Question

The following independent samples show the delivery times for two suppliers of raw materials (in days).  A company currently uses Supplier A but will switch to Supplier B if its average delivery time is less than that for Supplier A. (1 point)

Supplier A							Supplier B
10 12	13 13	12 14	14 10	14 8	12 8	10 12	3 6	15 4	7 6	2 4	18 16	20 18	9 4	5 8

t-Test: Two-Sample Assuming Unequal Variances
	Supplier A	Supplier B
Mean	11.57143	9.0625
Variance	4.263736	37.79583
Observations	14	16
Hypoth. Mean Diff.	0
df	19
t Stat	1.536363
P(T<=t) one-tail	0.070468
t Critical one-tail	1.327728
P(T<=t) two-tail	0.140936
t Critical two-tail	1.729131

1. What is the mean delivery time for Supplier A?
2. What is the mean delivery time for Supplier B?
3. What would be the null hypothesis?
4. What would be the alternative hypothesis?
5. Is this a one-tail or two-tail test?
6. What type of hypothesis test was conducted?
7. What is the test-statistic?
8. What is the correct p-value?
9. What is the correct critical value?
10. In context of the problem, at the 0.1 significance level, which supplier would be company choose?

Answer 1