To get the average, find the total number of numbers and divide by that number.
For example, the mean of 1,3,4,5 is 3.25, calculated as (1+3+4+5)/4.
ANSWER the median value when numbers are in order.
For example, median values for 1, 3, 6, 8, and 9 are 6 while 45, 56, and 123 are
56, respectively.
mode - ANSWER the most frequently written value.
Example: Mode = 4 for numbers 2, 4, 5, and 6.
range - ANSWER the largest number and subtract the lesser number
Example: 1, 1, 2, 3, 5, 6; range = 6-1 = 5.
Standard deviation, also known as square root variance, is a measure of how
closely points cluster around the mean. Most medical work requires +/- 2
standard deviations to be statistically significant, as displayed on a histogram.
The null hypothesis predicts that there is no relationship between the two
variables.
Rejecting the null hypothesis indicates that the P value is less than or equal to
the significance level.
P-values range from 0 (complete certainty) to 1.0 (total uncertainty), with a
value of less than 0.01 (1%) being suitable for medical statistics.
The correlation coefficient reflects the strength of the association between
variables. The R value equals the regression coefficient. A tight correlation
(closer to 1.0) is desirable.
A scatter plot depicts the ability of one variable to predict another. The "line of
best fit" or "regression" line is depicted on the graph.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller luzlinkuz. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £8.56. You're not tied to anything after your purchase.