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To determine the proportion of people in your town who are smokers, it has been decided to poll people at one of the following local spots:
The Pool hall
The Bowling alley
The Shopping mall
The Library
Which of these potential polling places would most likely result in a reasonable approximation to the desired proportion? Why...?
To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in.
the accounting department analyzes the variance of the weekly unit costs reported by two production departments. a
What is the probability that both cards dealt are aces or 10-point cards? What is the probability that both of the cards are aces?
a researcher collects data to see if medical insurance type and doctors visits per year are related. he obtains the
1. suppose a 95 confidence interval is computed for u resulting in the interval 112.4 121.6. then it would be accurate
Compute the within group variability. Do you require any post hoc testing? Why or why not? Decribe in detail.
it is desired that the true standard deviation of the softening point of a certain type of petroleum pitch be at most
With a population standard deviation of 15. Use the 95% confidence interval. Approximately how many Kleenexes should go in the automobile glove compartment boxes?
Find a 95% confidence interval for the difference in the proportion of deaths between the streptokinase and the control group.
The distribution of sample means? Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
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
State the decision rule using the .01 significance level. Compute the value of chi-square. What is your decision regarding Ho?
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