Test the hypothesis that 1 = 6 in Exercise 7.9 on page 305 against the alternative

Question:

Test the hypothesis that β₁ = 6 in Exercise 7.9 on page 305 against the alternative that β₁ < 6. Use a 0.025 level of significance.

Data From Exercise 7.9

Advertising Costs ($) Sales ($)
40.................................. 385
20.................................. 400
25.................................. 395
20.................................. 365
30.................................. 475
50.................................. 440
40.................................. 490
20.................................. 420
50.................................. 560
40.................................. 525
25.................................. 480
50.................................. 510