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

Stats Chapter 6


standardizing standardize to eliminate units; standardized values can be compared and combined even if the original variables have different units and magnitudes
standardized value a value found by subtracting the mean and dividing by the standard deviation
shifting adding a constant to each data value adds the same constant to the mean, the median, and the quartiles, but does not change the standard deviation or IQR
rescaling multiplying each data value by a constant multiplies both the measures of position (mean, median, and quartiles) and the measures of spread (standard deviation and IQR) by that constant
normal model family of models for unimodal, symmetric distributions
parameter a numerically valued attribute of a model
statistic a value calculated from data to summarize aspects of the data; mean, ybar, standard deviation are all statistics
z-score tells how many standard deviations a value is from the mean; have a mean of 0 and a standard deviation of 1
standard normal model normal model N(mean, sx)
nearly normal condition a distribution is nearly normal if it is unimodal and symmetric
68-95-99.7 rule in a normal model, 68% of the values fall within 1 SX, 95% within 2SX, and 99.7% within 3SX of the mean
normal percentile corresponding to a z-score gives the percentage of values in a standard normal distribution found at that z-score or below
normal probability plot helps assess whether a distribution of a data is approximately normal if the plot is nearly straight
Created by: 697421973