Marty, a typist, claims that his average typing speed is 72 words per minute. During a practice session, Marty has a sample typing speed mean of 84 words per minute based on 12 trials. At the 5% significance level, does the data provide sufficient evidence to conclude that his mean typing speed is greater than 72 words per minute? Accept or reject the hypothesis given the sample data below. Ho 72 words per minute; Ha > 72 words per minute a = 0.05 (significance level) 2.1 p = 0.018 Select the correct answer below: Do not reject the null hypothesis because 2.1 > 0.05. Do not reject the null hypothesis because the value of z is positive. Reject the null hypothesis because 2.75 > 0.05. Reject the null hypothesis because the p-value 0.018 is less than the significance level a = 0.05.