10.2 Means sd Unknown

# 24 m cars and 28 j cars from japan were road tested

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Unformatted text preview: .e., for D0)? Specific Motors of Detroit has developed a new automobile known as the M car. 24 M cars and 28 J cars (from Japan) were road tested to compare mpg performance. The sample statistics are: M Cars Hypothesis Tests n x s J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2 Population Means parameter DM–J = μM – μJ point estimate d x− 2 =1 x standard error s 2 s22 sd = 1 + n n2 1 margin of error interval estimate s 2 s22 1 + n n2 1 tα 2 d ±tα 2 degrees of df = freedom ( s12 n1 22 s2 s22 1 + nn 1 2 + s2 2 n2 ) 2 ( )+ ( ) s1 1 n1 −1 n1 s2 2 1 n2 −1 n2 2 Example Given these samples, what is the point estimate for the difference between the 2 population means (i.e., for D0)? Specific Motors 2 Detroit has d = x1 − x of developed a new automobile = x M car. known as theM − x J 24 M cars and 28 J cars (from Japan) = 29.8 − 27.3 were road tested to compare mpg performance. The sample = 2.5 statistics are: M Cars Hypothesis Tests n x s J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2 Population Means parameter DM–J = μM – μJ point estimate d x− 2 =1 x standard error s 2 s22 sd = 1 + n n2 1 margin of error interval estimate s 2 s22 1 + n n2 1 tα 2 d ±tα 2 degrees of df = freedom ( s12 n1 22 s2 s22 1 + nn 1 2 + s2 2 n2 ) 2 ( )+ ( ) s1 1 n1 −1 n1 s2 2 1 n2 −1 n2 2 Example Given these samples, what is the standard error for the difference between the 2 population means (i.e., for D0)? Specific Motors of Detroit has developed a new automobile known as the M car. 24 M cars and 28 J cars (from Japan) were road tested to compare mpg performance. The sample statistics are: M Cars Hypothesis Tests n x s J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2 Population Means parameter DM–J = μM – μJ point estimate d x −J= 5 =M x 2 . standard error s 2 s22 sd = 1 + n n2 1 margin of error interval estimate s 2 s22 1 + n n2 1 tα 2 d ±tα 2 degrees of df = freedom ( s12 n1 22 s2 s22 1 + nn 1 2 + s2 2 n2 ) 2 ( )+ ( ) s1 1 n1 −1 n1 s2 2 1 n2 −1 n2 2 Example Given these samples, what is the standard error for the difference between the 2 population means (i.e., for D0)? Specific Motors of 2Detroit has s12 automobile developed a new+ s2 sd = known as the M car. 24 M cars n1 n 2 and 28 J cars (from Japan) 2 sM 2 were road=tested + s Jcompare to nM nJ mpg performance. The sample statistics are: 2 .56 2 + 1 .81 2 = 24 M 0 .625 = Cars Hypothesis Tests n x s 28 J Cars 24 28 29.8 27.3 2.56 1.81 Difference Between 2 Population Means parameter DM–J = μM – μJ point estimate d x −J= 5 =M x 2 . standard error s 2 s22 sd = 1 + n n2 1 margin of error interval estimate s 2 s22 1 + n n2 1 tα 2 d ±tα 2 degrees of df = freedom ( s12 n1 22 s2 s22 1 + nn 1 2 + s2 2 n2 ) 2 ( )+ ( ) s1 1 n1 −1 n1 s2 2 1 n2 −1 n2 2 Example Given these samples, what is the margin of error for 90% confidence of the difference between the 2 population means? Specific Motors of Detroit has developed a new automobile known as the M car. 24 M cars a...
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## This document was uploaded on 03/05/2014.

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