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A. Fifteen percent of the U.S. population is greater than 65 years of age. If a sample of 100 persons is chosen, what is the probability that fewer than 10 are more than 65 years old?
B. In a sample of size 100 from the U.S. population, what are the mean and standard deviation of the number in the sample who are more than 65 years old?
An industry publication reports that the average movie costs $35 million to make, but a watchdog group concerned with rising ticket prices says that the average cost is $46.8 million. What statistic do you think each group is using? Explain.
Assume that the standard deviation of such student loan debt is $5,684. Thirty percent of these graduating seniors owe more than what amount?
The following data is a subset of data obtained in an experiment to study the relationship between x = soil pH and y = A1 Concentration/EC ("Root Responses of Three Gramineae Species to Soil Acidity in an Oxisol and an Ultisol," Soil Science, 1973..
In a supermarket 20% shoplifters usually get caught, if a random sample of 8 shoplifters is selected. Find the mean and variance of the distribution. What is the probability that 3 will get caught?
Discuss the effects McCarthyism had on efforts in the US to contrast American liberty with Soviet repression.
There are three nursing positions to be filled at Lilly Hospital. Position one is the day nursing supervisor; position two is the night nursing supervisor; and position three is the nursing coordinator position.
Find the probability that a randomly selected employee earns less than $5.43.
Assume that half of the respondents do not currently play a musical instrument. Find the count of players who said that they are likely to begin playing a real musical instrument in the next two years.
Test the assumption that the more experienced consultant has higher satisfaction ratings at the 5% significance level. Show all steps.
What third variable may explain this observed correlation? Explain how that third variable could create the negative correlation.
On the basis of this confidence interval, can we conclude that more than 50% of all students favor more coed dorms? Explain. Can we reject the possibility that the population proportion is .60?
A graphical presentation may accomplish ALL BUT which of the following objectives? Illustrate the amount of variation in the data.
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