Suppose you computed a 95 confidence interval for the difference in mean weight between two species of snakes in a large nature reserve (species 1 species 2), and your interval is 3.6 to 61.6 ounces. What can you conclude?
a. You cannot say, even with 95 confidence that the observed difference in sample means represents a real difference in the population means.
b. Because the interval extends so much further in the positive direction than the negative, the evidence suggests that species 1 weighs more than species 2 on average, but we can't say for sure.
c. If we were willing to use 90 confidence, we could say that the observed difference in the sample means represents a real difference in the population means.
d. All of the above.
Question 2
What does it mean for a confidence interval for the difference of two means to contain zero?
a. You are unable to say there is a difference in the population means.
b. Different samples could give results in either direction; completely above zero, completely below zero, or containing zero.
c. The confidence interval will contain some negative numbers and some positive numbers.
d. All of the above.
Oocyte maturation in certain species of frogs
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
Components of Weight Gain during Pregnancy
Sketch a graph of the function h(x), by hand on the following interval:
A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower ...