QUIZ 9: Tick the correct answer in following:

1- Test market results of two advertisements of products A and B, yielded the following result:

	A	B
Who saw the advertisements	200	300
Who saw the advertisements and tried the product	40	60

The value of pooled sample proportion (p) is

A	0.60
B	0.30
C	0.20
D	0.25

2- The degree of freedom oft-test for independent samples (where ₁& ₂are unknown and not assumed to be equal) with sample sizes n₁=37 and n₂= 43 is equal to

A	78
B	42
C	79
D	36

3- A sample of 14 cans of Brand I diet soda gave the mean number of calories per can of 23 with a standard deviation of 3 calories. Another sample of 16 cans of Brand II diet soda gave the mean number of calories as 25 per can with a standard deviation of 4 calories. The test statistic of this problem (given that H₀: ₁= ₂) at the 1% significance level is equal to

A	1.56
B	-15.60
C	-1.56
D	15.60

4- Three students took a statistics test before and after coaching, but coaching did not effect the scores of students i.e mean change in scores is zero. Their scores are as follows:

Students	A	B	C
Before	71	88	63
After	70	89	60

The value of t-test statistic for matched pairs is

A	-0.866
B	8.66
C	-8.66
D	0.866