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Professor Smith wishes to compare the performance of students in her class on multiple-choice and fill-in-the-blank exams. She randomly chooses half the class for each test. If each test has a standard deviation of 10, what is the probability of detecting a true difference of 5 points with a two tailed test, .05, when the sample size is
(a) 10?
(b) 25?
(c) 50?
(d) 100?
About how many should you expect the person to get right under the null hypothesis that the person is guessing?
Learning math. Developers of a new math curriculum called "Accelerated Math" compared performances of students taught by their system with control groups.
Picture bread that is sliced with thickness Xi that is uniform in a given slice i, but varies from slice to slice.
two friends are training for the boston marathon. james is training on a hilly jogging loop. forthe general population
a. Draw a probability tree for this situation, with the most appropriate choice for the first branch. b. Find the probability that it is a good year.
The Bell-Boeing V-22 Osprey Tiltrotor is both an airplane and a helicopter. Its advantage is the ability to rotate its engines to a vertical position, as shown in Figure P7.33 (a), for takeoffs and landings and then switch the engines to a horizon..
An aircraft company is considering using a new light-weight fastener, called the Superlight, to rivet certain sheet metal parts together.
A computer laboratory in a school has 33 computers. Each of the 33 computers has 90% reliability. Allowing for 10% of the computers to be down.
1. Identify and select any health related research topic of your own choice and interest.
If a second-order polynomial model were fitted to the scatterplot of the data, what would be the signs of the partial regression coefficients in the model?
Studying frustration A psychologist wants to study the effects of failure and frustration on the relationships among members of a work team.
Linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level alpha. n = 11, Alpha = 0.01
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