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Unformatted text preview: STAT 509 STAT 509 Review Questions The number of pump failures The number of pump failures follows a Poisson distribution with an average of 1 failure every 10 years. What is the probability that the next pump failure will occur in less than 5 years? If 20% of a certain type of light If 20% of a certain type of light bulb burn longer than 7,500 hours and we place 10 of these bulbs in 10 different devices, what is the probability that at least one light bulb is still burning after 7,500 hours? The daily production of a sulfuric acid The daily production of a sulfuric acid process is known to follow a normal distribution with a mean of 400 tons and standard deviation of 225 tons. Find the
probability that today’s production will be between 375 tons and 425 tons. Know how to estimate with a confidence interval or run a hypothesis test on – The mean of a population.
– The variance or standard deviation of a population
– The ratio of variances from two independent populations.
– The difference between means from two independent populations.
– The mean difference between paired observations from dependent populations. Complete the following ANOVA Complete the following ANOVA table:
Source DF SS Model 300 1 Error
Total 200
24 500 MS F P
value ...
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 Spring '10
 Wheatley
 Probability

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