Year 9 Science – Data Science 1
Practise judging digital footprints, choosing and analysing models, and calculating and comparing means and ranges across groups. 20 questions. 25 minutes.
Tegan deletes an embarrassing post from her social media account. Which statement about her digital footprint is most accurate?
A hospital team of a scientist, a statistician and a computer programmer builds a system to forecast flu outbreaks. Why is this described as data science rather than a single subject?
A student wants to find out whether warmer water makes sea snails move faster. Which question can best be investigated with data?
Choose the word or phrase that completes each blank.
A fitness app records a user's location every day. This data can be 1 by other companies, so the user should check the app's 2 settings.
Blank 1: deleted automatically · collected and sold · hidden permanently
Blank 2: notification · language · privacy
Astronomers want to predict whether a newly found asteroid will pass close to Earth. Which data are most useful for building the model of its path?
Circle 1 word in the sentence below.
Click the word that names the variable the scientists changed in the simulation.
Scientistsraisedtherainfallinapopulationmodelandrecordedthechangeinrabbitnumbers.
Which observation is used as evidence for the Big Bang model rather than the steady-state model?
Choose the word or phrase that completes each blank.
The Big Bang model is accepted over steady-state because galaxies are 1 and cosmic background radiation is 2.
Blank 1: moving apart · moving closer · staying still
Blank 2: only found near Earth · absent · detected in all directions
Choose the word or phrase that completes each blank.
A simulation lets scientists change wind speed and see the effect on a bushfire without 1. If the data entered are poor, the predictions will be 2.
Blank 1: collecting any data · risking real fires · using any equations
Blank 2: unreliable · more certain · exact
A council wants to predict how floodwater would spread across a suburb for different amounts of rain. Which type of model is most suitable?
Choose the phrase that completes the blank.
A student builds a pump-and-tubes model to explain how the heart moves blood. Like every model, it 1.
Blank 1: has no limitations · is exactly like a real heart · is simpler than a real heart
Circle 2 words in the sentence below.
Click the two words that make this conclusion too strong.
Thedataprovethatfertiliseralwaysmakesplantstaller.
A student predicts that heavier trolleys take longer to roll down a ramp. What can be concluded from the data?
| Trolley mass (g) | Time to reach the bottom (s) |
|---|---|
| 100 | 2.0 |
| 200 | 2.1 |
| 300 | 2.0 |
| 400 | 2.1 |
Choose the number that completes the blank.
Day: 0, 2, 4 | Plant height (cm): 10, 13, 16. If the trend continues, the height on day 10 will be 1 cm.
Blank 1: 25 · 40 · 28
A population simulation was run three times. What number of rabbits does it predict after 5 years if the starting number of foxes is 50?
| Starting foxes | Rabbits after 5 years |
|---|---|
| 20 | 400 |
| 40 | 250 |
| 60 | 100 |
Circle 1 word in the sentence below.
A student found the mean of 4, 6, 8 and 22 and got 22. Click the word in her explanation that shows her mistake.
Ipickedthebiggestvalueasthemean.
Two groups timed a toy car. What is the difference between the two group means?
| Group | Times (s) |
|---|---|
| X | 14, 18, 22 |
| Y | 15, 20, 25, 30 |
Choose the number that completes each blank.
Group A recorded 20, 22, 24 s and group B recorded 15, 22, 29 s. Both groups have a mean of 1 s, but group B's range is 2 s.
Blank 1: 21 · 22 · 24
Blank 2: 7 · 14 · 29
The true distance a ruler falls is 15 cm. Two groups measured it three times. Which statement is correct?
| Group | Trial 1 | Trial 2 | Trial 3 |
|---|---|---|---|
| P | 9 | 9 | 10 |
| Q | 11 | 15 | 19 |
Group A ran 3 trials with a mean of 10 s. Group B ran 5 trials with a mean of 12 s. What is the mean of all 8 trials combined?