Wednesday

August 20, 2014

August 20, 2014

Posted by **Cam** on Monday, April 15, 2013 at 10:41am.

1. Identify the population mean.

2. Identify the population standard deviation.

3. Suppose a random sample of 15 people over 55 is selected. What is the probability that the sample mean is above 9?

4. Suppose a random sample of 100 people over 55 is selected. What is the probability that the sample mean will be below 7?

- statistics -
**PsyDAG**, Monday, April 15, 2013 at 12:15pmWith your data, these are the best estimates.

1. 8

2. 2

3. Z = (score-mean)/SEm

SEm = SD/√n

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

4. Same process as 3.

**Related Questions**

statistics - A specific study found that the average number of doctor visits per...

Statistics - 1. A study of 40 people found that they could do on the average15 ...

Statistics - A study found that 8-to 12-year olds spend an average of $18.50 per...

statistics - A study found that citizens spend on average $1950 per year on ...

Statistics - Siegel found that elderly people who owned dogs were less likely to...

Statistics - 1. A study of 40 people found that they could do on the average15 ...

statistics - A study of peach trees found that the average number of peaches per...

statistics - An average office worker uses 10000 sheets of paper each year. ...

statistics - If the average number of textbooks is 16, the standard deviation is...

Statistics - I have a problem I need some help on. I have answered parts. Any ...