Two Sample t-test data: wght by trt t = 4.1015, df = 20, p-value = 0.0005549 alt

Question

        Two Sample t-test

data: wght by trt

t = 4.1015, df = 20, p-value = 0.0005549

alternative hypothesis: true difference in means is not equal to 0

95 percent confidence interval:

37.09853 113.88814

sample estimates:

mean in group control   mean in group ozone

             460.3833              384.8900

In your own words, write your conclusion regarding the effects ozone on plant growth at the 5% level of significance. Do not just write “reject H0” or “do not reject H0.” compare the value to the alpha of 0.05

Explanation / Answer

As p-value (=0.0005549) is less than level of significance (alpha = 0.05), we have sufficient evidence to reject the null hypothesis at 5% level of significance. In other words, ozone has a signifcant effect on the growth of plants.

Hence, we reject H0.

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