A marine biologist measured the dissolved oxygen level, $d$ mg/L, at various depths, $h$ meters, in a specific estuary. Data from a random sample of 10 locations are summarized as follows:

\sum h = 155 \quad \sum h^2 = 2875 \quad \sum d = 62.4 \quad S_{dd} = 18.2 \quad \sum hd = 884.2

Calculate the values of $S_{hh}$ and $S_{hd}$ .

Calculate, to 3 significant figures, the product moment correlation coefficient between $h$ and $d$ .

The biologist also measured the water temperature, $t$ °C, at the same 10 locations. The product moment correlation coefficient between $h$ and $t$ was found to be $- 0.915$ .

Describe, giving a reason, the nature of the correlation you would expect to find between temperature ( $t$ ) and dissolved oxygen ( $d$ ).

A marine biologist measured the dissolved oxygen level, $d$ mg/L, at various depths, $h$ meters, in a specific estuary. Data from a random sample of 10 locations are summarized as follows:

\sum h = 155 \quad \sum h^2 = 2875 \quad \sum d = 62.4 \quad S_{dd} = 18.2 \quad \sum hd = 884.2

Calculate the values of $S_{hh}$ and $S_{hd}$ .

Calculate, to 3 significant figures, the product moment correlation coefficient between $h$ and $d$ .

The biologist also measured the water temperature, $t$ °C, at the same 10 locations. The product moment correlation coefficient between $h$ and $t$ was found to be $- 0.915$ .

Describe, giving a reason, the nature of the correlation you would expect to find between temperature ( $t$ ) and dissolved oxygen ( $d$ ).

2.2.2 Scatter diagrams and correlation

Question 19

Markscheme

2.2.2 Scatter diagrams and correlation

Question 19

Markscheme

2.2.2 Scatter diagrams and correlation

Question 19

2.2.2 Scatter diagrams and correlation Questions

2.2.2 Scatter diagrams and correlation

Question 19

2.2.2 Scatter diagrams and correlation Questions