From: <genomenet_at_gmail.com>

Date: Fri, 18 May 2007 11:07:05 -0700

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 18 May 2007 - 18:15:59 GMT

Date: Fri, 18 May 2007 11:07:05 -0700

Hi There,

Using t.test to test hypothesis about which one is greater, A or B? where A={10,20,30},B={25,30,15}.

My question is which of the following conclusions is right?

#################hypothesis testing 1

h0: A greater than or equal to B

h1: A less than B

below is splus code

A=c(10,20,30)

B=c(25,30,15)

t.test(c(10,20,30),c(25,30,15),alternative="less")

output:

p-value=0.3359

because p-value is not less than alpha (0.05), we cannot reject h0.

so A greater than or equal to B.

#################hypothesis testing 2

h0: A less than or equal to B

h1: A greater than B

below is splus code

A=c(10,20,30)

B=c(25,30,15)

t.test(c(10,20,30),c(25,30,15),alternative="greater")

output:

p-value=0.6641

because p-value is not less than alpha (0.05), we cannot reject h0.

so A less than or euqal to B.

#########################################

Thank you very much.

Van

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 18 May 2007 - 18:15:59 GMT

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