A typing school claims that in a six-week intensive course, it can trainstudents to type, on the average, at least 60 words per minute. A random sample of 15graduates is given a typing test and the median number of words per minute typed by eachof these students is given below. Test the hypothesis that the median typing speed ofgraduates is at least 60 words per minute.WPM-60diStudentsWords per minuteA81+2176+1653- 771+1166+ 6F59- 1G88+2873+1380+20J66+ 6K.58- 2L70+10M60N56- 455- 5S = 5

Answered: Image /qna-images/answer/c30390a3-33a9-446a-8481-73e571565300.jpg

Answered: A typing school claims that in a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a memory test, the test subjects are given a large number and are asked to memorize it. Historical records show that 80% of test subjects pass the test. To pass the test, a subject must exactly repeat all the digits in the number after two hours. A random sample of 625 people to take the memory test is going to be chosen. Let p be the proportion of people in the sample who pass the test. Answer the following. (If necessary, consult a list of formulas.) (a) Find the mean of P. 0 (b) Find the standard deviation of p. 0 (c) Compute an approximation for P(P >0.84), which is the probability that more than 84% of the people in the sample pass the test. Round your answer to four decimal places. 0 X
A worm in my apple-Codling moths are a devastating insect pest for apples. Each spring, adult moths lay their eggs on or around developing appies. When the eggs hatch the larva, or wom, tunnels into the apple, where they feed on the fruit and develop for three to five weeks. Cain has developed a scanning machine to detect the presence of larvae in appies. If the apple is infested with larvae, the machine reports a positive result 84.3% of the time. If the apple is not infested, the machine reports a negative result 64.6% of the time Round all answers to 4 decimal places 1. Suppose that 8.2% of apples in an orchard are infested with larvae. Assume a theoretical population of 10,000 apples and construct the contingency table for this scenario Test Negative Infested Not infested Total Test Positive 2. What proportion of apples will test positive for larvae infestation? 3. What proportion of apples that test positive for larvae infestation would we expect to not actually be infested with…
Basketball players can take shots worth 3 points, 2 points, or 1 point. A scout is assessing two players- Tabitha and Lauren-who play for different teams in different leagues. The scout wonders if they have similar or different shot selections. They take a random sample of Tabitha's games and a separate random sample of Lauren's games. They tally how many of each type of shot the players attempted in those games. Here is a summary and the results of a chi-square test: Chi-square test: Shot vs. player Tabitha Lauren 3-point 8 12 Expected 10.34 9.66 2-point 40 37 Expected 39.83 37.17 1-point 12 Expected 9.83 9.17 x² = 2.097, DF = 2, P-value = 0.350 %3D Assume that all conditions for inference were met. At the a = 0.05 significance level, what is the most appropriate conclusion to draw from this test? Choose 1 answer: This is convincing evidence that the distribution of shot type differs between Tabitha and Lauren.
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A manufacturing plant makes computer chips 24 hours a day. Employees work one of three, 8 hour shifts during the morning (2am-10am), day (10am-6pm), and night (6pm-2am). Below are data on the number of defective chips on a randomly chosen 24 hour period. Shift Morning Day Night Number of Defective Chips 23 26 47 Total Chips Manufactured 330 330 330 The plant manager thinks there might be more defective computer chips manufactured during the night shift compared to the day shift. Give appropriate statistical evidence to test the managers' claim.
If Study determines the difference an average salaries are so population of people with blue eyes and people with brown eyes is not significant than a population of blue are people in brown and people are ______ different salaries.
SWIMMER’S FLEXIBILITY STUDY Swimming requires complete body movement as defined in sports science. A swimmer’s flexibility helps in his/her movement in water, thus making him/her a faster swimmer. In a study conducted to determine if there is an improvement in swim speed after doing flexibility exercise, 15 swimmers of the same characteristics were randomly selected. They were asked to do a 25-m freestyle and their swim speed (in seconds) were recorded. After this, a flexibility exercise was done. All the swimmers were then asked to do another 25-m freestyle and their swim speed (in seconds) were also recorded. The data collected are given below and can also be found in the worksheet “swim_speed”of excel file “exer3_data.xlsx”. R outputs can be found in the file “exer3_outputs.pdf”.(Use before – after in your computations Swimmer 1 2 3 4 5 6 7 8 Before 16.87 19.42 20.04 22.82 24.24 17.76 23.91 17.17 After 15.82 18.47 20.43 21.76 23.88 18.12 20.96 16.03 Swimmer 9 10 11 12…
answer in 30 minutes.
Blood type and survival rate - In early 2020, medical researchers in China investigated the association between blood type (A, B, AB and O) and severity of COVID-19 symptoms. The researchers collected information about blood type from patients in Jinyintan hospital in Wuhan, China, in January 2020. The table below summarizes the information for a sample of 867 patients from this investigation. COVID patients Survived Died Total Blood Type A 285 42 327 Blood Type B 204 25 229 Blood Type AB 78 9 87 Blood Type O 199 25 224 Total 766 101 867 Round all answers to 4 decimal places. 1. What proportion of these COVID-19 patients had blood type AB? 2. What proportion of these COVID-19 patients died? 3. If we randomly selected one of these patients, what is the probability the patient both had blood type A and survived? 4. What is the probability a randomly selected COVID-19 patient from this sample with blood type AB died?

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