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As an aid for improving students' study habit, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar.
Before 9 12 6 15 3 18 10 13 7After 9 17 9 20 2 21 15 22 6
At, did attending the seminar increase the number of hours the students studied per week?
A sample of 12 homes sold last week in St Paul, Minnesota, is selected. The results are shown below and create a scatterplot. Insert the trendline into the graph and show the regression equation.
Determine the largest village in terms of the population?
If a worker is chosen at random, what is the probability that he or she.Is very improbable to switch jobs. Is somewhat likely or very likely to switch jobs.
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
A teller can process an average of 100 customers per hour, which also can be modeled by a Poisson distribution. If there is one teller on duty, determine:
In the history class the mean score was 76 with standard deviation 3.
Find out annual break-even volume for the Rolling Creek Textile Mill.
A researcher conducts an experiment comparing two treatment conditions and obtains data with 10 scores for each treatment condition.
To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.
Suppose the random variable X is normally distributed with mean =50 and standard deviation =7 calculate P(X).
Recognize and describe potential threats (up to 3) to internal validity.
Z score on comparison distribution for sample score and your conclusion. Suppose that all population are normally distributed.
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