Posted by **Anonymous** on Saturday, June 5, 2010 at 8:46pm.

the typical

American coffee drinker consumes an average of 3.1 cups per day. A sample of 12 senior citizens reveled

they consumed the following amounts, reported in cups, of coffee yesterday.

3.1 3.3 3.5 2.6 2.6 4.3 4.4 3.8 3.1 4.1 3.1 3.2

At the .05 significance level, does this sample data suggest there is a difference between the national

average and the sample information from senior citizens?

- math -
**PsyDAG**, Sunday, June 6, 2010 at 11:03am
Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

Since only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

## Answer This Question

## Related Questions

- biostatistics - among coffee drinkers, men drink a mean of 3.2 cups per day with...
- Statistics - The international Coffee Association has reported the mean daily ...
- Statistiscs - Students in the psychology department consume an average of 5 cups...
- Statistics: Percentile Rank - A survey of college students was conducted during ...
- statistics - A survey of college students was conducted during final exam week ...
- statistics - In a study of caffeine and stress, college students indicate how ...
- Stats - 1. In a study of caffeine and stress, college students indicate how many...
- Statistics: Calculate a Pearson's r - In a study on caffeine and stress, college...
- statistics - Faculty in the psychology department at APUS consume an average of ...
- stats - A random sample of 40 men drank an average of 20 cups of coffee per week...

More Related Questions