2. In a population it is estimated that 20% have a desired trait of interest for the researcher.The researcher wants to know how many people on average he has to draw from apopulation to get 2 people with the trait. Use rows 20-24 of the Random Number Table tocarry out the simulation. Explain clearly how you set up the problem and report yourfindings.Answer:

Answered: 2. In a population it is estimated that…

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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Running heart rate 50% of 18-25 year-olds will experience a heart rate of more than 120 beats per minute (bpm) after running a mile. Jose is a physician who is researching to what extent running affects heart rate in 18-25 year-olds. He believes that less than Jose recruits a random sample of 464 people between the ages of 18 and 25 to run a mile and records their heart rate. He finds that 184 have a heart rate of more than 120 bpm. Round all calculated answers to 4 decimal places. 1. Correctly state the null and alternative hypotheses. Но : р На : р くV 2. If you assume that the observations in the sample are independent, what is the smallest value the sample size could be to meet the conditions for this hypothesis test? OA. 10 ОВ. 25 С. 184 D. 20 O E. None of the above 3. Calculate the test statistic for this hypothesis test. 4. Calculate the p-value. 5. Which of the statements below are correct interpretations of the p-value? You should choose all that are correct interpretations. A.…
At an art camp, students must specialize in one artistic medium. The camp director looked at her records to see which specialties students chose last summer. sculpture 11 metalworking 4 drawing 13 ceramics 12 Considering this data, how many of the next 50 students to sign up for camp this summer should you expect to specialize in ceramics? students Submit W e S
Help.Explain
A car dealership is deciding the proportion of cars they will order with cloth seats. You have been assigned the task of surveying randomly selected car owners to determine the percentage of car owners that prefer cloth seats. How many car owners must you survey to be 99% confident that the sample is within 5 percentage points of the true population percentage? Assume that records from the past indicate that 30% of car owners prefer cloth seats.
Please answer the question in the photo. Thank you!
The scenario A professor wanted to learn more about the students at her university with regards to whether they prefer in-person or online classes. She randomly sent out surveys to students at the university . Of the students that responded, % prefer taking online classes. The questions Use the information from the scenario to answer the following: What is the population that this study is trying to get information about? What is the variable used for the study? What type of variable is the variable in question 2? What is the sample statistic for this study? What is the parameter of interest for this study? (the population parameter they are trying to gather information about)
A researcher is interested in determining if sleeping more hours the night before an exam will improve student math practice test scores. She randomly divides the class into two groups. One group is instructed to sleep 9 hours. The other group is instructed to sleep 6 hours. Students were asked to complete a practice math test the following day. The researcher then compares the average test score of each group. What is the DV? O the class O the researcher average test score O sleep (9 hours vs 7 hours)
The first test a doctor would order to determine whether a person is infected with HIV (the virus that causes AIDS) is the ELISA test. It detects antibodies and antigens for HIV. A study in Statistical Science by J. Gastwirth estimated that, if the person is actually infected with HIV, this test produces a positive result 97.7% of the time. If a person is not infected with HIV, the test result is negative 92.6% of the time. According the the US Centers for Disease Control (CDC), an estimated 1.1 million Americans out of a population of 321 million were infected with HIV in 2015. Using the information above, determine the probability that a randomly selected person whose ELISA test is positive actually is infected with HIV? a. What is the probability that a randomly selected American is infected with HIV? b. Using the answer to part (a) and the conditional probabilities of positive and negative ELISA test results, fill out the contingency table below: ELISA Test Result…
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A city has 4 voting districts. Records from previous years show the proportion of registered voters that voted in previous elections for each district. A political analyst wants to see if those proportions have changed for this year's upcoming elections. The political analyst randomly samples 123 registered voters and asks them which district they live in and if they have voted yet. H0: Pa = 0.3: Pb = 0.2; Pc = 0.2; Pd = 0.3 Test the claim that there is a difference in the proportions using a α =0.01. Round all answers to at least 4 decimal places. a.) Complete the table: District: A, B, C, D; Observed: 36, 32, 19, 36 ( Respectively, matching Category Letters. Total of Observed: 123) b.) What is the chi-square test-statistic for this data? X 2=______ c. For significance level alpha , what is the chi-square Critical Value? Critical Value = _________________ d. What would be the correct conclusion for this hypothesis test?
In Class Exercise You are asked to evaluate the effect of a fast acting blood pressure medication. You take a random sample of 200 people from the population and assign half of them at random to take the pill. Of the 100 you told to take the pil| 25 refuse and 75 take it. At the end of a week you check the blood pressure of the group assigned to get the pill and it is 120 on average and the blood pressure of the group assigned to control is 127.5 on average. 1. What is Y;, what is Z;, what is D;? 2. What is the first stage? Estimate and interpret 3. What is the reduced form? Estimate and interpret. 4. What is the effect of the drug on blood pressure?
Basketball players can take shots worth 333 points, 222 points, or 111 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 333-point 888 121212 Expected 10.3410.3410, point, 34 9.669.669, point, 66 222-point 404040 373737 Expected 39.8339.8339, point, 83 37.1737.1737, point, 17 111-point 121212 777 Expected 9.839.839, point, 83 9.179.179, point, 17 �2=2.097, DF=2, P-value=0.350χ2=2.097, DF=2, P-value=0.350\chi, squared, equals, 2, point, 097, comma, start text, space, D, F, end text, equals, 2, comma, start text, space, P, negative, v, a, l, u, e, end text,…

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