How would u figure out these problems? What formulas? I am a bit confused. The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Yellowstone National Park) from 1870 to 1987. Let x, be a random variable that represents the timeinterval (in minutes) between Old Faithful eruptions for the years 1948 to 1952. Based on 8820 observations, the sample mean interval was x1 = 62.2 minutes. Let x, be a randomvariable that represents the time interval in minutes between Old Faithful eruptions for the years 1983 to 1987. Based on 25,340 observations, the sample mean time interval was x, =72.4 minutes. Historical data suggest that o1 = 9.47 minutes and o2 = 11.71 minutes. Let u1 be the population mean of x1 and let uz be the population mean of x2.(a) Compute a 95% confidence interval for u, - 42. (Use 2 decimal places.)lower limitupper limit

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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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How would u figure out these problems? What formulas? I am a bit confused.

The U.S. Geological Survey compiled historical data about Old Faithful Geyser (Yellowstone National Park) from 1870 to 1987. Let x, be a random variable that represents the time
interval (in minutes) between Old Faithful eruptions for the years 1948 to 1952. Based on 8820 observations, the sample mean interval was x1 = 62.2 minutes. Let x, be a random
variable that represents the time interval in minutes between Old Faithful eruptions for the years 1983 to 1987. Based on 25,340 observations, the sample mean time interval was x, =
72.4 minutes. Historical data suggest that o1 = 9.47 minutes and o2 = 11.71 minutes. Let u1 be the population mean of x1 and let uz be the population mean of x2.
(a) Compute a 95% confidence interval for u, - 42. (Use 2 decimal places.)
lower limit
upper limit

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$n_{1} = 8820 S a m p l e s i z e o f o l d f a i t h f u l e r u p t i o n f o r t h e y e a r s 1948 t o 1952 n_{2} = 25340 S a m p l e s i z e o f o l d f a i t h f u l e r u p t i o n f o r t h e y e a r s 1983 t o 1987 x_{1} = 62.2 m i n u t e s S a m p l e m e a n o f o l d f a i t h f u l e r u p t i o n f o r t h e y e a r s 1948 t o 1952 x_{2} = 72.4 m i n u t e s S a m p l e m e a n o f o l d f a i t h f u l e r u p t i o n f o r t h e y e a r s 1983 t o 1987 σ_{1} = 9.47 m i n u t e s P o p u l a t i o n s \tan d a r d d e v i a t i o n o f o l d f a i t h f u l e r u p t i o n f o r t h e y e a r s 1948 t o 1952 σ_{2} = 11.71 m i n u t e s P o p u l a t i o n s \tan d a r d d e v i a t i o n o f o l d f a i t h f u l e r u p t i o n f o r t h e y e a r s 1983 t o 1987 α = 0.05 L e v e l o f s i g n i f i c a n c e$

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