The cost in dollars of making x items is given by the function C(x) = 10x + 500. a. The fixed cost is determined when zero items
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Answer:
At 95% confidence level, the difference between the proportion of freshmen using steroids in Illinois and the proportion of seniors using steroids in Illinois is -7.01135×10⁻³ < < 1.237
Step-by-step explanation:
Here we are required to construct the 95% confidence interval of the difference between two proportions
The formula for the confidence interval of the difference between two proportions is as follows;
Where:
n₁ = 1679
n₂ = 1366
at 95% confidence level = 1.96
Plugging in the values, we have;
Which gives;
-7.01135×10⁻³ < < 1.237.
At 95% confidence level, the difference between the proportion of freshmen using steroids in Illinois and the proportion of seniors using steroids in Illinois = -7.01135×10⁻³ < < 1.237.