DrVirgo
Forum Hero
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What is meant by:
-One tailed hypothesis
-Two tailed hypothesis
Can you give me examples please?
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| satyaking
Forum Junior
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Two tailed hypothesis is nothing but non directional hypothesis.The area of rejection of null hypothesis falls at two extremes in Normal distribution curve.2.5% at below the mean and 2.5% above the mean.suppose the mean value of bicarbonate is 24meq/L the values which are far higher(40) falls in the extreme 2.5% of the tail and the the levels far below (10) from fal in the 2.5% 0f the curve below the mean.Hence as there are two tails of rejection in the normal distribution curve it is called two tailed hypothesis.
One tailed hypothesis .The area of rejection falls either abovethe mean or below the mean.suppose the significance of the test/alpha is 0.05 or 5% then that 5% of area in normal distribution falls at one extreme either above or below the mean.for e.g the mean of intelligent qoutient in a class is atleast 100.Hence mean is greater than or equal to 100 is not rejected.The values below the mean.which falls in the extreme 5% are rejected.this is also called as directional hypotheses
these two are alternatives to null hypothesis if null hypothesis is rejected.so one is directional or nondirectional
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| DrVirgo
Forum Hero
Topics: 1085
Posts: 3,476
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One tailed means only one way of disproving it
Two tailed means two ways of disproving it
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| zubr
Forum Junior
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Alternative Hypothesis = H1
Null Hypothesis = H0
1) H1: A=B
H0: A > B or A < B
2) H1: A not equal B
H0: A=B
3) H1: A < B
H0: A=B or A>B
4) H1: A>B
H0: A=B or A < B
5) H1: A not less B
H0: A < B
6) H1: A not more B
H0: A > B
Q: One-tailed OR Two-taild Hypoteses
What is what? and why?
Edited by zubr on 06/21/06 - 01:58 PM
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| zubr
Forum Junior
Topics: 14
Posts: 61
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When we are talking about One-tailed OR Two-taild Hypoteses,
are we talking about Alternative Hypothesis = H1 OR
Null Hypothesis = H0 ??
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