Review Midterm 1.docx

2 Pages
89 Views
Unlock Document

Department
Sociology and Anthropology
Course
SOAN 3120
Professor
Michelle Dumas
Semester
Fall

Description
Review Midterm 1  You will have to know the properties of when to use a bar and pie charts  Understanding why there is an outlier  Know how to find the mean  Subtract the mean from each observation to get the variance  Recognize that skewness in a distributions moves the mean away from the median to toward the long tail  Know the basic properties of the standard deviation  it is always equal or greater than 0, increases as the spread increases from the mean  Know the properties of correlation  negative number the relationship is negative if it is positive it means the relationship is positive  Regression  you are looking at changes in y with x Questions: Suppose the average salary at a certain company was 100,000 and the median salary was 40,000  What do these figures tell you about the shape of the histogram of salaries at this company? o It is skewed to the right because the mean is different than the median, which drives the mean up and away from the data  Which measure of center is more appropriate? o The median What is the smallest standard deviation you can figure? And when would that happen?  0 when everything is exactly the same, can’t be negative because of the squaring  So the lowest it can be is 0 this only happens when there is no deviation (all observations have the exact same value Choose 4 numbers from one to five, with repetitions, to create the largest standard deviation?  1, 1, 5, 5, this has the largest std dev because these numbers are as far as possible from the mean (which is 3) Suppose a Normal distribution data set mean of 10 and st dev of 2  About what percent of the data should lie between 8 and 12? 68%  About what percent of the data should lie above 10? Half because that would be the halfway point which is the mean so 50% If a baby’s weight is at the median, what is their percentile?  Whatever percentile they are in it means tha
More Less

Related notes for SOAN 3120

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit