The paint used to make lines on roads must reflect enough light to be clearly visible at night. Let m denote the true average reflectometer reading for a new type of paint under consideration. A test of versus will Ha H0: m 5 20 : m . 20 df 5 40, t 5 24.8 df 5 5, t 5 5.0 df 5 19, t 5 2.4 df 5 15, t 5 21.6 df 5 11, t 5 22.4 df 5 8, t 5 2.0 be based on a random sample of size n from a normal population distribution. What conclusion is appropriate in each of the following situations?
a.
b.
c.