QMB 3200 - EXAM 2 QUESTIONS AND ANSWERS

QMB 3200 - EXAM 2 QUESTIONS AND
ANSWERS



the level of significance - Correct Answers -In the hypothesis testing procedure, α is
_____

-1.383 (locate value in t-table, lower tail is correlated to negative) - Correct Answers -
For a one-tailed test (lower tail) with a sample size of 10 and a .10 level of significance
the t value is _____
a. -2.821
b. -1.383
c. -1.372
d. 1.383

b. H0: μ < 0 - Correct Answers -Which of the following hypotheses is not a valid null
hypothesis?
a. H0: μ ≥ 0
b. H0: μ < 0
c. H0: μ = 0
d. H0: μ ≤ 0

c. t - Correct Answers -Independent simple random samples are selected to test the
difference between the means of two populations whose variances are not known. The
sample sizes are n1 = 32 and n2 = 40. The correct distribution to use is the _____
distribution.
a. normal
b. binomial
c. t
d. uniform

a. min Σ(yi - ŷi)2 - Correct Answers -The least squares criterion is _____.
a. min Σ(yi - ŷi)2
b. min (Σyi - ŷi)2
c. min Σ(yi - ȳ)2
d. min Σ(xi - yi)2

c. coefficient of determination - Correct Answers -The proportion of the variation in the
dependent variable y that is explained by the estimated regression equation is
measured by the _____.