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Include: all hypothesis tests with all four steps all Confidence Intervals with all output as well as the CI...

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Statistics

Include:

all hypothesis tests with all foursteps

all Confidence Intervals with all output as well asthe CI itself'

all calculator functions used

An experiment was done to see whether open-book tests make adifference. A calculus class of 48 students agreed to be randomlyassigned by the draw of cards to take a quiz either by open-notesor closed-notes. The quiz consisted of 30 integration problems ofvarying difficulty. Students were to do as many as possible in 30minutes. The 24 students taking the exam closed-notes got anaverage of 15 problems correct with a standard deviation of 2.5.The open-notes crowd got an average of 12.5 correct with a standarddeviation of 3.5. Assume that the populations are approximatelynormal. At the 5% significance level, does this data suggest thatdifferences exist in the mean scores between the two methods?

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