For its music 360 survey, nielsen co. asked teenagers how they listened to music in the past 12 months. nearly two-thirds of u. s. teenagers under the age of 18 say they use google inc.'s video-sharing site to listen to music and 35% of the teenagers said they use pandora media inc.'s custom online radio service (the wall street journal, august 14, 2012). sup- pose 10 teenagers are selected randomly to be interviewed about how they listen to music. is randomly selecting 10 teenagers and asking whether or not they use pandora media what is the probability that none of the 10 teenagers uses pandora media inc.'s online what is the probability that 4 of the 10 teenagers use pandora media inc.'s online what is the probability that at least 2 of the 10 teenagers use pandora media inc.'s a. 2 inc.'s online service a binomial experiment? radio service? radio service? online radio service? b. c. d.

Overproduction of uric acid in the body can be an indication of cell breakdown. this may be an advance indication of illness such as gout, leukemia, or lymphoma.† over a period of months, an adult male patient has taken nine blood tests for uric acid. the mean concentration was x = 5.35 mg/dl. the distribution of uric acid in healthy adult males can be assumed to be normal, with σ = 1.87 mg/dl. (a) find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. what is the margin of error? (round your answers to two decimal places.) lower limit upper limit margin of error (b) what conditions are necessary for your calculations? (select all that apply.) σ is unknown n is large σ is known normal distribution of uric acid uniform distribution of uric acid (c) interpret your results in the context of this problem. there is not enough information to make an interpretation. the probability that this interval contains the true average uric acid level for this patient is 0.05. the probability that this interval contains the true average uric acid level for this patient is 0.95. there is a 95% chance that the confidence interval is one of the intervals containing the population average uric acid level for this patient. there is a 5% chance that the confidence interval is one of the intervals containing the population average uric acid level for this patient. (d) find the sample size necessary for a 95% confidence level with maximal margin of error e = 1.10 for the mean concentration of uric acid in this patient's blood. (round your answer up to the nearest whole number.) blood tests