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If we ask everyone in a population a question then it is called a _______ .
Census
A population is _____ .
Everyone in the target group
If we ask a subset of the population a question it is a _______ .
Sample
If we find the mean of a subset then we have a __________
Sample Statistic
Students are assigned numbers by a computer. Those numbers are then pulled out of a hat to make a sample. Is this a random sample?
Yes
The mean of all wellspring students heights is an example of ________ .
Population Mean
Pie charts are good for displaying data with a ______ number of categories.
small
What is the best month of the year?
JULY!
Interquartile range is a measure of _________ .
Spread
Median is a measure of ____________ .
Centre
Two samples of students have a different mean. Why is this?
Sampling variability
American students take less time to get to school that students in SA. Why is this?
Population variability.
AS THE SAMPLE SIZE GOES UP. What happens to sample variability ?
it goes down
Find the IQR. 57, 81, 33, 30, 38, 40, 51, 91
10
Find the median: 54, 20, 79, 53, 55, 42, 45, 39, 53, 82, 50
53
Which samples are more reliable?
Larger samples
