Test the hypothesis at the 001 level that the distribution o
Solution
State the hypotheses. The first step is to state the null hypothesis and an alternative hypothesis.
H0: The data follow a specified distribution
Ha: The data do not follow the specified distribution.
Step 2) alpha = 0.01
df = k - 1 = 5 - 1 = 4
k = number of levels of the categorical variable
Critical value for alpha = 0.01 and df 4 = 0.297 (From table or calculator)
Step 3) Chi squared value = 2 = [ (Oi - Ei)2 / Ei ]
Oi = Observed frequency
Ei = Expected frequency
2 = [ (0.11 - 5 * 0.11)2 + (0.24 - 5 * 0.24)2 + (0.3 - 5 * 0.3)2 + (0.24 - 5 * 0.24)2 + (0.11 - 5 * 0.11)2 ] / [5 * 0.11 + 5 * 0.24 + 5 * 0.3 + 5* 0.24 + 5 * 0.11]
= 0.7341
Step 4) Since test stat > critical value we reject the null hypothesis
5) We conclude that the data do not follow the specified distribution.
