Two sample t-Test in R
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In this video you will learn how to carry out a two-sample T-test in R studio.
The Video
will include:
- Brief description of two sample t-Test
- Visualizing the data set
- Performing two-sample t-Test in R studio
If a data set is obtained from two samples and population variance is
not known. For such two sample means, the t-test is more often used. The T-test is
usually applied for a sample size lower than thirty.
Let’s see the example data set.
A researcher grows maize plants in two separate fields. As the plants
are ready to be harvested. He is interested to see the difference in cob
length. He takes a random sample of 6 plants from both fields. He measured the
cob length. The object X one shows the cob length of cobs measured from field
one. The object X two shows the cob length recorded from the second field.
First, formulate the hypothesis.
- Null hypothesis: H0: µ1 = µ2 or µ1 - µ2 = 0
- Alt hypothesis: H1: µ1 ≠ µ2 or µ1 - µ2 ≠ 0
Test the hypothesis at 0.05 level of significance
The null hypothesis shows that there is no difference in the mean cob length of
both fields. Or, the difference in the mean cob length of both fields is
equal to zero. The alternate hypothesis is the opposite of the null hypothesis. It
means the difference in the mean cob length of both fields is not equal to
zero. Let’s test this hypothesis at a 5 percent confidence level.
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