Posted by Susan on Sunday, December 2, 2012 at 1:13pm.
You are wondering whether male or female students pay more for books and materials at the U of C. You find 5 male friends at the U of C and find that they spent an average of $680 with a standard deviation of $5. You find 4 female friends at the U of C and find that they spent an average of $690 with a standard deviation of $7. Is there a statistically significant difference in the average amount spent between the male and female friends (at α = .05)?

Statistics  PsyDAG, Tuesday, December 4, 2012 at 2:19pm
Z = (mean1  mean2)/standard error (SE) of difference between means
SEdiff = √(SEmean1^2 + SEmean2^2)
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to your Z score.

Statistics  rashida, Saturday, December 8, 2012 at 1:39am
Imagine that the probability of answering this question correctly is only p = .4, and on tests in which it is used, only 8 people attempt it. On what proportion of such tests will fewer than 3 people answer the question correctly?
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