Week_1_Practice_Problems

# Week_1_Practice_Problems - Week 1 Practice Problems 1. In a...

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Week 1 Practice Problems 1. In a study of bottled drinking water available in Ontario, researchers collected one bottle of each brand from local supermarkets. There were 23 bottles in total. The bottles were opened and the number of bacteria colonies per ml was determined. Then the bottles were re-capped, left for two days and the colony count was repeated On average, there were 38,000 times as many colonies after two days. The researchers concluded that it was not safe to reuse bottled water after it has been opened. Answer the following based on the information given a) A unit is_____________ b) The target population is _______________ c) The response variate is __________________ d) One attribute of interest is _________________ e) The study population is __________________ f) The sample is _________________ g) What would study error be in this case? h) What would sample error be in this case? 2. Suppose we have an initial measurement i x and a second measurement i y on each unit is a sample. Let / ii zy x i = be the proportional increase as in Question 1.

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## This note was uploaded on 03/20/2011 for the course STATISTICS 231 taught by Professor Mckay during the Spring '10 term at Waterloo.

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Week_1_Practice_Problems - Week 1 Practice Problems 1. In a...

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