The weekly earnings of bus drivers are normally distributed with a mean of $395. If only 0.84% of the bus drivers have a weekly income of more than $429.35, the standard deviation of the weekly earnings of the bus drivers is approximately

For the following samples assume they follow a normal distribution and we assume equal variance, we will like to know if there is a difference between both sample means. If we perform a two-sample t-test for independent samples. What is the p-value for the test Statistics?

Sample1 = 9, 11, 10,11,10,12, 9,11,12, 9, 10

Sample2 = 10, 13, 10, 13, 12, 9, 11, 12, 12, 12, 13

What test is used to test the equality of variance