Lecture 1 Flashcards
How to sort the data
Put the Data in Ascending order
What type of statistic is median and upper and lower quartiles
Descriptive Statistic
What is the median value an indication of?
Indication of location
Definition of the Median
The middle value of a sample when the sample size is ODD
Definition of Lower Quartiles
The number which is quarter of the way up from the smallest to the largest value in the sample
Upper Quartile defintion
The number which is 3/4 the way up from the smallest to largest value in the sample
What is the quartiles an indication of
Indication of spread
Interquartile Range defintion
The range between the upper quartile and lower quartile
What is the median value in a even sample size
The average of the TWO MIDDLE VALUES
What is the range of the sample
An alternative measure of spread and the difference between the MAXIMUM and MINIMUM sample number
Do quartiles work the same way as medians
Yes they work the same way as medians when dealing with odd and even sample sizes
What do the whisker lines represent
Within a given multiple of the height of the box from the top and bottom
How do you plot outlying points on a box plot (points outside the whisker lines)
They are plotted individually
What is the typical width of a boxplot and why do they vary
The typical values are between 1 and 2
And they vary due to different computer packages
What is the population in normal distribution
It has a symmetric population
