Answer:
Option D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $151 and $216.
Explanation:
A confidence interval is a range of values, derived from the sample statistics, which may include the value of an unknown population parameter.
A 95% confidence interval indicates that between 152 of 160 samples (95%) of the same population will produce confidence intervals that will contain the population parameter.
It also means that we have a 95% confidence that the average (average amount) is among the resulting amounts obtained.
Logically, option "D" is missing the final part. This would be: D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $ 15.
This is the only true option, since the test is based on a sample of only 160 households, the entire population of households cannot be included.
Hence, the correct option is:
Option D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $151 and $216.
Answer:
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Explanation:
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Answer:
b. $28,000 and $12,000 respectively
Explanation:
The marginal cost and marginal revenue refers to the additional cost or revenue that is generated for adding an additional unit or increasing the ouput by one unit,
In thi case, moving to Large reservoir from Medium reservoir
Marginal cost: 72,000 - 44,000 = 28,000
<em>It cost 28,000 to move to a large reservoir</em>
Marginal revenue :64,000 - 52,000 = 12,000
<em>It generates additional benefit for 12,000</em>
A. Occupational Outlook Handbook.
