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Which of the following would best be used to study this: 1) a case-controlled observation; 2) an observation; 3) a double-blind experimental procedure; and 4) and experimental procedure.

In a raffle, 1,000 tickets are sold for $2 each. One ticket will be randomly selected and the winner will receive a laptop computer valued at $1200. What is the expected value if a person buys one ticket?

For a data set obtained from a random sample, n=25 and x=48.25.  It is known that ó=4.8 A. What is the point estimate of µ?  Round to two decimal places. B. What is the margin of error of estimate for part b? Round to two decimal places. C. Make a 95% confidence interval for µ.  What is the lower limit? Round to two decimal places. D. Make a 95% confidence interval for µ.  What is the upper limit?  Round to two decimal places. Determine the sample size (n) for the estimate of µ for the following. A. E=2.3, ó=15.40, confidence […]

A student who didn’t study for the upcoming quiz decides to ‘wing it’ and just guess on the 10 question quiz. Every question has 4 choices (a – d). What is the pobability that his grade on the quiz will be at most 50%? 

When people smoke, the nicotine they absorb is converted to cotinine, which can be measured through blood tests. A random sample of 40 smokers has a mean cotinine level of 172.5 ng/ml. Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level