Question

the following are the scores of 25 students who participated in a psychology experiment. The scores represent the number of trials required to complete a memorization test.

12, 10, 12, 11, 6, 15, 14, 17, 9, 12, 13, 8, 7, 15, 14, 15, 18, 19, 14, 10, 14, 14, 16, 8, 9

Based on these data, the z score for generated for a person with a raw score of 6 is___ and their percentile is___

Answer 1

The data provided is:

	Data
	12
	10
	12
	11
	6
	15
	14
	17
	9
	12
	13
	8
	7
	15
	14
	15
	18
	19
	14
	10
	14
	14
	16
	8
	9
Count	25
Mean	12.48
SD	3.465545

The Z score for raw score 6 is:

The percentile is calculated as

P(Z<-1.8698) = 0.0694546159801832

Hence the percentile is 6.9455%

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