1. Unsystematic variation (noise) affects the ________ of a sample. A . size B .

Question

1. Unsystematic variation (noise) affects the ________ of a sample.

A. size

B. mean

C. standard deviation

D. correlation coefficient

E. all of the above

2. In a t-test, if I use an alpha level of 10 instead of the usual 5%,...

A. my power is decreasing and my type I error probability is decreasing.

B. my power is increasing but my type I error probability is also increasing.

C. my type II error probability is increasing.

D. the probability to detect an existing difference is decreasing.

Can someone help me answer the two questions, please.

Explanation / Answer

1 ans ) Unsystematic variation (noise) affects the ________ of a sample.

size of the sample affects

option a

2 ans ) C. my type II error probability is increasing.

option c

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