Bivariate Data

Question 1

Regression Line

Answer 1

Will always pass through the mean point (x̄, ȳ)

Question 2

Interpolating

Answer 2

Estimating a value inside the data range (reliable)

Question 3

Extrapolating

Answer 3

Estimating a value outside the data range (unreliable)

Question 4

When the value of ρ is closer to 0 than r (significance level)

Answer 4

• Insufficient evidence (not significant)
• Accept H0
• No correlation

Question 5

When the value of ρ is closer to 1 than r (significance level)

Answer 5

• Sufficient evidence (significant)
• Reject H0
• Positive correlation

Question 6

When the value of ρ is closer to -1 than r (significance level)

Answer 6

• Sufficient evidence (significant)
• Reject H0
• Negative correlation

Question 7

UK Places in Large Data Set (North - South)

Answer 7

Leuchars (E)
Leeming (N)
Heathrow
Hurn (S)
Camborne (SW)

Question 8

Other Places in Large Data Set (North - South)

Answer 8

Beijing, Jacksonville, Perth

Question 9

Months & Years Included in Large Data Set

Answer 9

• May to October
• 1987-2015

Question 10

What are the 11 Large Data set Variables and how are they measured?

Answer 10

1. Daily mean temperature (°C)
2. Daily total rainfall (mm)
3. Daily total sunshine (hours)
4. Daily mean windspeed (knots/ calm, light, moderate, fresh)
5. Daily maximum relative humidity (%)
6. Daily maximum gust (knots)
7. Daily mean wind direction (degrees relative to true north)
8. Daily maximum gust direction (degrees relative to true north)
9. Cloud cover (oktas)
10. Visibility (meters)
11. Pressure (hectopascals hPa)