A random sample of 16 students selected from the student body of a large university had an average age of 25 years. We want to determine if the average age of all the students at the university is significantly different from 24. Assume the distribution of the population of ages is normal with a standard deviation of 2 years. 2. Refer to Exhibit 9-4. At a .05 level of significance, it can be concluded that the mean age is not significantly different from 24 significantly different from 24 significantly less than 25 O significantly less than 24 0/2 points Question 4 Exhibit 9-9 From a population of cans of coffee marked "12 ounces," a sample of 25 cans is selected and the contents of each can are weighed. The sample revealed a mean of 11.8 ounces and a standard deviation of 0.5 ounces. We want to test to determine whether or not the mean weight of all cans is significantly less than 12 ounces. 4. Refer to Exhibit 9-9. If the test is done at a 5% level of significance, it can be concluded that the population mean amount of coffee is significantly less than 12 ounces not significantly less than 12 ounces exactly equal to 12 ounces Not enough information is given to answer this question. Question 5 0/2 points Exhibit 9-6 A random sample of 100 people was taken. Eighty of the people in the sample favored Candidate A. We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 75%. 5. Refer to Exhibit 9-6. At a .05 level of significance, it can be concluded that the proportion of the population in favor of candidate A is significantly greater than 75% not significantly greater than 80% significantly greater than 80% not significantly greater than 75%