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In the U. S. about 15% of the population is 65 years or older (senior citizens). It is estimated that 90% of seniors get a flu shot each year. It is also estimated that 45% of non-seniors get a flu shot. If a U. S. citizen is selected at random:
a) What is the probability they are under 65 years old?
b) What is the probability they are over 65 and did not get a flu shot?
c) What is the probability they got a flu shot?
Suppose we have a population of scores with a mean = 200 and a standard deviation = 10. Assume that the distribution is normal. Provide answers to the following questions:
For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3770. Find value of Z? For some value of Z, the probability that a standard normal variable is below Z is 0.2090. Find value of Z?
Pattern that most accurately represents mean, median and mode is?
Modify (change) your sample size to 18600. Construct a new 95% Confidence Interval.
1.a statistics instructor wants to know which route will get her to school the fastest. each day from october 2 to
The following table presents data on political party affiliation and class level for sample of students in certain university: If the student is selected at random from sample, determine the probability that student is Republican.
On the fictitious game show "Marginal Analysis for Everyone" the host subjects contestants to unusual tests of mental skill. On one, a contestant may choose one of two identical envelopes labeled A and B, each of which contains an unknown amount o..
Suppose you were trying to decide which of two machines to purchase. Furthermore, suppose the length to which the machines cut a particular product part was important. If both machines produced parts that had the same average length, what other co..
Computing from a large sample, one finds the 95% confidence interval for 956; to be {6.8, 14.2}. Based on this information alone, determine the 90% confidence interval for 956
data from a psychology experiment were reported and analyzed in the american statistician may 2001. each student
assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p.
We have administered an anxiety test to all members of the class. The mean anxiety score is 71 and the standard deviation is 9. (higher score=higher anxiety)
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