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An experimenter may "wear two hats," that of subject-matter expert and that of statistician. Is our experimenter wearing primarily the first hat, primarily the second, or both about equally when he or she:
(a) Thinks up the problem?
(b) Translates it into a statistical question?
(c) Draws a conclusion that the average performance of experimental and control groups is really different?
(d) Decides that the imposed difference in treatment was responsible for the difference in average performance?
(e) Relates this finding to those of previous studies?
the city of lewisville has 65246 adults of which 33064 are men. a simple random sample of size 1000 is taken of this
A southern state has an unemployment rate of 6%. The state conducts monthly surveys in order to track the unemployment rate. In a recent month, a random sample of 700 people showed that 35 were unemployed.
The recorder has an instantaneous failure rate of 0.0002 failures/hour (constant rate). What is the probability that the system is functioning after 1000 hours? (Show work).
He argues that the regression effort says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
What must be the probability that a randomly chosen young adult has some education beyond high school but does not have a bachelor's degree? What is the probability that a randomly chosen young adult has at least a high school education?
a) What is the probability of getting four hits in a particular game? (Round your answer to 3 decimal places.) b)What is the probability of not getting any hits in a game?
The club can send 4 students and 2 faculty members to a convention. It decides to choose those who will go by random selection.
List 4 variables that you might assess in a research project related to your research area. List one for each type of measurement scale: Nominal, ordinal, interval, and ratio
Three chips are then selected at random and without replacement from II. (a) What is the probability that all three are white?
In evaluating a poll, a larger sample size would be considered more favorably, but what consideration would you consider even more important than the sample size before trusting the validity of the poll?
Let X1 be the smallest and X2 be the largest among the numbers drawn in the sample. Find p(X1, X2).
If a random sample of 100 batteries is selected and tested, is it likely that the average battery in the sample will last less than 24 hours of continuous use?
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