Test the hypothesis that 0 = 10 in Exercise 7.8 on page 305 against the alternative

Test the hypothesis that β₀ = 10 in Exercise 7.8 on page 305 against the alternative that β₀ < 10. Use a 0.05 level of significance.
Data From Exercise 7.8

Placement Test         Course Grade
    50.................................. 53
    35.................................. 41
    35.................................. 61
    40.................................. 56
    55.................................. 68
    65.................................. 36
    35.................................. 11
    60.................................. 70
    90.................................. 79
    35.................................. 59
    90.................................. 54
    80.................................. 91
    60.................................. 48
    60.................................. 71
    60.................................. 71
    40.................................. 47
    55.................................. 53
    50.................................. 68
    65.................................. 57
    50.................................. 79