Statistical vs Nonstatistical questions
What is a statistical question?
A statistical question is a question that can be answered by collecting data that varys
What is "mean", and how do you find it?
The mean is the average, and you find it by adding up all the data values and then dividing them by the number of addends
skewed right means...
the graph has a tail (thinner end) to the right
Define categorical data
describes qualities or characteristics. It's often non-numerical or uses numbers as labels. It falls into categories
How do you find the mean, median, and mode on your calculator?
Stat Calc 1:var stats
x = mean
med = median
mode: You're on your own!
Is this a statistical question?
What are the heights of the students in this class?
Yes this is a statiscal question
What is a "median", and what must you know about it?
A median is the middle number, and to find it, the data points must be in numerical order, and if they're are two, add them together and divide by two.
skewed left means...
The graph has a tail (thinner end) to the left
give examples of categorical data
Favorite color, gender, type of phone, zip code, yes/no responses
how do you find mean, median, and mode on statcrunch?
Stat Summary Stats Columns
Select Column
Select statistics (mean, median, mode)
Compute!
Is this a statistical question?
How much time do the members of my family spend eating per year?
Yes, this is a statistical question
What is the "mode" of a data set?
The mode of a data set is the number that appears most often. There can be none or more than one, depending on the data.
symetric means...
The graph is roughly the same on both sides & higher in the middle (bell-shaped)
Define quantitative data
Data that represents counts or measurements. It's numerical, and you can perform mathematical operations on it.
How do you calculate standard deviation in the calculator?
Stat Calc 1:var stats
Range = max - min
IQR = Q3 - Q1
Sample standard deviation = Sx
Population standard deviation = σx
Is this a statistical question?
How much does my dog weigh?
No, this is not a statisitical question
How do you find range?
Highest data point - Lowest data point
The term uniform means...
the graph has no obvious mode (all bars are roughly the same)
Give examples of quantitative data
Height, temperature, number of pets, test scores, and age.
How do you calculate standard deviation on StatCrunch?
Stat Summary Stats Columns
Select Column
Select statistics (Range, Std. dev.)
Compute!
Is this a statistical question?
How many times have I watched Star Wars?
No, this is not a statisitical question
What is a five-number summary
a five-number summary is a description of a data set that includes the minimum, maximum, median, lower quartile, and upper quartile
The term bimodal means...
The graph has two modes (looks like two humps)
Which are used for quantitative data displays?
Bar charts or histograms
Histograms
How do you find a five-number summary in your calculator?
Enter data in Stat -> Edit.
Go to Stat -> Calc.
Select 1:1-Var Stats.
Press Enter (provided your data is in L1). If it is in another list, put that list.
(2nd -> whatever # the list is).
Scroll down.