Question 1
The screen below shows the 95% confidence interval for
What does the interval suggest about the relationship between
μ1 and
μ2?Question 2
The owners of an industrial plant want to determine which of two types of fuel (gas or electricity) will produce more useful energy at a lower cost. The cost is measured by plant investment per delivered quad ($ invested /quadrillion BTUs). The smaller this number, the less the industrial plant pays for delivered energy. Suppose we wish to determine if there is a difference in the average investment/quad between using electricity and using gas. Our null and alternative hypotheses would be:
◦
H0: (
μe -
μg) = 0 vs.
Ha: (
μe -
μg) ≠ 0
◦
H0: (
μe -
μg) = 0 vs.
Ha: (
μe -
μg) = 0
◦
H0: (
μe -
μg) = 0 vs.
Ha: (
μe -
μg) > 0
◦
H0: (
μe -
μg) = 0 vs.
Ha: (
μe -
μg) < 0
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