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?

## Answer This Question

## Related Questions

- statistics - FBM 124 class consists of 10 male and 12 female students. Two ...
- statistics - 4 Find: a. The z score for each male salary, based on only the male...
- statistics - 2. A teacher wants to investigate whether there is a difference ...
- statistics - 2. A teacher wants to investigate whether there is a difference ...
- Statistics - An instructor hy pothesizes that the mean of the final ex am grades...
- statistics - 4. A college student is interested in whether there is a difference...
- statistics - 4. A college student is interested in whether there is a difference...
- Statistics - A history class is comprised of 5 female and 8 male students. If ...
- statistics: dependent event - A psychology class is comprised of 4 female and 6 ...
- statistics - 1) One hundred clients of a registered tax agent fall into the ...

More Related Questions