Assignment:
A personal director in a particular state claims that the mean annual income is greater in one of the state's counties (county A) than it is in another county (county B). In county A, a random sample 17 residents has a mean annual income of $42,000 and a standard deviation of $8500.
In County B, a random sample of 8 residents has a mean annual income of $38,300 and a standard deviation of $5100. At significance level 0.05.
Assume the population variances are not equal.
Identify the claim and state the Ho and Ha
Which is the correct claim:
(a) The mean annual incomes in counties A and B are equal."
(b) The mean annual income in county A is less than county B."
(c) The mean annual income in county A is greater than in county B."
(d) The mean annual incomes in counties A and B are not equal.
What are the Ho and Ha?
Which hypothesis is the claim?
Find the critical value(s) and identify the rejection region(s)
Critical Value =
Rejection region(s) =
Find Standardized test statistic
Decide whether to reject or fail to reject the null hypothesis.
Interpret the decision in the context or the original claim
At the 5% significance level, ______ enough evidence to support the personnel directors claim.