The association between exposure to lead-based paint and developmental disabilities in children is studied, and the following information is recorded for each child in the study:

• Race (black or white)
• Age (in years)
• Amount of exposure (rated from 0 for no exposure to 3 for more than 3 years of exposure).

Which of the following choices lists these variables in order of nominal, ordinal, and interval/continuous?

options:

Amount of exposure, race, age

Age, race, amount of exposure

Race, amount of exposure, age

None of the above

The following are survival times (in months) recorded for six tumor-bearing rats being observed after radiation therapy:

• 1.4
• 1.7
• 2.3
• 2.5
• 3.2
• 3.8

If the observed value of 3.8 months is mistakenly recorded as 38 months, what will be the effect on statistics for this study?

options:

An increase in the median

An increase in the mode

An increase in the mean

An increase in both the median and the mean

An increase in the median, the mode, and the mean

The following data represent the length of hospitalization (in weeks) for five patients with total hip replacement who receive no physical therapy during their stay:

• 4
• 4
• 3
• 5
• 4
• 20

options:

Mean

Variance

Mode

Median

Standard deviation