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- Find ∑x. x 0.002 0.017 0.105 0.219 0.411 Question content area bottom Part 1 ∑x= enter your response here (Type an integer or a decimal. Do not round.)Provide answer.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…
- Which of the following is the correct formula for converting a z score to a raw score? Which of the following is the correct formula for converting a z score to a raw score? X=(Z)(SD)+M X=(M)(SD)+Z X=(Z-M)/SD X=(Z-SD)/M X=(M)(Z)+SDWith effect size and power given, what is our n value(# of new enrollees)?Which of the following can increase error in a statistical experiment? (Select all that apply) a. Convenience Sample b. Small sample size c. The sample that has the same characteristics as the population. d. None of these condition will increase error in statistical experiments.
- better same worse Republican 38 104 44 Democrat 12 87 137 none 21 90 118 Express your answers as a decimal and round to the nearest 0.001 (in other words, type 0.123, not 12.3% or 0.123456).If we randomly select one of the adults who participated in this study, compute:P(affiliated with neither party) = P(same) = P(same|affiliated with neither party) = P(affiliated with neither party|same) = P(affiliated with neither party and same) = Submit QuestionQuestion 14Q.1 Dr. Star is interested in whether the physical coordination skills among low-income pre-school children are different from those of other children. She knows the population mean for the Pre- School Coordination Activity Test (PCAT) is 120 with o x= 10. She tests 80 preschoolers from low-income families and obtains an X= 122. a. Should Dr. Star do a one-tailed or a two-tailed test? Explain your answer. b. State the appropriate H o and H a , given your answer in part a. c. Use at a = 0.05. What is the value of zcrit ? d. Calculate z obt e. Using symbols, report your findings. f. What should Dr. Star conclude?Investigators are trying to determine if the contamination of a town well led to significant increases in adverse health effects. During the period of time when water was consumed from this contaminated well, there were 16 birth defects among 414 births. After this well was shut off, there were 3 birth defects among 228 births. You asked to determine if the rate of birth defects was higher when the contaminated well was in use. a. Test the claim that the contaminated well was not associated with a change in the rate of birth defects in the community at the alpha = 0.05 level, by using the two-proportion z test. Confirm your answers using Stata. b. Calculate a 95% confidence interval for the true difference between the proportions of birth defects when the contaminated well was in use versus when the well was shut down. c. Construct the 2x2 contingency table representing the data to Calculate the odds of a birth defect when the contaminated water was consumed and when the well was shut…
- Q2.1 Hypotheses In a clinical trial to compare the effectiveness of two drugs in preventing heart attacks, 25,620 patients were randomly divided into three groups. One group took a tablet of drug A each day. The next group took a table of drug B each day. The third group took one table of each drug each day. Patients were studied for 56 months and the number of who suffered heart attacks (fatal and non-fatal) were counted. Write the appropriate hypotheses to test if there would be an association between these treatments and cardiac outcome. Save Answer Q2.2 Conditions Values in the table represent counts, (expected values), and [Chi-square components] for this study. Drug A Drug B Both drugs Save Answer Is the sample size of 25,620 large enough? Explain how you know. Q2.3 Mechanics Fatal Heart Attack 598 (607.14) [0.1376] 603 (609.56) [0.0706] 620 (604.30) [0.4079] Drug A Drug B Both drugs Values in the table represent counts, (expected values), and [Chi-square components] for this…(er 01-06 Elementary Statistics Ay courses / STAT201-06 Elementary Statistics SP21 | Quizze The median height of a student at a high school 5' 9". Which of the following is a good interpretation of this value? Select one: a. The average height of the students in the school is 5'9". b. 25% of the students' heights are above 5'9". c. 25% of the students' heights are below 5'9". d. 50% of the students' heights are below 5'9".B₁ is an estimator of B₁ a. True O b. False