1.Which of following does the term observed frequency refer to?

a) frequencies computed from the null hypothesis
b) frequencies found in the sample data
c) frequencies found in the population being examined
d) frequencies which are hypothesized for population being examined

2. What is the shape of chi-square distribution?

a) positively skewed with all values greater than or equal to zero
b) negatively skewed with all values greater than or equal to zero
c) symmetrical with mean equal to n - 1
d) symmetrical with mean of zero

3. A chi-square test for goodness of fit is employed to test whether or not there are any preferences among 3 brands of cola. If the study employs a sample of n = 60 subjects, then the expected frequency for each category would be?

4. T/F: One advantage of chi-square tests is that they can be employed when the data are measured on nominal scale.

a) true

b) false