(Choose 1 answer)
(See picture)
A. (iv)
B. (iii)
C. (i)
D. (ii)
The use of preservatives by food processors has become a controversial issue. Suppose two preservatives are extensively tested and determined safe for use in meats. A processor wants to compare the preservatives for their effects on retarding spoilage. Suppose 15 cuts of fresh meat are treated with preservative I and 15 are treated with preservative II, and the number of hours until spoilage begins is recorded for each of the 30 cuts of meat. The results are summarized in the table below.
Preservative I
Preservative II
X1=96.54 hours
X1=106.4 hours
S110.3 hours
S'13.4 hours
State the null and alternative hypotheses for testing if the population variances differ for preservatives I and II.
(ⅰ) Ηο: σ-ση ≥ 0 versus H₁: σ-ση < 0
(ii) Ηο: σ-ση ≤ 0 versus H₁: στ-ση > 0
(iii) Ηο: σε-ση = 0 versus H₁: σι-ση ≠ 0
Q: 41
