Referenced from lesson Randomness and Sample Size (Spring, 2021)
1 Evaluate the big-animals-table
in the Interactions Area. This is the complete population of animals from the shelter! Below is a true statement about that population:
The population is 47.7% fixed and 52.3% unfixed.
Type each of the following lines into the Interactions Area and hit “Enter".
random-rows(big-animals-table, 10)
random-rows(big-animals-table, 40)
2 What do you get?
3 What is the contract for random-rows
?
4 What does the random-rows
function do?
5 In the Definitions Area, define small-sample
and large-sample
to be these two random samples.
6 Make a pie-chart
for the animals in each sample, showing percentages of fixed and unfixed.
-
The percentage of fixed animals in the entire populations is 47.7%.
-
The percentage of fixed animals in
small-sample
is . -
The percentage of fixed animals in
large-sample
is .
7 Make a pie-chart
for the animals in each sample, showing percentages for each species.
-
The percentage of tarantulas in the entire population is roughly 5%.
-
The percentage of tarantulas in
small-sample
is . -
The percentage of tarantulas in
large-sample
is .
8 Click "Run" to direct the computer to generate a different set of random samples of these sizes. Make a new pie-chart
for each sample, showing percentages for each species.
-
The percentage of tarantulas in the entire population is roughly 5%.
-
The percentage of tarantulas in
small-sample
is . -
The percentage of tarantulas in
large-sample
is .
9 Which repeated sample gave us a more accurate inference about the whole population? Why?
These materials were developed partly through support of the National Science Foundation,
(awards 1042210, 1535276, 1648684, and 1738598).
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