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According to medical data, the probability than an adult US citizen has been diagnosed with high blood pressure is 17%. Suppose you randomly select 57 adults and ask if he or she has been diagnosed high blood pressure .
a. Decide whether you can use the normal distribution to approximate the binomial distribution. If so, find the mean and standard deviation. Round to the nearest hundredth when necessary. If not, please explain why a normal distribution should not be used.
b. Find the probability that no more than 10 of the sampled adults have been diagnosed with high blood pressure using an appropriate method
None of those lost to follow-up had developed chicken pox prior to becoming lost. Assume that you can get chicken pox only once. What is the cumulative incidence of chicken pox in this population during the one-year period from January 1st through..
What is the underlying variable that indirectly correlates these 2 variables? What other variables could you identify as having an indirect relationship?
Let A be a nonnegative random variable that is independent of any collection of samples X(t1), . . . , X(tk) of a stationary random process X(t). Is Y(t) = AX(t) a stationary random process?
a. Number of minutes that students spend on the computer on a given day b. Number of minutes that students spend on the phone on a given day
During a bear market, 140 investors were asked how they were adjusting their portfolios to protect themselves. Some of these investors were keeping.
Construct a 95% CI for the proportion of households with family history of heart disease, separately for each race. Would you say the proportion of households with history of heart disease differ by race?
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
Using the data from your own survey (see Exercise 5 of Chapter 2) give 95% and 99% confidence intervals for the population mean and total.
Construct a histogram using the data. Identify the modal interval of the grouped data. Tracking risk (also called tracking error) is the standard deviation of the deviation of a portfolio's gross-of-fees total returns from benchmark return. Calcul..
a) Make a histogram of the number of births. You may be surprised by the shape of the distribution. (Make a stem plot too if you like.)
He is blindfolded and given small bites of English muffin to identify. At each trial, an English muffin with either butter or margarine is randomly chosen.
What is the probability that Company B would charge more than Company A to drill a well - The depths of wells drilled in this area have a normal distribution with a mean of 250 feet and a standard deviation of 40 feet.
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