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Does the use of cell phones lead to a higher incidence of brain cancer? People with brain cancer were matched with people who did not have brain cancer on age, gender, and living environment. Each participant in the study was asked to answer questions about previous life experiences and exposures. Determine whether or not each of the following terms applies to this observational study.
a. prospective
b. retrospective
c. case-control study
5. A study involving ten people wants to compare the effectiveness of two different brands of antihistamines with regard to enhancing sleep. Each person is randomly assigned to take either Antihistamine A or Antihistamine B on the first night. Then each takes the other antihistamine on the following night. With each person, the hours of sleep were recorded for each night. Explain whether each of the following terms applies to this study.
a. observational study
b. randomized experiment
c. carry-over effect (confounding)
d. matched pairs (dependent samples)
e. explanatory variable (What is it?)
f. response variable (What is it?)
In a random sample of 35 trading days, the volume of a particular stock is recorded to determine whether the mean volume of the stock changed from its 2007 value of 35.14 million shares.
A consumer magazine randomly selected 100 new hybrid car dealers from across the country, and created a list of retail prices. They want to know if the price differs from $25,000.
A statistical analysis of 1,000 long-distance calls made from the headquarters of the Bricks and Clicks Computer Corporation indicates that the length of these calls is normally distributed with μ = 240 seconds and σ = 40 seconds.
In a normal distribution curve with mean as 55 and standard deviation as 10 what will be the area on the right side of the curve and how?
A sample of 64 observations is selected from a normal polulation with a population standard deviation of 15. The sample mean is 215. Ho: U>= 220 and H1: U
Can you use the usual algorithms for addition and subtraction without treating zero as a number? Explain.
3 cards are randomly selected without replacement from an ordinary deck of 52 playing cards. Compute the conditional probability that the first card selected is a spade, given that the second and third cards are spades.
A study has been made to compare the nicotine contents of two brands of cigarettes. Ten cigarettes of Brand A have an average nicotine content of 3.1 milligrams with a standard deviation of .5 milligrams
When using dummy variables in a regression equation to model a qualitative or categorical variable, the number of dummy variables should equal to
You are given an annual time series with 40 consecutive values and asked to fit a fifth-order autoregressive model.
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10. The upper and lower control limits, respectively, for an:
Find the 95% confidence interval of the mean score for all golfers if this is a sample of 110 golfers instead of a sample of 93.
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