For the data given in Exercise 6.5-4, use a t test to test H0: = 0

Question:

For the data given in Exercise 6.5-4, use a t test to test H0: β = 0 against H1: β > 0 at the α = 0.025 significance level.
In Exercise 6.5-4
Ledolter and Hogg (see References) note that percent yields from a certain chemical reaction for changing temperature (factor A), reaction time (factor B), and concentration (factor C) are x1 = 79.7, x2 = 74.3, x3 = 76.7, x4 = 70.0, x5 = 84.0, x6 = 81.3, x7 = 87.3, and x8 = 73.7, in standard order with a 23 design.