T 42. Old Faithful Old Faithful eruptions do not occur at uniform intervals and may vary greatly. Can we improve our chances of predicting the time of the next eruption if we know how long the previous eruption lasted? d) State a conclusion based on this regression analysis: Dependent variable is Interval R-squared = 77.0% s = 6.159 with 222 – 2 = 220 degre of freedom Variable Coefficient SE(Coeff) t-Ratio P-Value Intercept 33.9668 1.428 23.8 <0.0001 Duration 10.3582 0.3822 27.1 <0.0001 Variable Mean StdDev Duration 3.57613 1.08395 Interval 71.0090 12.7992 e) The second table shows the summary statistics for the two variables. Create a 95% confidence interval for the mean length of time that will elapse following a 2-minute eruption. f) You arrive at Old Faithful just as an eruption ends. Witnesses say it lasted 4 minutes. Create a 95% prediction interval for the length of time you will wait to see the next eruption.

T 42. Old Faithful Old Faithful eruptions do not occur at uniform intervals and may vary greatly. Can we improve our chances of predicting the time of the next eruption if we know how long the previous eruption lasted? d) State a conclusion based on this regression analysis: Dependent variable is Interval R-squared = 77.0% s = 6.159 with 222 – 2 = 220 degre of freedom Variable Coefficient SE(Coeff) t-Ratio P-Value Intercept 33.9668 1.428 23.8 <0.0001 Duration 10.3582 0.3822 27.1 <0.0001 Variable Mean StdDev Duration 3.57613 1.08395 Interval 71.0090 12.7992 e) The second table shows the summary statistics for the two variables. Create a 95% confidence interval for the mean length of time that will elapse following a 2-minute eruption. f) You arrive at Old Faithful just as an eruption ends. Witnesses say it lasted 4 minutes. Create a 95% prediction interval for the length of time you will wait to see the next eruption.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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