91影视

Need to find what type of t statistics.

The test compares two groups of birds.

7 pairs are in the first group and 6 pairs in the second group.

The samples cannot contain paired data, because the sample sizes differ.

Thus the t-statistic is then the two-sample $t$ statistic.

$t=-1.05$

Determine the hypothesis:

$H_0:{渭}_1={渭}_2$

$H_a:{渭}_1鈮�{渭}_2$

Determine the degrees of freedom:

localid="1650516349894" $$\begin{gathered} df=\min \left(n_1-1,n_2-1\right) \\ =\min (7-1,6-1) \\ =5 \end{gathered}$$

The P-value is the probability of obtaining the value of the test statistic, or a value more extreme. The P-value is the number (or interval) in the column title of Table B containing the t-value in the row $df=5$:

localid="1650516387942" $0.30=2脳0.15<P<2脳0.20=0.40$

If the P-value is less than or equal to the significance level, then the null hypothesis is rejected:

$P>0.05鈬�\text{Fail to reject}{H}_0$