Posted by **stan** on Wednesday, December 12, 2012 at 3:25am.

5. A professor teaching introductory psychology gave the grades that follow. According to the normal curve, she should have given about 4% A’s, 14% B’s, 64% C’s, 14% D’s, and 4% F’s. Do a Chi-Square to determine if the actual grade assignment significantly departed from the normal distribution. α=.05

A’s B’s C’s D’s F’s

25 35 60 30 20

- statistics -
**PsyDAG**, Wednesday, December 12, 2012 at 11:33am
X^2 = ∑ (O-E)^2/E, where O = observed frequency and E = expected frequency.

∑ = sum of all the cells.

E = (column total * row total)/grand total

df = n - 1, where n = number of cells

Look up value in X^2 table in the back of your textbook.

## Answer this Question

## Related Questions

- college - Suppose that, for a certain exam, a teacher grades on a curve. It is ...
- Business Statistics - In each case, sketch the two speciﬁed normal curves...
- statistics - Percentage grades in a large physics class follow a normal ...
- statistics - A professor is interested in determining whether assigning ...
- Statistics - Exam Grades. A statistics professor is used to having a variance in...
- elementary statistics - A statistics professor is used to having a variance in ...
- elementary statistics - A statistics professor is used to having a variance in ...
- statistics - Last semester, a certain professor gave 23 As out of 279 grades. If...
- English - Which of the following sentences both a direct and indirect object? A...
- Statistics - 1. The mean and standard deviation of the grades of a group of ...