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The average ACT score in Minnesota in 1986 was 19.4. Assuming a standard deviation of 2.0, find (approximate) the probability that the mean of a random sample of 25 scores from Minnesota exceeds 20.0.
A beverage company is trying to ?nd out the distribution of the breaking strength of their glass bottles. Fifty bottles are selected at random and tested for breaking strength, with the following results (in pounds per square inch):
Over many years of administering tests to my statistics students I have found that the overall average of the scores on the first exam that I give each semester is 76.
in the world series of baseball two teams a and b play a sequence of games against each other and the first team that
only 2 of a large population of 100-ohm gold-band resisters have resistance that exceed 105 ohms. what is the
if the correlation between x and y is r 0.00 then sp 0 and the regression equation is y x 0y x mxy 0 mxy 0
What sample size would be needed to obtain an error of +/- 10 square millimeters with 99% confidence?
The quality control director for a clothing manufacturer wants to study the effect of operators and machines on the breaking strength (in pounds) of wool serge material. Is there an interaction between operator and machine?
Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance.
Random sample of 64 lightbulbs indicates a sample mean life of 350 hours. At a 5% level of significance, is the mean life more than 375. Which of the following is your two hypotheses?
Construction of histogram and pie chart for continuous data
Determine the probability that none of the calculators will be defective?
a corporation creates a sinking fund in order to have 980000 to replace some machinery in 9 years. how much should be
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