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A machine produces metal rods used in an automobile suspension system. A random sample of 15 rods is selected,and the diameter is measured. The resulting data (in millimeters) are as follows:
8.248.258.208.238.248.218.268.268.208.258.238.238.198.288.24
(a) Check the assumption of normality for rod diameter.(b) Calculate a 95% two-sided confidence interval on mean rod diameter.(c) Calculate a 95% upper confidence bound on the mean. Compare this bound with the upper bound of the two-sided confidence interval and discuss why they are different.
Is the number of children that a college student currently has independent of the type of college or university being attended?
During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. 80% of the households spent more than what amount?
Can researcher conclude that humidity has significant effect on eating behavior? Use a two-tail test with α = .05. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
Use the Rare Event Rule. Does the evidence support the claim?
The owner of a restaurant has just changed the delivery process in order to reduce the mean time between the order and completion of delivery from the current 25 minutes.
Wall Street securities firms paid out record year-end bonuses of $125,500 per employee for 2005 (Fortune, February 6, 2006). Suppose we would like to take a sample of employees at the Jones & Ryan securities firm to see whether the mean year-end b..
At the end of 24 weeks of treatment, subjects were classified as responders or non-responders to treatment based on a battery of psychological tests.
Find the questions based on multiple regression - The coefficient of determination for the above model is approximately
A researcher testing the affects of music on studying conducts a within participants design. The results are as follows: music 6,7,6,5,6,8,8, and no music 10,7,8,7,7,9,8
The number of lightning strikes in a year at the top of a particular mountain has a Poisson distribution with a mean of 4.2. Find the probability that in a randomly selected year, the number of lightning strikes is 0.
The American Automobile Association checks the prices of gasoline before many holiday weekends.
Which of these variables are discrete and which are continuous random variables?
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