Collecting Data
What are the 2 types of samples that will allow your inferences to be valid?
Simple Random Sample and Systematic Random Sample
What is the difference between a histogram and a bar graph?
Histograms compare quantitative data while bar graphs compare categorical data.
The value that has 50% of a data set above it and 50% below it.
Median
Calculated by subtracting the lowest value of a data set from the highest value.
range
Which data set has a higher median?
Set A: 12, 5, 8, 7, 11, 3, 21, 17, 44, 2
Set B: 6, 8, 5, , 13, 15, 17, 9, 17, 25, 1
Set B 11 vs Set A 9.5
What are the two types of samples that will cause your inferences to be invalid?
Convenience Sample and Voluntary Response Sample
Which organizational tool clearly displays the total number of data inputs?
two way table
The data value that occurs the most.
mode
IQR or Inter Quartile Range
Which data set has a mean of 11.6?
Set A: 12, 5, 8, 7, 11, 3, 21, 17, 44, 2
Set B: 6, 8, 5, , 13, 15, 17, 9, 17, 25, 1
Set B
For a sample of a population to be representative, each member of the population must have...
an equal chance to be chosen for the sample.
You are surveying students on their favorite type of shoe brand. What are the cases in this survey?
The students
The average of the data values.
mean
The measure of how spread out a data set is.
standard deviation
Which data set has greater variability based off of IQR?
Set A: 12, 5, 8, 7, 11, 3, 21, 17, 44, 2
Set B: 6, 8, 5, , 13, 15, 17, 9, 17, 25, 1
Set A 12 vs Set B 11
In a _______ sample, one or more parts of the population are favored over the others.
biased
Which organizational tool is best associated with the five point summary?
box and whisker
How to describe a data set that is the same on both sides.
Symmetrical
What range of values can correlation be described with?
between -1 and 1
Which data set is skewed left?
Neither...both have a mean that is greater than the median, which means both are skewed right
Which organizational tool can be used for categorical data and requires use of a protractor for accuracy?
Pie Chart
How to describe a data set where the mean is greater than the median.
Skewed right
What does a standard deviation of 0 tell us about a data set?
The data is all the same value.
What is an equation for the line of best fit for this data?
x: 1, 3, 4, 5, 6, 7, 8, 9
y: 5, 10, 15, 12, 17, 24, 20, 25
something close to; y = 2.5x