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According to a recent poll, 29% of adults in a certain area have high levels of cholesterol. They report that such elevated levels "could be financially devastating to the regions healthcare system" and are a major concern to health insurance providers. According to recent studies, cholesterol levels in healthy adults from the area have a mean of 206mg/dL, with a standard deviation of 30mg/dL, and are roughly Normally distributed. If the cholesterol levels of a sample of 50 healthy adults from the region is taken, answer parts (a) through (d).
(a) What is the probability that the mean cholesterol level of the sample will be no more than 206? P(ybar < or equals206)= __(Round to four decimal places as needed.)
(b) What is the probability that the mean cholesterol level of the sample will be between 201 and 211? P(201 < ybar < y bar < 211) = __(Round to four decimal places as needed.)
(c) What is the probability that the mean cholesterol level of the sample will be less than 196? P(ybar<196) = __(Round to four decimal places as needed.)
(d) What is the probability that the mean cholesterol level of the sample will be greater than 218?
a simple random sample of 40 items resulted in a sample mean of 25. the population standard deviation is 5.a. what is
What proportion of observed variation in hardness can be explained by the simple linear regression model relationship between hardness and elapsed time? (Give the answer to three decimal places.)
You would like to take an advantage of the higher yield investment but have only $500 available. What is the maximum rate of return that you would pay to borrow the $200 need to take advantage of the high yield investment?
Round 4 decimal places or give answers in scientific notation if necessary. 1. It is believed to be true that 15% of the U.S. population is left-handed. You randomly select 10 people. Let x represent the number of left-handers.
According to a recent survey, the probability that a passengerfiles a complaint with the Department of Transportation about aparticular U.S. airline is .000014. Suppose 100,000 passengers whoflew with this particular airline are randomly contacted..
The winch cable on a tow truck is subjected to a force of when the cable is directed at. Determine the magnitudes of the total brake frictional force F for the rear set of wheels B and the total normal forces at both front wheels A and both rear w..
Which of the following Venn diagrams has shaded the event that the contractor wins exactly one of the contracts and evaluate the mean time to complete the entire homework assignment
Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems.
A sample mean, sample size, and population standard deviation are given. Use the P-value approach to perform a one-mean z-test about the mean of the population from which the sample was drawn.
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
Suppose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample of100 items is drawn from this population. What is the standard error of the mean?
A male student and a female student from the college are randomly selected for a survey. What is the probability that both are smokers?
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