The circumference of a particular species of tree was thought to be different depending on certain geographical factors. an srs of 60 trees is selected in sequoyah national forest, where it is found that = 6 meters with a standard deviation = 3 meters. a second srs of size 40 is independently selected in yellowstone national forest, and it is found that = 4 meters with a standard deviation = 2 meters. let 1 and 2 represent, respectively, the true mean circumferences of this particular species of tree. assume the two-sample t procedures are safe to use.
1. a 95% confidence interval for 1 – 2 is
2.the researcher tests the following hypotheses: h0 : 1 = 2, ha : 1 ≠ 2
the numerical value of the two-sample t statistic is
3.the researcher tests the following hypotheses: h0 : 1 = 2, ha : 1 ≠ 2. the p-vale for the test is
4. the degrees of freedom for these t procedures are closest to
5. the researcher tests the following hypotheses: h0 : 1 = 2, ha : 1 ≠ 2
the 90% confidence interval is 2 ± 0.83 meters. based on this confidence interval,