Ungrouped vs Grouped Data

So today Max taught us about the wonderfulness data groups.

Grouped Data- frequency --- table
Boundaries Class Marks frequencies


so i am not exactly sure what it all means but i do know how to do it on the calculator so thats a good thing!!

Just do it the same way ( on the calculator) but you have two tables and then put L1,L2 and the handy dandy tool does it all for ya..

To clear the lists just press 2nd + 4

Population Standard Deviation

Measure of variability within a data set
*** Range is also a measure of variability****

population standard divination measures how varied the data set is relative to itself...
So i not exactly sure what it all means but i do know how to find it on the calculator and right now that's all that matters !! ha

Variability+Statistical Anaysis

Stats

Median- Middle of #, when ascending or descending. N=12, than median is the mean of the 9th divided 10th values.
Mean- x bar, the sum of all the x values, divided by n capital sigma
Mode-Most frequently occurring ( mode may not exist or data may have multiple modes)

Probability!!!

So i thought it was about time to write something about what we have been learning for the last month or so.. (We had our test on it last week Thursday).
Probability = sample spaces/complementary events/ independent/ dependent events..

5/8 .625 62.5% 5 chances out of 8

Independent/Dependent Events
It helped to think RESET button or DON'T RESET..
Factorial Notation
-permutation- ordering in which order matters
-combination-ordering doesn't matter
Mutually Exclusive and Inclusive Events
- Exclusive evnets have nothing in common.. p(a) + p(b)
-Inclusive events have things in common... p(a) + p(b)-p(a and b)