5. Use the national proportion to determine the expected frequencies for your sample. Use observed and expected frequencies of girls and boys to calculate the chi-square statistic. Observed Frequencies Expected Frequencies (Based in Punjab on the general population) 0.50 pts Boys Girls 0.50 pts Boys Girls Category Observed Expected (0 -E) (0-E) (0-E (E E Boys Girls 1 point E: 6. What is your decision (reject the null or fail to reject the null)? What does this mean in plain English: is the observed frequency (proportion in Punjab) different from the expected frequency (national proportion)? 1 point (0.5 pt for decision, 0.5 pt explanation) FORMULAS (0 - E)2 Formula for x2 statistic: x2 = [ E (Remember O = observed frequency and E = expected frequency) df for one-way x" statistic: k - 1