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If we would like to carry out the test at a significance level (threshold) of 0.05, which of the following is critical value that we need to compare the test statistic to? Use the chi-square distribution linked hereopens a new window.
ANSWER:
This is correct. Indeed, since there are four categories in this problem (the four capacity models 32GB, 64GB, 128GB and 256GB), we need to use row 4 - 1 = 3 in the table. As the image below shows, the critical value that corresponds to a significance level of 0.05 is 7.815.