Posted by **Anonymous** on Saturday, April 20, 2013 at 3:46pm.

A researcher asks participants to sample tap water and bottled water. out of 40 people, 28 selected bottled water. was the bottled water selected significantly more often? Use two tailed test with a+.05

- Psychological Statistics -
**PsyDAG**, Monday, April 22, 2013 at 9:56am
Use the Chi-square (X^2) method with two cells.

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.

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