Infected with HIV vs Time Infected with HIV vs Time Figure 4.6: Comparison of HIV Infected Population: Actual vs. Simulated Values and Corresponding Relative Error using the Milne-Simpson Method
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The duration of time from first exposure to HIV infection to AIDS diagnosis is called the incubation period. The incubation periods of a random sample of 7 HIV infected individuals is given below (in years): 12.0 10.5 9.5 6.3 13.5 12.5 7.2 a. Calculate the sample mean. b. Calculate the sample median. c. Calculate the sample standard deviation. d. If the number 6.3 above were changed to 1.5, what would happen to the sample mean, median, and standard deviation? State whether each would increase, decrease, or remain the same?
Federico C.
Method 1 Method 2 Method 3 67 61 57 74 66 65 75 69 78 67 56 76 71 59 71 70 61 Use α = 0.05 and test to see whether there is a significant difference in the time required by the three methods. State the null and alternative hypotheses. H0: Median1 = Median2 = Median3 H1: Not all populations of times are identical. Find the value of the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to three decimal places.) p-value = State your conclusion. Reject H0 - There is sufficient evidence to conclude that there is a significant difference in the time required by the three methods. Do not reject H0 - There is not sufficient evidence to conclude that there is a significant difference in the time required by the three methods. Reject H0 - There is not sufficient evidence to conclude that there is a significant difference in the time required by the three methods.
Madhur L.
The duration of time from first exposure to HIV infection to AIDS diagnosis is called the incubation period. The incubation periods of a random sample of 7 HIV infected individuals is given below (in years): 12.0 10.5 13.5 12.5 9.5 6.3 Suppose another random sample of 100 persons is taken from the same population, and added to the sample of 7, for a total sample of 107 HIV infected individuals. How will the sample median of 107 values compare in value to the sample median from the original sample of n=7? a. it will be larger b. it will be smaller c. it will be exactly the same value d. While the two values should be similar, there is no way to predict exactly how the two values will compare
Sri K.
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