Question

Scenario 4 A professor at a large university believes that students take an average of 15 credit hours per term. A random sample of 24 students in her class of 250 students reported the following number of credit hours that they were taking: 12 13 14 14 15 15 15 16 16 16 16 16 17 17 17 18 18 18 18 19 19 19 20 21 Questions 17 to 19 pertain to Scenario 4. Question 17 (1 point) Saved To analyze the data, assume the appropriate conditions are met so that the sampling distribution of the mean can be modeled by a student's T-test. How many degrees of freedom (df) would be used in the T-Test? Question 17 options: a) 24 b) 15 c) 23 d) 14 Question 18 (1 point) Saved What P-value would be properly calculated? Question 18 options: a) 1.09 b) .09 c) .099 d) .0009 Question 19 (1 point) Saved Determine the 95% confidence interval for the number of credit hours taken by the students in the professor's class. Question 19 options: a) 12.27 to 14.53 b) 13.79 to 15.88 c) 14.21 to 16.93 d) 15.66 to 17.54

Answer 1

17. Df = n -1 = 24-1 = 23

Option c) 23

18.

t value is 3.58

P value is 0.00079

Option d) 0.0009

19.

Hence we get 16.62 + 0.88 = 17.5 And

16.62 - 0.88 = 15.74

Option d ) 15.66 to 17.54