# Chapter 3+4 Answers - AP Statistics Chapter 3-4 Test Review...

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AP Statistics Chapter 3-4 Test Review 1. Geologists collected data on the duration of eruptions of the Old Faithful geyser and the subsequent intervals between eruptions. The scatterplot below is constructed with duration time of the previous eruption as the explanatory variable, and time until the next eruption as the response variable. Several other summary statistics are provided below. Duration times Time between Eruptions r = 0.877 If you have just witnessed an eruption that lasted 4.5 minutes, use a least-squares regression model to estimate the time until the next eruption. Show your method clearly. b = r s y s x = (.877) 12.799 1.084 = 10.35 a = y b x = 71.009 (10.35)(3.576) = 33.997 y = 33.997 + 10.35(4.5) = 80.572 Which is 1 hour, 20 minutes and 34 seconds. 2. A scientist is studying the population of a bacteria after 3 days of growth at various temperatures. The following table shows the population in millions at various Celsius temperatures. Temp

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## This note was uploaded on 05/01/2011 for the course AP CLASSES 101 taught by Professor Mr.smith during the Spring '11 term at Korea Advanced Institute of Science and Technology.

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Chapter 3+4 Answers - AP Statistics Chapter 3-4 Test Review...

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