AP Statistics
Chapter 34 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 leastsquares
regression model to estimate the time until the next eruption. Show your method
clearly.
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
Population
20
43.3
19
40.7
23
50.4
21
46.5
24
50.2
25
55.8
27
59.1
18
41.3
25
51.4
24
51.9
(a) What sort of regression is the best fit for this data?
Why is it the best fit?
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 Spring '11
 MR.Smith
 Statistics, Least Squares, Regression Analysis, Old Faithful geyser, leastsquares regression model, Duration times Eruptions

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