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Testing Hypothesis Claim

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.

I have to choose the Ho and Ha from drop down
What are the Ho and Ha?
The null hypothesis is Ho is ___. The alternative hypothesis Ha is ____

Which hypothesis is the claim?
The Alternative Ha or Null

Find the critical value(s) and identify the rejection region(s)
Critical Value =
Round three decimal places as needed.
Rejection region(s) =

Find Standardized test statistic
t=
Round three decimal places as needed

Decide whether to reject or fail to reject the null hypothesis.
______________ 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.

Solution Preview

See attachment.
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 ...

Solution Summary

The solution examines testing hypothesis claims. The mean annual income in countries A and B are corrected/

$2.19