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A champion archer can generally hit the bull s-eye 80% of the time. Suppose she shoots 200 arrows during competition. Let represent the percentage of bull s-eyes she gets (the sample proportion).
a) What are the mean and standard deviation of the sampling distribution model for?
b) Is a Normal model appropriate here? Explain.
c) Sketch the sampling model, using the 68 95 99.7 Rule.
d) What's the probability that she gets at least 85% bull s-eyes?
A US consumer lobby wishes to develop a model to predict gasoline usage, as measured by miles per gallon, based on the weight of the car in pounds. The Excel data file contains data on this for fifty recent models.
in testing the difference between two population means which of the following assumptions is not true for the
suppose that in the setting of the previous exercise you are willing to settle for a margin of error of $1000. will the required sample size be larger or smaller?
while driving a truck over a rugged terrain test track it is found that 8 of the trucks will experience a flat tire
For the data, F=0.46 and the P-value equals 0.63. What can you conclude? d. What were the assumptions on which ANOVA was based? Which assumption is the most important?
1. the regression line y -3 2.5 x has been fitted to the data points 28 60 20 50 10 18 and 25 55. the sum of the
Allen Machines specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. Allen Machines is contemplating the construction of a machine that would harvest weeds on narrow rivers and waterways.
What is meant by a probability distribution? Discuss how you could use one of the text probability distribution at your workplace to help solve a business problem.
Identify at least one example of probability encountered in everyday life which has not previously been mentioned.
A random sample of 100 students who took a statistics exam were asked their score on the exam. The mean score on the test was 50; the standard deviation was 10. The scores are normally distributed.
one measure of the risk or volatility of an individual stock is the standard deviation of the total return capital
According to an early CDC study of 21 patients infected with the swine flu, the average incubation period was 7 days with a sample standard deviation of 4.5 days.
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