3. A recent study concerning knee injuries of football players compared two types of football shoes. Out of a randomly chosen group of 1440 players, 240 used multicleated shoes and 1200 used more conventional football shoes. All played on natural grass. Of those using the multicleated shoes, 13 suffered knee injuries. Of those using conventional shoes, 78 suffered knee injuries. (a) Test the hypothesis that the probability of a knee injury is the same for both groups of players. Use the 5 percent level of significance. (b) Are the given data strong enough to establish that the multicleated shoes are superior to the conventional ones in terms of reducing the probability of a knee injury?

3. A recent study concerning knee injuries of football players compared two types of football shoes. Out of a randomly chosen group of 1440 players, 240 used multicleated shoes and 1200 used more conventional football shoes. All played on natural grass. Of those using the multicleated shoes, 13 suffered knee injuries. Of those using conventional shoes, 78 suffered knee injuries. (a) Test the hypothesis that the probability of a knee injury is the same for both groups of players. Use the 5 percent level of significance. (b) Are the given data strong enough to establish that the multicleated shoes are superior to the conventional ones in terms of reducing the probability of a knee injury?

Name: 3. A recent study concerning knee injuries of football players compar
Uploaded: 2024-03-20T07:06:41.000Z
Channel: Bartleby
Description: 3. A recent study concerning knee injuries of football players compared two types of football shoes. Out of arandomly chosen group of 1440 players, 240 used multicleated shoes and 1200 used more conventionalfootball shoes. All played on natural gras

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Based on a smartphone survey, assume that 43% of adults with smartphones use them in theaters. In a separate survey of 241 adults with smartphones, it is found that 101 use them in theaters. a. If the 43% rate is correct, find the probability of getting 101 or fewer smartphone owners who use them in theaters. b. Is the result of 101 significantly low?
The Food Marketing Institute shows that 17% of households spend more than $100 per week on groceries. Assume the population proportion is p = .17 and a simple random sample of 800 households will be selected from the population. What is the random variable in this narrative?
In an experiment, college students were given either four quarters or a $1 bill and they could either keep the money or spend it on gum. The results are summarized in the table. Students Given Four Quarters Students Given a $1 Bill O.A.0.659 Find the probability of randomly selecting a student who spent the money, given that the student was given four quarters. OB.0.675 OC.0.292 Purchased Gum 27 14 OD.0.307 Kept the Money 13 34
Organ Donors USA Today provided information about a survey of 5100 adult Internet users. Of the respondents, 2346 said they are willing to donate organs after death. In this survey conducted for Donate Life America, 100 adults were surveyed in each state and the District of Columbia, and results were weighted to account for the different state population sizes. a. What percentage of respondents said that they are willing to donate organs after death? b. Based on the poll results, what is the probability of randomly selecting an adult who is willing to donate organs after death? c. What term is used to describe the sampling method of randomly selecting 100 adults from each state and the District of Columbia?
The average number of children a Japanese woman has in her lifetime is 1.37. Suppose that one Japanese woman is randomly chosen. In words, define the random variable X. List the values that X may take on. Find the probability that she has no children. Find the probability that she has fewer children than the Japanese average. Find the probability that she has more children than the Japanese average.
Charlie tests whether there are more male or female coffee drinkers at his university's coffee shop. One day, he collects data on gender from 76 customers. If the gender ratio is 55 percent female, what is the expected number of male customers if the null hypothesis is true?
Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 95 people in the 18-21 age bracket and finds that 81 of them respond and 14 refuse to respond. When 260 people in the 22-29 age bracket are contacted, 235 respond and 25 refuse to respond. Assume that 1 of the 355 people is randomly selected. Find the probability of getting someone in the 22-29 age bracket or someone who responds.Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol.P(22-29 or responds) =
Two candidates are running for president: John Democrat and Joe Republican. A recent survey concluded that John Democrat had a probability of 0.55 to win the election. One thousand people are interviewed at random about whom they would vote for. A random variable X is defined as the number of people who said they would vote for Joe Republican. Find the expected value of the random variable
The table below provides another look at the data presented in item 1. This table includes a third variable, stone size, making a three-way table (i.e. two 2 X 2 tables). ô อิ = 1 Stones size Small = kidney stones. Find and 1 2 Large 1 Outcome Success Failure Success Failure Let represent the odds ratio for the 2 X 2 table for small kidney stones, and let represent the odds ratio for the 2 X 2 table for large Round your answers to 2 places after the decimal. Treatment A 81 6 2 192 71 Treatment B 234 36 55 25 2
Three students scheduled interviews for summer employment at the Tiket.com. In each case the interview results in either an offer for a position or no offer. Experimental outcomes are defined in terms of the results of the three interviews.a. List the experimental outcomes.b. Define a random variable that represents the number of offers made. Is the random variable continuous?c. Show the value of the random variable for each of the experimental outcomes
2. 46% of Canadians believe in ghosts. We randomly select a sample of 80 Canadians and ask them if they believe in ghosts. Let the random variable X be the number of Canadians in the sample who believe in ghosts. What is the approximate probability that there will be exactly 43 individuals who believe in ghosts in the sample?
A new store is deciding what pens to stock up on. The owner wants to know if each colour of pen is equally popular so they can start ordering supplies. To find out, the owner selects a random sample of 100 students and asks them "What colour of pen do you prefer: Blue, Black, Red, or Green?" Here is the data collected from the sample of students: Blue = 35 people Black 31 people Red = 21 people Green 13 people = Calculate the appropriate test statistic for these data to determine if there is a preference in pen colour. Enter your calculated statistic below Answer: