variance of 4 marks?
2. Given two random samples of size ny=7 and n=6 from two Independent normal populations,
with X1 = 10.91, x2 = 8.62,51 = 6.34,82 = 6.09, test the hypothesis at 0.01 level of
significance that both population means are equal.
3. Four hundred and ninety two candidates for scientific posts gave particulars of their university
derren and their hobbles. The data are presented concisely in the following contingency table;
Answers
Answer:
2. The two independent samples are simple random samples from two distinct populations.
For the two distinct populations:
if the sample sizes are small, the distributions are important (should be normal)
if the sample sizes are large, the distributions are not important (need not be normal)
3. A contingency table provides a way of portraying data that can facilitate calculating probabilities. The table helps in determining conditional probabilities quite easily. The table displays sample values in relation to two different variables that may be dependent or contingent on one another. Later on, we will use contingency tables again, but in another manner.
The following video shows and example of finding the probability of an event from a table.