The federal reserve system publishes data on family income based on its survey of consumer finances. when the head of the household has a college degree, the mean before-tax family income is $ 84,500. suppose that 60% of the before-tax family incomes when the head of the household has a college degree are between $74,700 and $94,300 and that these incomes are normally distributed. what is the standard deviation of before-tax family incomes when the head of the household has a college degree?

The null and alternate hypotheses are: h0: μ1 ≤ μ2 h1: μ1 > μ2 a random sample of 22 items from the first population showed a mean of 113 and a standard deviation of 12. a sample of 16 items for the second population showed a mean of 99 and a standard deviation of 6. use the 0.01 significant level. find the degrees of freedom for unequal variance test. (round down your answer to the nearest whole number.) state the decision rule for 0.010 significance level. (round your answer to 3 decimal places.) compute the value of the test statistic. (round your answer to 3 decimal places.) what is your decision regarding the null hypothesis? use the 0.01 significance level.