To ascertain the effectiveness of a new, quicker, and simpler test for identifying COVID-19, a study was undertaken involving 921 participants. With thistest, a positive result indicates the presence of COVID-19. Anegative result indicates the absence of COVID-19. Data collected to assess the effectivenessof this new test revealed:• 301 of the participants confirmed they actually had COVID-19, with the other participants confirming they actually did not have CCOVID-19.• 17 participants actually had COVID-19 and produced a negative test result.• 448 participants produced a negative tost result.A participant from the study is chosen at random. What is the probability the participant actually has COVID-19 or the test is positive? (3 decimal places)

Answered: Image /qna-images/answer/5941feff-1c82-4602-87ba-5901b2c01b4b.jpg

Answered: To ascertain the effectiveness of a…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A researcher is concerned about Australians’ physical activity during the lockdown. S/he wants to understand whether the frequency of physical activity during the COVID-19 lockdown depends on the types of physical activity. The following table shows the frequency of doing different types of physical activity during lockdown in a random sample of Australians (n= 218218). Use the table to answer the questions which follow. What proportion of the participants in the study did physical activity several times? What proportion of the Running or jogging participants exercised weekly? What proportion of the participants who exercised daily were Yoga participants? The researcher would like to answer the following research question: “Do Australians’ frequency of physical activity during lockdown depends on the exercise types?” S/he sets up the following null and alternative hypotheses to answer the research question. ?0:H0: There is no association between types of physical activity and…
Suppose a researcher conducted a study examining the effectiveness of font type (OpenDyslexic vs. Times New Roman) on reading comprehension for 20 students with dyslexia. After reading a passage in one of the two fonts, 10 students in each of the two font conditions completed a brief reading comprehension test of 15 questions. The number of correctly answered questions for each student is given in the table below: Complete the following in the context of conducting data analysis/ a. Calculate the average number of correct test questions for each group b. Calculate the standard deviation for each group c. Calculate the median and mode for both groups d. Calculate the interquartile range for each group OpenDyslexic 10 9 11 8 24867 12 14 Times New Roman 6675 & Na 43 4 2 8 9
The Ministry of Health Malaysia is interested in the post-shot side effects of a particular Covid-19 vaccine on teenagers. The manufacturer of a particular vaccine claims that 50% of the second dose recipients would develop mild side effects than others. The Covid-19 working group performed a hypothesis test to determine if the claimed percentage by the vaccine manufacturer is trustworthy. They sampled 100 teenage vaccine recipients and found that 53 of the recipients had mild side effects after their second dose of Covid-19 vaccine administration. A 5% level of significance was chosen for the hypothesis test. i. S. «he null and alternative hypothesis. ii. State the Type I . vpe II error ii. Is Type I err pi ll erro. re important to the ministry of health? Why? iv lustrate the level of significance and the tical value in a graph. Provide your conclusion. Illustrate the evidence to support your conclusion using v. a graph.
The Ministry of Health Malaysia is interested in the post-shot side effects of a particular Covid-19 vaccine on teenagers. The manufacturer of a particular vaccine claims that 50% of the second dose recipients would develop mild side effects than others. The Covid-19 working group performed a hypothesis test to determine if the claimed percentage by the vaccine manufacturer is trustworthy. They sampled 100 teenage vaccine recipients and found that 53 of the recipients had mild side effects after their second dose of Covid-19 vaccine administration. A 5% level of significance was chosen for the hypothesis test. i. State the null and alternative hypothesis. ii. State the Type I and Type II errors. iii. Is Type I error or Type II error more important to the ministry of health? Why?
The Ministry of Health Malaysia is interested in the post-shot side effects of a particular Covid-19 vaccine on teenagers. The manufacturer of a particular vaccine claims that 50% of the second dose recipients would develop mild side effects than others. The Covid-19 working group performed a hypothesis test to determine if the claimed percentage by the vaccine manufacturer is trustworthy. They sampled 100 teenage vaccine recipients and found that 53 of the recipients had mild side effects after their second dose of Covid-19 vaccine administration. A 5% level of significance was chosen for the hypothesis test. iv. Illustrate the level of significance and the critical value in a graph.
Researchers conducted trials to investigate the effects of color on creativity. Subjects with a. Red background were asked to think of creative uses for a brick; other subjects with a blue background were given the same task. Responses were scored by a panel of judges and results from scores of creativity are given in the accompanying table. Higher scores correspond to more creativity. The researchers make the claim that "blue enhances performance on a creative task". Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. what are the null and alternative hypothesis identify the test statistic ifentify the p value
Subjects with preexisting cardiovascular symptoms who were receiving subutramine, an appetite suppressant, were found to be at increased risk of cardiovascular events while taking the drug. The study included 10162 overweight or obese subjects with preexisting cardiovascular disease and/or type 22 diabetes. The subjects were randomly assigned to subutramine (5083 subjects) or a placebo (5079 subjects) in a double‑blind fashion. The primary outcome measured was the occurrence of any of the following events: nonfatal myocardial infarction or stroke, resuscitation after cardiac arrest, or cardiovascular death. The primary outcome was observed in 572 subjects in the subutramine group and 506 subjects in the placebo group. Do the data give good reason to think that there is a difference between the proportions of treatment and placebo subjects who experienced the primary outcome? (Note that sibutramine has not been available in the United States since the end of 2010 due to its…
I will provide the required data in a seperate set Death Rate per 100,000 people and Donald Trump’s share of the popular vote. A group of political activists noticed that hesitancy to get the vaccine for COVID-19 seems particularly strong in states that Donald Trump won in the 2020 presidential election. They wondered whether there is a correlation between the COVID-19 death rate per 100,000 people per state and Donald Trump’s share of the popular vote in 2020 per the 50 states and District of Columbia. The death rate data was sorted from a Johns Hopkins University/CNN report. The Voting data was sourced from CNN. Question 1: A Priori Statistical Power Before collecting the data, they decided to calculate a priori statistical power to determine how large a sample is needed to achieve 80% statistical power. G*Power Conduct an a priori power analysis using G*Power. (If you are not using a Windows or Macintosh computer use Statistics Kingdom to estimate sample size) Here are the setting…
I will provide the required data in a seperate set Death Rate per 100,000 people and Donald Trump’s share of the popular vote. A group of political activists noticed that hesitancy to get the vaccine for COVID-19 seems particularly strong in states that Donald Trump won in the 2020 presidential election. They wondered whether there is a correlation between the COVID-19 death rate per 100,000 people per state and Donald Trump’s share of the popular vote in 2020 per the 50 states and District of Columbia. The death rate data was sorted from a Johns Hopkins University/CNN report. The Voting data was sourced from CNN. Question 1: A Priori Statistical Power Before collecting the data, they decided to calculate a priori statistical power to determine how large a sample is needed to achieve 80% statistical power. G*Power Conduct an a priori power analysis using G*Power. (If you are not using a Windows or Macintosh computer use Statistics Kingdom to estimate sample size) Here are the setting…
7.50 Antigens for a parasitic roundworm in birds. Ascaridia galli is a parasitic roundworm that attacks the intestines of birds, especially chickens and turkeys. Scientists are work- ing on a synthetic vaccine (antigen) for the parasite. The success of the vaccine hinges on the characteristics of DNA in peptide (protein) produced by the antigen. In the jour- nal Gene Therapy and Molecular Biology (June 2009), sci- entists tested alleles of antigen-produced protein for level of peptide. For a sample of 4 alleles, the mean peptide score was 1.43 and the standard deviation was .13. a. Use this information to construct a 90% confidence in- terval for the true mean peptide score in alleles of the antigen-produced protein. b. Interpret the interval for the scientists. c. What is meant by the phrase “90% confidence"?
With two COVID-19 vaccines now in the final stages of approval for use in the U.S., 63% of Americans say they are willing to receive a COVID-19 vaccination approved by the Food and Drug Administration (FDA), up from 50% who said this in September. The December results came from a Gallup poll conducted Nov. 16-29, 2020, with a random sample of 2,968 adults. The September results came from a Gallup poll conducted Sept. 14-27, 2020, with a random sample of 2,730 adults. Does this data suggest that the share of Americans who say they plan to get vaccinated has increased? State and test the relevant hypotheses at significance level 0.10 by using the P-value method.
The following is an abstract from the journal Exceptional Children (O’Connor, White, & Swanson, 2007): Abstract: This research evaluated two methods to improve the reading fluency of struggling readers. Poor readers in grades 2 and 4 with (n = 17) and without (n = 20) learning disabilities were randomly assigned to one of two fluency practice variations or to a control group. Students in the treatments practiced reading aloud under repeated or continuous reading conditions with an adult listener in 15-min sessions, 3 days per week for 14 weeks. For students in the treatment conditions, growth curve analyses revealed significant differences in fluency and reading comprehension over students in the control. We found no significant differences between practice conditions. Consider the following elements in this study: (1) poor readers (2) students in grades 2 and 4 (3) students with and without learning disabilities (4) reading aloud with an adult listener or not (5) repeated or…

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