One Method of Human Locomotion That Appears to Have No

question 13

Essay

One method of human locomotion that appears to have no function except to expressjoy is skipping, a skill usually learned in early and middle childhood. Each person ina random sample of female students and a random sample of male students at a largemiddle school was asked, "Approximately how long ago did you last spontaneouslyskip?
" The total sample sizes and the numbers who responded "Less than 1 weekago" are given in the table below: a) Construct a 95% confidence interval for the difference in the proportions of malesand the proportion of females at this school who would respond "Less than 1week."b) Referring to your work in part (a), does there appear to be evidence of a differencein the population proportions of males and females at this school who wouldrespond "Less than 1 week?
" Provide appropriate statistical justification for youranswer.

---

Definitions:

Net Operating Income

An accounting term that represents the revenue minus the cost of goods sold and operating expenses, excluding taxes and interest.

Degree Of Operating Leverage

A measure, at a given level of sales, of how a percentage change in sales will affect profits. The degree of operating leverage is computed by dividing contribution margin by net operating income.

Variable Expenses

Costs that vary in direct proportion to changes in an activity level or volume, such as sales commissions.

Sales Increase

The rise in the volume or amount of sales or revenue a company achieves in a specific period compared to a previous period.