Question 1
A poll was taken this year asking college students if they considered themselves overweight. A similar poll was taken five years ago. Results are summarized below. Has the proportion increased significantly? Let α = 0.05.
| | Sample Size | Number Considered Themselves Overweight |
| Present Sample | 300 | 150 |
| Previous sample | 275 | 121 |
Question 2
A sample of 150 individuals (males and females) was surveyed, and the individuals were asked to indicate their yearly incomes. Their incomes were categorized as follows.
| Category 1 | $20,000 | up to | $40,000 |
| Category 2 | $40,000 | up to | $60,000 |
| Category 3 | $60,000 | up to | $80,000 |
The results of the survey are shown below.
Income Category | Male | Female |
Category 1 | 10 | 30 |
Category 2 | 35 | 15 |
Category 3 | 15 | 45 |
We want to determine if yearly income is independent of gender.
| a. | Compute the test statistic. |
| b. | Using the p-value approach, test to determine if yearly income is independent of gender. |
Cotton Pygmy Goose - Females resting with a Whiskered Tern near Hodal
Nurse examining and measuring hematuria sample from client with a UTI
Risk-taking behavior by young males.
A sample flow sheet.
Sample of Enzymes
Sample prescription for chlorhexidine.