An investigator used t-test to compare two groups of students on verbal aptitude. He repeated his experiment 20 times and obtained significant difference 19 times. On the basis of this he decided to reject the null hypothesis. The probability of committing type I error was

An investigator used t-test to compare two groups of students on verba

1.	An investigator used t-test to compare two groups of students on verbal aptitude. He repeated his experiment 20 times and obtained significant difference 19 times. On the basis of this he decided to reject the null hypothesis. The probability of committing type I error was
A.	0.01
B.	0.02
C.	0.05
D.	0.10
Answer» D. 0.10

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An investigator used t-test to compare two groups of students on verbal aptitude. He repeated his experiment 20 times and obtained significant difference 19 times. On the basis of this he decided to reject the null hypothesis. The probability of committing type I error was

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