Electricity consumption by single-family homes in two separate countries
A large public utility company wants to compare the consumption of electricity during the summer season for single-family houses in two counties that it services. For each household sampled, the monthly electric bill is recorded with the following results:
(Note the italicized X below should have a line above it.)
X $115 $98
S $30 $18
n 25 21
Use a level of significance of 0.01 or (99% confidence), and use statistical inference (confidence intervals or tests of hypotheses).
Question:
(a) Is there evidence that the mean monthly bill is higher in County I than in County II?
(b) Estimate the mean difference between the monthly bill of County I and County II.
Attachments
Solution Summary
The solution contains hypothesis testing examples.
$2.19