Mean and Median
What is the average of 2, 4, 5, 10, 14, 16, 19
10
What is the range?
4, 8, 10, 12
8
What does MAD stand for?
Mean Absolute Deviation
The dots on a dot plot represents what?
A data point
Is 'How tall is my teacher?' a statistical or non-statistical question and categorical or numerical?
Non-statistical and numerical
Which measure is the middle value of an ordered data set?
The median
Which measure of spread is found by subtracting the smallest number from the largest?
the range
If a data set has Q1 = 12 and Q3 = 18, what is the IQR?
6
Where is the median shown in a box plot?
The middle line inside the box
Is 'What are the heights of students in our class?' statistical or non-statistical and categorical and numerical?
statistical and numerical
3, 13, 7, 5, 21, 23, 39, 23, 40, 23, 14, 12, 56, 23, 29
What is the median?
23
What does IQR stand for?
Interquartile Range
What does MAD tell us about a data set?
On average, how far each data point is from the mean
Which graph shows data using X’s, dots, or symbols above a number line?
Dot Plot
A statistical question always has what characteristic?
It has answers that vary (more than one possible answer)
5, 7, 8, 10, 100
Which measure of center is MOST affected by the outlier 100?
the mean
A data set has Q1 = 20 and Q3 = 35. What is the IQR?
15
The distances from the mean to each data point are 2, 0, 1, 3. What is the MAD?
1.5
Which type of graph groups data into intervals or 'bins'?
Histogram
Is 'What are the names of each 7th graders sibling?' statistical or non-statistical and categorical or numerical?
statistical and categorical
A set of 7 test scores has a median of 80. What does that mean about the middle score?
the fourth score was an 80
Why is the IQR often better than range to measure variability?
because it looks at the middle 50% of the data and ignores the outliers
Which measure is more affected by outliers: IQR or MAD?
MAD
What is one main difference between a bar graph and a histogram?
Bar graph = categories; Histogram = numerical intervals--- and the bars must touch, to show the data is connected
Rewrite the non-statistical question 'What is my best friend’s shoe size?' into a statistical question.
What are the shoe sizes of 7th graders at our school?