I have lots of data -21 people with various info on each- I need to compare data for each via gender, age, etc.. but my problem is that I need to do this by using standarad deviations- I have tried numerous sites to figure how to do this- But every site uses charts- I need an example that is similar to my problem-using #'s not charts
For example 9 dogs with all different weights or any other #'s you wish to assign
I just need to know ( in laymans terms) step by step how to calculate it. I need to find the class avg + or - SD, Female avg + or - SD, and Male avg + or - SD
My example in my book just gives the following
n=numer of data values in
x-value of each data point (what is a data point)?
Z=mean
than calcuate the mean
subtract the mean from each x value
square each Z-x value
add all squared values and this is the sum of squares
then n-1

Then I will need to graph this info- I haven't got a clue on how to do this. Can you help?

Solution Summary

Gives step by step instruction to calculate standard deviation.

What is the standarddeviation of the returns on a stock given the following information?
State of Economy Probability Rate of Return if State Occurs
Boom 10% 16%
Normal 60% 11%

Calculate the expected return and standarddeviation of returns for asset A are (See below.)
Possible Outcomes Probability Returns (%)
Pessimistic 0.25 5
Most likely 0.55 10
Optimistic 0.20 13

You own a portfolio that has 35% invested in asset A, and 65% invested in asset B. Asset A's standarddeviation is 12% and asset B's standarddeviation is 18%. The correlation coefficient between the two assets is -0.7. The expected return on the portfolio is 13%. What is the portfolio standarddeviation?
1. 8.5%
2. 9.3%

You put half of your money in a stock that has an expected return of 14% and a standarddeviation of 24%. You put the rest of your money in another stock that has an expected return of 6% and a standarddeviation of 12%. The two stocks have a correlation coefficient of 0.55. The standarddeviation of the resulting portfolio will

From the attached document, I have a table and histogram of men's vs. women's wages. I am supposed to calculate the standarddeviation and confidence interval. Please explain the steps necessary to obtain these figures.

Calculate the StandardDeviation of your data. USING EXCEL.
THESE ARE MY NUMBERS
26 19 21 15 23 22 18 24 16 19
Is this a normal distribution?
What are the implications?
The following items will be assessed in particular:
Your ability to describe a normal distribution as evi