes mistakes in a with an average of 1.2 mistakes per class. In a given class, what is the probability that Alex makes exactly 4 mistakes? NOTE: ROUND OFF your answer to FOUR DECIMAL places. What is the product of the number of trials in a Bernoulli Experiment and the probability of a “successful” trial?A project conducted by the Australian Federal Office of Road Safety asked people many questions about their cars. One question was the reason that a person chooses a given car, and that data is in table #4.1.4 ("Car preferences," 2013). Table #4.1.4: Reason for Choosing a Car Safety Reliability Cost Performance Comfort Looks 84 62 46 34 47 27 Find the probability a person chooses a car for each of the given reasonsA random experiment was run 23 times with groups of 24 mice. Each time the experiment was run, 4 mice were initially infected with a disease; the remaining mice were susceptible to contracting the disease. After one day, they measured the number of number of newly infected mice (not including those originally infected). They found the following frequency table: Newly infected mice Newly infected mice 4 5 6 7 8 9 10 11 Frequency 1 2 2 6 5 4 2 1 Determine the expected probability of transmission for this particular variant of disease. Round your answer to three decimal places.
- Answer part a and bThe table below shows the results of a survey that asked the involvement of a person in a charity work. The person’s gender and response were recorded. Find the probability of selecting a female who never volunteers a.0.29 b.0.57 c.0.51 d.0,49The data below was obtained from a random survey of 459459 people. The participants were asked their political party and whether they approve, disapprove, or have no opinion of how the president is doing his job. The results of the survey are as follows: Democrat Republican Independent Total Approve 103 56 8 167 Disapprove 109 123 5 237 Undecided 27 28 5 55 Total 239 207 18 459 If a person if selected at random, what is the empirical probability that the the person approves of the job the president is doing or is an independent?
- A poll asked people with and without children under 18 years old if they frequently experienced stress. The results are shown in the accompanying table. Complete parts (a) through (c) below. Frequently Experience Stress Yes No Total With child under 296 234 530 18 уears No child under 196 314 510 18 years Total 492 548 1040 a. Find the probability that a randomly chosen person from this group said "Yes," given that the person has a child under 18 years old. (Type an integer or decimal rounded to four decimal places as needed.) b. Find the probability that a randomly chosen person from this group said "Yes," given that the person does not have a child under 18 years old. (Type an integer or decimal rounded to four decimal places as needed.) c. Find the probability that a randomly chosen person from this group said "Yes" or had a child under 18 years old. (Type an integer or decimal rounded to four decimal places as needed.)a. What is the probability of seeing positive change? b. What is the probability of seeing positive change given that the tree is oak? c. Do the data suggest effect and tree type are independent events? yes or no