Identify the null and alternative hypotheses, test statistic, P-value, A simple random sample of25 filtered 100 mm cigarettes is obtained and the tart content of each is measured. The sample has a mean of 19.6 mg and a standard deviation of 3,43mg. Use 0.05 significance level to test the claim that the mean tar content of filtered 100mm cigarettes is less than 21.1 mg