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A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the SD is $100. (a) What statement can you make about the range $300 to $700? (b) What statement can you make about the range $480 to $520?
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.
Construct a 95% confidence interval for the population mean, assuming a normal distribution?
A brand name has a 60% recognition rate. If the owner of the brand wants to verify that rate by beginning with a small sample of 10 randomly selected consumers, find the probability that exactly 6 of the 10 consumers recognize the brand name.
A simple random sample is to be drawn from a population of 1200. To have 90% confidence that the sampling error in estimating p is no more than 0.03
Give a brief definition and an example of the following: a. Descriptive Statistics b. Inferential Statistics
Suppose that in a population of 10 items, 3 are defective and 7 are not. Suppose that two items are chosen at random for inspection. Let X be the number of defective items inspected. report all probabilities to a minimum of 5 decimal places of acc..
Describe the given data show a seasonal effect using moving average method. Describe the data which show a seasonal effect.
What is the level of measurement for these items related to the newspaper business?
According to TNS Intersearch, 69% of wireless web users use it primarily for receiving and sending e-mail. Suppose that three wireless web users are selected at random. What is the probability that all of them use it primarily for e-mail?
It is the gallons of water processed at a plant, and the amount of lead removed from the water. A. Make a scatterplot to determine what kind of relationship there seems to be between the two variables. Use the percent of lead removed as the respon..
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
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