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A random sample of STAT200 weekly study times in hours is as follows: 2 14 15 18 20
Find the standard deviation.
Are any of these study times considered unusual in the sense of our textbook? Explain.
Does this differ with your intuition? Explain.
Find the expected frequency to test the claim that walking and low, moderate, and high blood pressure are not related. Round to the nearest tenth if necessary.
In an experiment on a new drug to determine the most effective dosage and method of administration, subjects were randomly assigned to either 5, 10, 15, or 20 mg of the active drug.
when a population mean is compared to to the mean of all possible sample means of size 25 the two means area. equalb.
the machining center at a production facility has three lathes of differing ages and thus precision. the oldest machine
a company has developed a new deluxe aaa battery that is supposed to last longer than its regular aaa battery. however
Using the above database, compute a t-test comparing males' and females' heights. You must determine which type of t-test to compute. Write a short interpretation of the results.
based on interviews with 83 sars patients researchers found the the mean incubation period was 4.3 days with a standard
Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y.
Calculate the mean and the standard error of the sampling distribution of the sample means. Also, find the mean and standard error of the sampling distribution for samples of size 5.
Compute the Relative risk (RR) of ADR with Drug A compared to Drug B. Show all calculation. Interpret the RR value. Do you arrive at the same conclusion based on the OR estimate and RR?
a below are the numbers of deaths from tornados in the u.s. from 1990 through 2000.53 39 39 33 69 30 25 67 130 94
Explain the terms: simple random sampling , systematic sampling, stratified sampling, cluster sampling and what is a time series? Explain the 4 main components of a time series.
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