Potato chips The weight of potato chips in a mediumsize bag is stated to be 10 ounces. The amount that the packaging machine puts in these bags is believed to have a Normal model with mean 10.2 ounces and standard deviation 0.12 ounces. a) What fraction of all bags sold are underweight? b) Some of the chips are sold in bargain packs of 3 bags. Whats the probability that none of the 3 is underweight? c) Whats the probability that the mean weight of the 3 bags is below the stated amount? d) Whats the probability that the mean weight of a 24-bag case of potato chips is below 10 ounces?

STAT-5615: Statistics in Research I Lecture 6 Con▯dence Intervals Ott & Longnecker 4.12, 5.2, 5.3, 5.7 Dr. Christian Lucero Virginia Tech Fall 2016 Topics for this Lecture 1. The General Idea Behind Interval Estimation. 2. Student’s t Distribution 3. Con▯dence Intervals for a single mean m when s is known. 4. Con▯dence Intervals for a single mean m when s is unknown. 5. Interpretation of the Con▯dence Interval. 6. Factors that control the width of CIs. Review 1. Sample Variation and Point Estimation 2. Probability and Probability Distributions 3. Random Variables I Understand the di▯erence between the notati