A biochemist is investigating the relationship between the concentration of a catalyst, $C$ (in mg/L), and the rate of a specific chemical reaction, $R$ (in units/sec). The results for 8 unique samples are recorded in the table below.

Sample	1	2	3	4	5	6	7	8
$C$	1.2	0.5	3.8	2.1	0.9	4.5	1.7	2.9
$R$	14.2	6.4	28.5	19.1	11.8	35.2	10.5	22.7

Calculate the Spearman's rank correlation coefficient between $C$ and $R$ .

A laboratory colleague claims that there is no correlation between the catalyst concentration and the reaction rate in the population from which these samples were drawn.

Test, at the 5% level of significance, the colleague's claim. State your hypotheses clearly. (Critical value for $n = 8$ at 5% two-tailed is 0.7381)

Sample	1	2	3	4	5	6	7	8
$C$	1.2	0.5	3.8	2.1	0.9	4.5	1.7	2.9
$R$	14.2	6.4	28.5	19.1	11.8	35.2	10.5	22.7

Calculate the Spearman's rank correlation coefficient between $C$ and $R$ .

A laboratory colleague claims that there is no correlation between the catalyst concentration and the reaction rate in the population from which these samples were drawn.

Test, at the 5% level of significance, the colleague's claim. State your hypotheses clearly. (Critical value for $n = 8$ at 5% two-tailed is 0.7381)

2.2.2 Scatter diagrams and correlation

Question 79

Markscheme

2.2.2 Scatter diagrams and correlation

Question 79

Markscheme

2.2.2 Scatter diagrams and correlation

Question 79

2.2.2 Scatter diagrams and correlation Questions

2.2.2 Scatter diagrams and correlation

Question 79

2.2.2 Scatter diagrams and correlation Questions