Refer to the Journal of Food Engineering (September 2013) study of the characteristics of sweet potato chips fried at different temperatures, Exercise 6.97. Recall that a sample of 6 sweet potato slices were fried at 130° using a vacuum fryer, and the internal oil content (gigagrams [Gg]) was measured for each slice. The results were: x̅ = .178 Gg and s = .011 Gg.

a. Conduct a test of hypothesis to determine if the standard deviation, s, of the population of internal oil contents for sweet potato slices fried at 130° differs from .1. Use α = .05.

b. In Exercise 6.97, you formed a 95% confidence interval for the true standard deviation of the internal oil content distribution for the sweet potato chips. Use this interval to make an inference about whether α = .1. Does the result agree with the test, part a?