A new breathalyser is being trialled. When alcohol is present, the breathalyser correctly predicts alcohol in the system 90% of the time, but gives a false positive (indicates alcohol in the systemwhen the individual has not drunk any alcohol) 4% of the time. On 20th December within the adult population 25% of individual have had alcohol. Given you have had an alcoholic drink what is theprobability the breathalyser does not detect this?0.900.100.040.960.25No answer

Answered: Image /qna-images/answer/a38031fe-6ff1-4b07-b383-aab1ec4d84fd.jpg

Answered: A new breathalyser is being trialled.…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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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…
A professor wanted to study whether there was an association between a person's age and their likelihood to use social media. He surveyed members of Gen Z, Millennials, and Gen X. Below you will find the data that was collected: YES, use social media NO, do not use social media H₂: a=0.05 DF=_ Gen Z 78 11 a. Perform a Chi-Square Test for Association to see if there is evidence to show there is an association between age and likelihood to use social media? Ho: Conclusion: b. Fill in the blanks using your table: X²= Circle one: Millennials 124 19 Number of Gen Z that use social media= Total number of Gen Z surveyed = Gen X 79 24 P-value= Fail to Reject H. OR Reject Ho c. Use your survey results from part b to find a one-sample 95% confidence interval. d. According to an October 2022 study, approximately 93% of Generation Z use social media platforms. Does your confidence interval support or refute this claim?
Pls specify everything all conditions and all step.
Veterinary services among the Springfeild community would like to create an awareness concerning testing cats for kidney diseases following an article that describes cat's illness testing scenerio as follows : among cats , 2% have kidney diseas. Of test done , 82% can detect the disease when its there, 9.6% of the teat detect the disease when its not there the cat has the disease be D and the cat does not have the disease br D' The test turns positive be P and the test is negative be P' using bayes theorem find probability that cat will have the kidney disease given that the test turns out posi
Hypertension It has been found that 26% of men 20 years and older suffer from hypertension (high blood pressure) and 31.5% of women are hypertensive. A random sample of 171 of each gender was selected from recent hospital records, and the following results were obtained. Can you conclude that a higher percentage of women have high blood pressure? Use a = 0.10. Men 44 patients had high blood pressure Women 58 patients had high blood pressure Use p, for the proportion of men with high blood pressure and round all intermediate calculations to at least three decimal places.
Hypertension It has been found that 26% of men 20 years and older suffer from hypertension (high blood pressure) and 31.5% of women are hypertensive. A random sample of 170 of each gender was selected from recent hospital records, E and the following results were obtained. Can you conclude that a higher percentage of women have high blood pressure? Use a=0.01. Men 46 patients had high blood pressure LE Women 61 patients had high blood pressure ale Use P1 for the proportion of men with high blood pressure and round all intermediate calculations to at least three decimal places. Part 1 of 5 (a) This ponesis test etailed Part: 1/5 Part 2 of 5 (b) Find the critical value(s). Round the answer(s) to two decimal places. If there is more than one critical value, separate them with commas. Critical value(s):
Suppose are running a study/poll about the proportion of men over 50 who regularly have their prostate examined. You randomly sample 102 people and find that 87 of them match the condition you are testing. Suppose you are have the following null and alternative hypotheses for a test you are running: Ho:p = 0.86 Ha:p < 0.86 Calculate the test statistic, rounded to 3 decimal places. Z = Question Help: D Video Submit Question hp % & 3 4 7 8 5
University officials hope that changes they have made have improved the retention rate. Last year, a sample of 2049 freshmen showed that 1537 returned as sophomores. This year, 1516 of 1942 freshmen sampled returned as sophomores. Determine if there is sufficient evidence at the 0.05 level to say that the retention rate has improved. Let last year's freshmen be Population 1 and let this year's freshmen be Population 2. Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.
Compute the value of the test statistic and conclude.
Hypertension It has been found that 26% of men 20 years and older suffer from hypertension (high blood pressure) and 31.5% of women are hypertensive. A random sample of 136 of each gender was selected from recent hospital records, and the following results were obtained. Can you conclude that a higher percentage of women have high blood pressure? Use a =0.10. Men 50 patients had high blood pressure Women 63 patients had high blood pressure for the proportion of men with high blood pressure and round all intermediate calculations to at least three decimal places. Use P1
A teacher selects a random sample of 56 students from her large high school. For each student, she records the length of their hair and whether they play a sport. She would like to know if there is convincing evidence that hair length is associated with playing a sport. Let = 0.05. What are the hypotheses for this test? H0: Hair length is not independent of playing a sport.Ha: Hair length is independent of playing a sport. H0: Hair length is independent of playing a sport.Ha: Hair length is not independent of playing a sport. H0: There is an association between hair length and playing a sport.Ha: There is no association between hair length and playing a sport. H0: The proportion of students with differing hair lengths is not the same if they play sports.Ha: The proportion of students with differing hair lengths is the same if they play sport
Hypertension It has been found that 26% of men 20 years and older suffer from hypertension (high blood pressure) and 31.5% of women are hypertensive. A random sample of 170 of each gender was selected from recent hospital records, and the following results were obtained. Can you conclude that a higher percentage of women have high blood pressure? Use a=0.01. Men 46 patients had high blood pressure Women 61 patients had high blood pressure Use P1 for the proportion of men with high blood pressure and round all intermediate calculations to at least three decimal places. Part 1 of 5 (a) State the hypotheses and identify the claim with the correct hypothesis. Ho:P, not claim H : P, < P2 claim This hypothesis test is a one-tailed Part 2 of 5 (b) Find the critical value(s). Round the answer(s) to two decimal places. there is more than one critical value, separate them with commas. Critical value(s):-2.33| Part: 2 / 5 Part 3 of 5 (c) Compute the test value. Round the intermediate calculations…

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