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Numeracy Intermediate November 2020 Unit 1 Q7

WJECIntermediateCurrent spec6 marksScatter Diagrams & Correlation

7.

(a) Rosie recorded the rainfall and the number of hours of sunshine each day last week.
Scatter graph of rainfall (mm) against sunshine (hours) with 7 points
(i) On one day last week, the number of hours of sunshine was low and the rainfall was lower than on any other day.
Which day was it?
Circle your answer. [1]

Saturday    Sunday    Monday    Tuesday    Can’t tell

(ii) Rosie says,

There will be a positive correlation between rainfall
and the number of hours of sunshine next week.

Is Rosie correct?

Yes ☐      No ☐

You must give a reason for your answer. [1]

(b) At 3 p.m. each day last week, Rosie recorded the wind speed and the number of birds feeding in her garden.
Scatter graph of wind speed (mph) against number of birds with 7 points
(i) Was there a correlation between wind speed and the number of birds feeding in Rosie’s garden last week?

Yes ☐      No ☐

You must give a reason for your answer. [1]

(ii) The greatest wind speed at 3 p.m. last week was on Tuesday.
How many birds were feeding in Rosie’s garden at this time? [1]

…………… birds

(iii) On Wednesday last week, the wind speed at 3 p.m. was a quarter of that on Friday.
Complete the following table. [2]
DayWind speed (mph)
Wednesday……………
Friday……………