How contagious and dangerous is the Delta variant?Medical study reports that viral loads in Delta infections are 1000 times higher than those in infections caused by other variants. Data show that Delta variant affectsabout 62 out of 100 people. In response to this information, the World Health Organisation (WHO) regards Delta as"the fastest and fittest" variant so far. The main type of COVID-19 Delta variant test is nucleic acid detection test and the test is quite accurate. We know that theprobability that the test result is positive given that the person does not have Delta variant is only 1.5%, and the probability that the test result is negative given that theperson has Delta variant is only 0.5%. A random person in Perth gets tested for COVID-19 Delta variant and the result comes back positive. What is the probability thatthe person has Delta variant?O A. 0.9908O B. 0.9926O C. 0.9939O D. 0,9969

Answered: Image /qna-images/answer/327f37d3-96f9-4245-ab71-e172a9c9cfe3.jpg

Answered: How contagious and dangerous is the…

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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The Paleo diet allows only for foods that humans typically consumed over the last 2.5 million years, excluding those agriculture-type foods that arose during the last 10,000 years or so. Researchers randomly divided 500 volunteers into two equal-sized groups. One group spent 6 months on the Paleo diet. The other group received a pamphlet about controlling portion sizes. A randomized treatment assignment was performed, and at the beginning of the study, the average difference in weights between the two groups was about 0 pounds. After the study, the Paleo group had lost an average of 7.1 pounds with a standard deviation of 22.75 pounds while the control group had lost an average of 4.5 pounds with a standard deviation of 11.5 pounds. After failing to reject the null hypothesis support your answer with a p-value (a) P-value = _______
There is a current chemotherapy drug available that is extremely successful in treating an aggressive form of breast cancer. This drug has as a serious side effect in that 20% of the recipients will subsequently go on to develop ALL, an often untreatable and fatal form of leukemia. The pharmaceutical company is developing a modified version of this drug and long term clinical trials are being conducted on 214 women afflicted with this aggressive form of breast cancer. The trials have indicated 31 subsequent cases of ALL. State and test the hypothesis that there is no difference in the proportion of ALL cases between the two chemotherapy drugs against the alternative that there is a difference. Set alpha equal to 0.02
A study was conducted that investigated the gene ACTN3, which encodes a protein that functions in fast-twitch muscle fibres. People can be classified according to which genotype of this gene they have, RR, RX or XX. The study included a sample of elite sprinters and a sample of endurance athletes. The researchers are investigating whether there is an association between the genotype classification and the type of athlete (sprinters or endurance). What type of hypothesis test would be appropriate for this study? Explain your answer in one or two sentences.
Sickle-cell anemia is a hereditary chronic blood disease that is extremely severe when an individual carries two copies of the defective gene. It is particularly common in countries plagued by malaria, a parasiticinfection transmitted by mosquitoes. A study in Africa tested 543 children for the sickle-cell gene and also for malaria. In Group 1 which consisted of 136 children with the sickle-cell gene, 36 children had severe malariainfections. Group 2 consisted of 407 children without the sickle-cell gene, and 152 of them had severe malaria infections. Conduct a test to determine if the proportion of severe malaria infections among children withthe sickle-cell trait is different from that among children without. Test at 5% level of significance. Question: What is your p value and t statistic ?
Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and surveyed another separate random sample for children with typical development. Table summarizing the number of mothers in each group who did and did not use prenatal vitamins during the three months before pregnancy (data from Schmidt, 2011) Autism Typical Development Total No vitamin 111 70 181 Vitamin 143 159 302 Total 254 229 483 Complete the hypothesis test for independence between the two variables, use of prenatal vitamins during the three months before pregnancy and autism in Rguroo. What is the value of the test statistic for this test? (Use the Large Sample Z method and please round to two decimal places)
The National Health and Nutrition Examination Study (NHANES) had a random sample of 9317 participants recall their diet over the past 24 hours. The information in this sample was used in a recent study that found that, on average, 57.9% of the calories eaten by participants were obtained from ultra-processed foods that include substances not used in culinary preparations, such as flavors, colors, sweeteners, emulsifiers, and other additives. One of the limitations of the study reported by the authors was the dependence on the dietary recall of individuals. The authors were concerned with: (Choose one and explain why in 1-2 sentances) A) response bias B) undercoverage C) overstratification
More than 10% of people carry the parasite Toxoplasma gondii. The life-long presence of Toxoplasma cysts in neural and muscular tissues leads to prolongation of reaction times in infected subjects. The following table gives data from Prague on 15- to 29-year-old drivers who had been and had not been involved in accidents. The table also gives the number of drivers who were infected with Toxoplasma gondii and who were uninfected. Infected Uninfected Drivers with accidents 21 38 Drivers without accidents 38 211 Source: Flegr. J Havlicek, J., Kodym, P. Malý, M. & Smahel, Z. (2002). Increased risk of traffic accidents in subjects with latent toxoplasmosis: a retrospective case- control study. BMC infectious diseasex, 2, 11. https://doi.org/10.1186/1471-2334-2-11 Complete the sentences to form the correct statements identifying the explanatory and response variables. Select from here: infection status. The explanatory variable is place of living. accident state. The response variable is age…
You are conducting a hypothetical retrospective study on use of plastics and prevalence of current medical problems in students. You hypothesize that participants who used more plastic cups in high school will exhibit more medical problems today. You ask all PH1 students to recall how many times they drank out of plastic cups in high school. Your participants struggle to recall this information and end up guessing how often they used plastic drinking containers in high school. Your study design will be negatively impacted by: (select one) A. Misrepresentation B. Recall error C. Negative associations D. Recall bias

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