Week 2 Flashcards
What term refers to the middle of a population or sample?
A central tendency (remember the line with a chicken tender, its in the middle and the three different mean, median and mode under it)
What is U, Md, Mo?
Mean, median and mode
How does Mean, median and mode work/ how is it calculated?
The mean is calculated by adding all of the observations and dividing by the number of total observations.
The median is picked by looking at observation, if the number of observations is odd, the middle observation, however if even you pick the two in the middle and divide by two for your average between those two observations.
The mode is calculated by looking at which observation is most persistent/ appears the most such as for example 56, 65, 43, 56, 43 here you would pick 56 as it appears twice, however multiple can appear like 56, 56, 65, 65, 34.
How would percentiles work? For example, Dylan scored in top 90% during race day?
It means that Dylan raced and tracked faster than 90% of other racers, however 10% tracked faster than Dylan.
How does a Quartile work?
Q1 - 25%
Q2- 50%
and so forth
How would you calculate range?
Max-Min= your range
What is Variance and how would it be calculated?
Variance is when the mean value (add all observations and divide by total number of observations) is squared
What is a standard deviation/ How would I achieve getting this numeber?
To get a standard deviation you simply square your answer which you got from your variance, and we know that variance is found by squaring your answer from you mean value (not your median or mode value)
How might a few way being for you to present Qualitative data?
Using a bar graph and pie chart remember Qualitative data is categorical.
How might you present Quantitative data?
By using a histogram (Does not really show qualitative data as its a bar chart with highest number and bars can overlap)
