Asian-Pacific Journal of Second and Foreign Language Education

Table 2 Frequency distribution and descriptive indexes of responses related to the variable of performance, proficiency, and attitude

From: A study of the proficiency and performance of Iranian Air Traffic Controllers: attitude, work experience and specific aviation English courses

	Mean	Std. Deviation	Skewness	Kurtosis		Frequency	Percent
Performance	4.144	.449	-.015	.320	Low	0	0.0
					medium	41	15.2
					up	229	84.8
Proficiency	3.641	.533	-.049	.236	Low	4	1.5
					medium	143	53.0
					up	123	45.6
Attitude	4.157	.4822	.034	.108	Low	0	.00
					medium	40	14.8
					up	230	85.2

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