A medical statistician wanted to examine the relationship between the amount of sunshine (x) and incidence of skin discolorations (y). As an experiment he found the number of skin discolorations detected per 100,000 of population and the average daily sunshine in eight counties around the country. These data are shown below.
Predict with 95% confidence the skin discolorations per 100,000 in a county with a daily average of 6.5 hours of sunshine.
Definitions:
Break-even Point
The level of production or sales at which total revenues equal total expenses, with no net loss or gain.
Total Sales Revenue
The overall income generated from selling goods or services before any expenses are subtracted.
Operating Leverage
A measure of how revenue growth translates into growth in operating income, indicating the proportion of fixed versus variable costs a company has.
Margin of Safety
This measures the difference between actual sales and sales at the break-even point, indicating the amount by which sales can drop before losses start occurring.
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