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The daily demand for coke cans in a cafeteria is approximately normally distributed with mean 150 and standard deviation 20. Let X be a RV that represents the demand.
1. P(X ≤ 200) = ?
2. P(X ≥ 180) = ?
3. P(150 ≤ X ≤ 180) = ?
4. How many cans should be stocked so that P(running out of cans) = 0.1?
An experiment involves rolling a fair six-sided die repeatedly. How many times must the die be rolled for a {6} to result at least once with probability greater than or equal to 0.6 ?
How many different passwords can be created?
A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
the weight of the cereal in a box is a random variable with mean 12.15 ounces and standard deviation 0.2 ounce. what
Suppose two American Airlines cross-country flights are randomly selected. Find the exact probability distribution for the sample variance, S2.
Calculate the coefficient of determination, R^2 = 1- ESS/TSS and comment on its value. Estimate this regression by Ordinary Least Squares (OLS) method.
Based on previous research and sound theoretical considerations an experimental psychologist believes that memory of pictures is superior
In looking at your business, when and why would you want to use a one-sample mean test (either z or t) or a two-sample t-test? Create a null and alternate hypothesis for one of these issues. How would you use the results?
If the account earns 10% per year, how much will James have saved at age 65.
The actual tracking weight of a stereo cartridge that is set to track at 3 g on a particular changer can be regarded as a continuous rv X with pdf
someone is interested in studying property tax rates in the united states. he randomly selects 25 homes and looks up
A standard deviation of 12. If the data for both tests are normally distributed, on which test did the student score better relative to the other students in each class?
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