Porcellini et al. (A-8) studied 13 HIV-positive patients who were treated with highly active antiretroviral therapy (HAART) for at least 6 months. The CD4 T cell counts at baseline for the 13 subjects are listed below. \begin{tabular}{lllllll} 230 & 205 & 313 & 207 & 227 & 245 & 173 \\ 58 & 103 & 181 & 105 & 301 & 169 & \end{tabular} Find the followings: (a) The mean (b) The median (c) The mode (d) The range (e) The variance (f) The standard deviation (g) The coefficient of variation
Added by April T.
Close
Step 1
The counts are: 230, 205, 313, 207, 227, 245, 173, 58, 103, 181, 105, 301, 169. ** Show more…
Show all steps
Your feedback will help us improve your experience
Rachel Gore and 70 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Suppose researchers are interested in estimating the prevalence of HIV in a population of adolescent intravenous drug users determined to be equal to 9.4% in the population. In order to estimate the prevalence of the disease, the researchers need to randomly sample from the population of potential participants in their study. Suppose the researchers are able to randomly sample 127 participants and find that 29 are co-infected with the diseases of interest. A) Can we approximate this distribution with the normal? Why or why not? B) Create a Z score for this sample. C) What is the probability of observing the sample that was collected?
Ahmet Y.
Assume a researcher recruits 150 African American and Caucasian individuals taking warfarin to determine if there is a difference in the mean dosage of the medication needed to cause a decrease in their INR blood test. If the mean dosage for 75 Caucasian individuals required to get their INR blood test in range is 6.1 mg with a standard deviation of 1.1 mg and the mean dosage for 75 African American individuals required to get their INR blood test in range is 4.3 mg with a standard deviation of 0.9 mg, the z value obtained while calculating the test statistic is approximately: A. 4.4 B. 1.8 C. 11.0 D. 5.16
Qudsiya A.
Residents have Type B blood: A random sample of 18 Connecticut residents is taken. X = the number of CT residents that have Type B blood. What is the standard deviation of the random variable X?
David N.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Watch the video solution with this free unlock.
EMAIL
PASSWORD