# Hypothesis Test

• October 4th 2010, 04:38 PM
Apprentice123
Hypothesis Test
It is assumed that the life of the bulbs is normally distributed test the null hypothesis that the samples were obtained from populations with equal variance, considering $\alpha = 10$%, considering the following information:
$n_1 = 10$ $n_2=8$
$S_1 = 200$ $S_2=62500$
• October 4th 2010, 05:39 PM
pickslides
You need to test that there is no difference in mean bulb life between the 2 populations

$H_0: \mu_1 = \mu_2$

$H_a: \mu_1 \neq \mu_2$

Now use a t-test for difference in means.

Are you firmiliar with this test?
• October 5th 2010, 06:14 AM
Apprentice123
Quote:

Originally Posted by pickslides
You need to test that there is no difference in mean bulb life between the 2 populations

$H_0: \mu_1 = \mu_2$

$H_a: \mu_1 \neq \mu_2$

Now use a t-test for difference in means.

Are you firmiliar with this test?

Yes. Thank you
• October 5th 2010, 06:29 AM
CaptainBlack
Quote:

Originally Posted by Apprentice123
It is assumed that the life of the bulbs is normally distributed test the null hypothesis that the samples were obtained from populations with equal variance, considering $\alpha = 10$%, considering the following information:
$n_1 = 10$ $n_2=8$
$S_1 = 200$ $S_2=62500$

You are testing the variances for equality so you should use the variance ratio or F-test.

CB