homework1-solution - STAT 51100/ 34500 STATISTICS Homework...

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STAT 51100/ 34500 STATISTICS Spring 2011 Homework 1-Solution Q.N. 1) A snack foods packaging company maintains quality control by randomly selecting production and weighing the bags, and then inspecting the contents. The weight of a bag should be 2 lbs. One day they found that the weight of the 10 cases was 20.5 lbs. identify a) the population, (b) the parameter of interest, (c) the sample, and (d) the sample statistic of this study. Solution: Population: All the snack food bags Parameter: The mean weight of ALL snack food bags Sample: The 10 cases of snack food bags Statistic: The mean weight of the snack food bags in the sample (2.05 lbs) Q.N. 2) Let X denote the time in minutes that a vehicle must wait to get through a traffic light at a busy intersection. Below is a sample data. 0.2, 1.5, 2.3, 4.0, 0.5, 1.5, 2.5, 4.1, 0 .7, 1.6, 2.6, 4.5, 1.1, 1.6, 2.9, 5.1, 1.2, 1.7, 2.8, 5.8, 1.2, 1.9, 3.0, 1.4, 1.3, 2.0, 3.1, 1.4, 2.1, 3.0, 1.4, 2.1, 3.7, 1.4, 2.2, 3.7 a) Construct a stem and leaf diagram of this data set
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homework1-solution - STAT 51100/ 34500 STATISTICS Homework...

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