Busy. Please wait.

Forgot Password?

Don't have an account?  Sign up 

show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the email address associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know (0)
Know (0)
remaining cards (0)
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

STAT 10-05-16

Variables (Test 1)

Test for independence association
Ho (null hypothesis) the two variables are independent (no association)
Ha (alternative hypothesis) the two variables are dependent (association)
Small p-value supports Ha (typically <= 0.05)
Large p-value supports Ho
Expected table contains values we'd expect to see if variables are independent
To get expected counts in the table, for each cell (Row total * Column total) / Table total
Chi-Squared test =CHISQ.TEST(actual range, expected range)
Minitab-->Graph-->Probability distribution plot Picture of distribution
Normal distribution symmetrical bell curve
The normal distribution stays continuous
The normal distribution is always positive
In the normal distribution, the probability of being any one specific value is zero
Calculating probabilities use technology
In the normal distribution, the probability of being in an interval is the area under the curve in that interval
~ is distributed as
N normal
First number in parentheses mean
Second number in parentheses variance
P probability
Calculating probability in minitab Graph-->Probability distribution-->Shaded area-->X-value
Excel random number generator rand()
P(0<x<1) probability x is between 0 and 1
Area of a line 0
Convert variance to standard deviation Variance = square root(standard deviation)
Suppose X~N(3, 16), P(x > 3.5) = 0.4503
Suppose X~N(3, 16), P(x > -2) = 0.8544
Suppose X~N(3, 16), P(-1 < x < 7) = 0.6827
Created by: Spencer Gowey Spencer Gowey