Find the expected value E(X) of the following data. Round your answer to one decimal place. 2 3 4 5 6 P(X= x) 0.2 0.2 0.2 0.1 0.3
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- Consider the following data: - 4 - 3 - 1 P(X = x) 0.2 0.1 0.2 0.1 0.4 Step 4 of 5: Find the value of P(X > -2). Round your answer to one decimal place.Find p-hat and q- hat for the given data, X=280 and n = 580 Round to three decimalsConsider the following days x -4,-3,-2,-1,0 P(x=x) 0.2,0.3,0.1,0.2,0.2 Find the variance, round your answer to one decimal place.
- A certain affects virus 0.4% of the population (in a population of 100,000 people, 400 will be infected with the virus). A test used to detect the virus in a person is positive 87% of the time if the person has the virus (true positive) and it is positive 14% of the time if the person does not have the virus (false positive). Fill in the remainder of the following table and use it to answer the questions below. Infected Not Infected Total Positive Test Negative Test Total 400 99,600 100,000 Round all percents to the nearest tenth of a percent as needed. a) Examine the "Positive Test" row of the table. If a person tests positive for the virus, what is the probability that the person is really infected. (Note: in medical terminology, this probability measures the "positive predictive value" of the test) b) If a person tests negative for the virus, what is the probability that the person really is not infected. (This is called the "negative predictive value")A certain affects virus 0.4% of the population (in a population of 100,000 people, 400 will be infected with the virus). A test used to detect the virus in a person is positive 87% of the time if the person has the virus (true positive) and it is positive 14% of the time if the person does not have the virus (false positive). Fill in the remainder of the following table and use it to answer the questions below. Infected Not Infected Total Positive Test Negative Test Total 400 99,600 100,000Find two z values, one positive and one negative, that are equidistant from the mean so that the areas in the two tails total 4.8%. Use a TI-83 Plus/TI-84 Plus calculator and round the answer to four decimal places, separated by a comma if needed. =z
- Between z= 1.42 and z= 2.17tration 20.28. The mean life of a sample of 10 electric bulbs was found to be 1456 hrs. With S.D.=423 hrs. A second sample of 17 bulbs chosen from a different batch showed a mean life of 1280- hrs with S.D=398 hrs. Is there a significant difference in the means of the two samples