A botanist is investigating the relationship between the moisture content of soil, $M$ (measured as a percentage), and the final growth height of a specific seedling species, $H$ (measured in cm). The data for 8 test plots are recorded in the table below.

Plot	A	B	C	D	E	F	G	H
Moisture ( $M$ %)	25	12	38	55	30	42	18	50
Height ( $H$ cm)	18.3	10.1	25.4	32.8	15.2	28.1	14.9	20.5

Calculate Spearman's rank correlation coefficient for these data.

Stating your hypotheses clearly, test at the 5% level of significance whether there is evidence of a positive correlation between soil moisture content and seedling growth height.

Plot	A	B	C	D	E	F	G	H
Moisture ( $M$ %)	25	12	38	55	30	42	18	50
Height ( $H$ cm)	18.3	10.1	25.4	32.8	15.2	28.1	14.9	20.5

Calculate Spearman's rank correlation coefficient for these data.

Stating your hypotheses clearly, test at the 5% level of significance whether there is evidence of a positive correlation between soil moisture content and seedling growth height.

2.2.2 Scatter diagrams and correlation

Question 39

Markscheme

2.2.2 Scatter diagrams and correlation

Question 39

Markscheme

2.2.2 Scatter diagrams and correlation

Question 39

2.2.2 Scatter diagrams and correlation Questions

2.2.2 Scatter diagrams and correlation

Question 39

2.2.2 Scatter diagrams and correlation Questions