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A research company has designed three different systems to clean up oil spills. The following table contains the results, measured by how much surface area (in square meters) is cleared in 1 hour. The data were found by testing each method in several trials. Are the three systems equally effective.
Would the null hypothesis be accepted or rejected in this case?
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
Suppose the random variable x is best described by a normal distribution with µ = 24 and σ = 2.7. Find the z-score that corresponds to each of the following x values.
Which distribution should be used to create 80% confidence interval?
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval
Alice and Bob agree to meet at the bus stop between 12 noon and 1pm. They each arrive at a random time in that interval and wait for 5 minutes before leaving, unless they see the other person. What is the probability that they meet each other?
When the effect of a level for one factor depends on which level of the other factor is present, use: Select one:
A soft drink company has recently received customer complaints about its one-liter-sized soft drink products. Customers have been claiming that the one-liter-sized products contain less than one liter of soft drink.
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
Based on this sample, is Moe correct in his assertion? Write up formal commentary of results of your test.
What is the probability that a person who has submitted one entry will win the following?
Senator Hayes is considering a a run for the U.S. presidency, but she is only 35 years of age, which is the minimum required age. While investigating this issue, she finds the ages of past presidents when they were inaugurated
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