Tuesday

March 31, 2015

March 31, 2015

Posted by **natasha** on Friday, November 4, 2011 at 2:29pm.

a. What proportion drinks 2 cups per day or more?

b. What proportion drink no more than 4 cups per day?

c. If the top 5% of coffee drinkers are considered heavy coffee drinkers, what is the minimum number of cups consumed by a heavy coffee drinker? find the 95th percentile.

- biostatistics -
**PsyDAG**, Saturday, November 5, 2011 at 1:50pmZ = (score-mean)/SD

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

For c, work backwards from the Z score for that proportion.

**Answer this Question**

**Related Questions**

statistics - Among coffee drinkers, men drink a mean of 2.8 cups per day with a ...

Statistics: Percentile Rank - A survey of college students was conducted during ...

statistics - A survey of college students was conducted during final exam week ...

statistics - Faculty in the psychology department at APUS consume an average of ...

Statistiscs - Students in the psychology department consume an average of 5 cups...

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 - The international Coffee Association has reported the mean daily ...

Statistics: Calculate a Pearson's r - In a study on caffeine and stress, college...

statistics - The probablility that a person drinks at least five cups of coffee ...