Asian-Pacific Journal of Second and Foreign Language Education

Table 4 The output of the Kolmogorov-Smirnov test to verify the normality of the performance, proficiency, and attitude variables

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

		Proficiency	Attitude	Performance
N		270	270	270
Normal Parameters^a	Mean	3.641	3.979	4.1600
Normal Parameters^a	Std. Deviation	.533	.2960	.43126
Most Extreme Differences	Absolute	.078	.085	.274
	Positive	.078	.083	.274
	Negative	-.076	-.083	-.272
Kolmogorov-Smirnov Z		1.280	1.313	1.240
Asymp. Sig. (2-tailed)		0.076	0.051	0.089

^aTest distribution is Normal

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