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Suppose u, and H, are true mean stopping distances at 50 mph for cars of a certain type equipped with two different types of braking systems. The data follows: m = 9, x = 114.2, s, = 5.01, n = 9, y = 129.7, and s, = 5.36. Calculate a 95% CI for the difference between true average stopping distances for cars equipped with system 1 and cars equipped with system 2. (Round your answers to two decimal places.)

Suppose u, and H, are true mean stopping distances at 50 mph for cars of a certain type equipped with two different types of braking systems. The data follows: m = 9, x = 114.2, s, = 5.01, n = 9, y = 129.7, and s, = 5.36. Calculate a 95% CI for the difference between true average stopping distances for cars equipped with system 1 and cars equipped with system 2. (Round your answers to two decimal places.)

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.1: Measures Of Center
Problem 9PPS
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Got my first answer from Bartleby:

95% confidence interval is 

(xbar−ybar)±tα÷2(s21÷m)+(s22÷n)‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾√xbar-ybar±tα÷2s12÷m+s22÷n

(114.2−129.7)±(1.7396)(5.012÷9)+(5.362÷9)‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾√114.2-129.7±1.73965.012÷9+5.362÷9

(−15.5±4.25)-15.5±4.25

(-19.75 ,-11.25) 

 

Which is not correct, can you do it again? Thanks

Suppose u, and µ, are true mean stopping distances at 50 mph for cars of a certain type equipped with two different types of braking systems. The data follows: m = 9, х %3 114.2, s, = 5.01, n = 9, y = 129.7, and s, 5.36. Calculate a 95% CI for the difference between true average stopping distances for cars equipped with system 1 and cars equipped with system 2. (Round your answers to two decimal places.) In USE SALT ) -20.68 -10.32
Transcribed Image Text:Suppose u, and µ, are true mean stopping distances at 50 mph for cars of a certain type equipped with two different types of braking systems. The data follows: m = 9, х %3 114.2, s, = 5.01, n = 9, y = 129.7, and s, 5.36. Calculate a 95% CI for the difference between true average stopping distances for cars equipped with system 1 and cars equipped with system 2. (Round your answers to two decimal places.) In USE SALT ) -20.68 -10.32
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