Data recording, analysis and presentation

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Question 91

An educational psychologist investigated the impact of ambient sound on reading comprehension using a standardized test (with scores ranging from 0 to 50; higher scores indicate better comprehension).

Table 1: Reading comprehension scores for two groups of participants

White Noise group		Silence group
Participant	Comprehension Score	Participant	Comprehension Score
A	34	J	42
B	28	K	38
C	31	L	45
D	35	M	41
E	29	N	39
F	30	O	44
G	33	P	40
		Q	47
		R	43
		S	41

What would be the value of $n\,$ in the formula below to calculate the standard deviation (SD) of the comprehension scores for the Silence group in this study?

\sqrt{\frac{\sum(x - \bar{x})^2}{n}}

$7$

$10$

$17$

$42$

Table 1: Reading comprehension scores for two groups of participants

White Noise group		Silence group
Participant	Comprehension Score	Participant	Comprehension Score
A	34	J	42
B	28	K	38
C	31	L	45
D	35	M	41
E	29	N	39
F	30	O	44
G	33	P	40
		Q	47
		R	43
		S	41

What would be the value of $n\,$ in the formula below to calculate the standard deviation (SD) of the comprehension scores for the Silence group in this study?

\sqrt{\frac{\sum(x - \bar{x})^2}{n}}

Data recording, analysis and presentation

Question 91

Table 1: Reading comprehension scores for two groups of participants

Markscheme

Data recording, analysis and presentation

Question 91

Table 1: Reading comprehension scores for two groups of participants

Markscheme

Data recording, analysis and presentation

Question 91

Table 1: Reading comprehension scores for two groups of participants

Data recording, analysis and presentation Questions

Data recording, analysis and presentation

Question 91

Table 1: Reading comprehension scores for two groups of participants

Data recording, analysis and presentation Questions