Question

The probability of concluding that assignable variation exists when only random variation is present is: (I) the probability of a Type I error. (II) known as the alpha risk. (III) highly unlikely. (IV) the sum of probabilities in the two tails of the normal distribution.

Answer 1

Answer:

Options I, II and IV

Explanation:

Type-I error in the probability arises where a null hypothesis is actually true and is rejected.

In a statistical test, alpha risk is the probability of making Type I error, it is the significance level being set for the test of hypothesis.

False signals can be present on either side of the normal distribution.

Thus as per the question, options I, II and IV follows.