Data recording, analysis and presentation

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Question 13

A psychologist investigated the effect of active retrieval practice on memory recall using a word-list test (with scores ranging from 0 to 30; higher scores indicate better recall).

Table 1: Memory recall scores for two groups of students

Passive Reading group		Active Recall group
Participant	Recall Score	Participant	Recall Score
a	15	a	22
b	18	b	25
c	14	c	21
d	16	d	28
e	17	e	24
f	13	f	23
g	19	g	27
h	15	h	26
i	16	i	20
		j	29
		k	22
		l	25

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

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

$9$

$11$

$12$

$21$

A psychologist investigated the effect of active retrieval practice on memory recall using a word-list test (with scores ranging from 0 to 30; higher scores indicate better recall).

Table 1: Memory recall scores for two groups of students

Passive Reading group		Active Recall group
Participant	Recall Score	Participant	Recall Score
a	15	a	22
b	18	b	25
c	14	c	21
d	16	d	28
e	17	e	24
f	13	f	23
g	19	g	27
h	15	h	26
i	16	i	20
		j	29
		k	22
		l	25

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

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

Data recording, analysis and presentation

Question 13

Table 1: Memory recall scores for two groups of students

Markscheme

Data recording, analysis and presentation

Question 13

Table 1: Memory recall scores for two groups of students

Markscheme

Data recording, analysis and presentation

Question 13

Table 1: Memory recall scores for two groups of students

Data recording, analysis and presentation Questions

Data recording, analysis and presentation

Question 13

Table 1: Memory recall scores for two groups of students

Data recording, analysis and presentation Questions