2.5 pts A hospital administrator is interested in whether hospital patients in h

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2.5 pts

A hospital administrator is interested in whether hospital patients in her state prefer to have a television or a radio in their rooms. There are a total of 33 hospitals in the state, each with three floors, for a total of 99 floors.  The administrator decides to sample 30 of these floors.  To reach this goal, the administrator randomly samples 10 hospitals and then selects every floor in those ten hospitals to be in her sample. What sampling method did she use?

A stratified sample

Suppose you want to see if taking a literature course while in prison makes a convict less likely to commit a new crime after he or she is released. To study this, you take the 40 newest prisoners and randomly assign half of them to take a literature course, while the other half will not take the literature course.  This is process is known as:

Sample division

In a study to assess whether aspirin reduces the risk of a pregnant woman developing hypertension, 68 pregnant women volunteered to be a part of a study advertised at a local hospital. 34 of these women were randomly assigned to receive a low dosage of aspirin every day while the other 34 women were randomly assigned to receive a placebo every day.  Of those in the aspirin group, 4 developed hypertension during their pregnancy, compared to 11 of those in the placebo group.  This was a statistically significant difference, and the researchers conclude that aspirin reduces the risk of hypertension.

This study is high in external validity and low in internal validity.

CNN Conducted a quick vote poll of September 19, 1999 to determine “What proportion of Americans think that the Miss America pageant is still relevant today?” The poll was conducted on the internet, and 5581 people responded. Of these, 1192 people (67% of whom lived in the south) voted yes, and 4389 people (48% of whom lived in the south) voted no.  The 5581 people who responded represent a:

Stratified Sample

Explanation / Answer

1) A hospital administrator ---- A cluster sample

2) Suppose you want to see if taking a literature course ---- Randomization

3)

This study is low in external validity and high in internal validity.

4)

Volunteer Response Sample

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