Statistics
1. Consider your example, “For instance, if we want to
compare student grades of public universities to private universities, we would
look at independent grade samples of public universities and private
universities – yes, or we could create dependent grade samples from the public
versus the private university.
It is not the initial population that determines if the
final samples are dependent or independent. The initial samples can come from
the same population and our final samples be either independent or dependent.
For example, consider the population of realtors a Sample A
is 10 public universities. Sample B is 13 public universities. We have
standardized test ZZZ with 42 questions to give to each school.
Please explain:
a) How do we Test the mean difference in scores for public
versus private universities (as independent samples)
b) How do we test the mean difference in scores for public
versus private universities (as dependent samples?)
2. If we are testing the mean running time on 100 yards of a
group of 10 parents versus the mean running time of a group of 10 of their
children, the samples are independent if we test the mean time of parent group
versus mean time of the children group. What is necessary to make the samples
dependent?
Repeat for the “before, after”, “inches of
rain, tree growth”
3. Consider the survey question:
Do information technology people get the respect they
deserve? Ans: Yes or No.
Examine the question and what are your comments?
4. Now why must a STOH always have a null and an alternative
hypothesis?
