A particular personality inventory has 22 different scales for measuring 22 different traits. Each scale is standardized to have a mean of 50 for a national norm group. Dr. Snorf administers the entire inventory to a sample of college students and, for each scale, tests

against

($\alpha$= .05). Significant results are found only for the Responsibility Scale. On the basis of these results, Dr. Snorf reports that his college students are more responsible than the national group. Any comment?

Question

A particular personality inventory has 22 different scales for measuring 22 different traits. Each scale is standardized to have a mean of 50 for a national norm group. Dr. Snorf administers the entire inventory to a sample of college students and, for each scale, tests 
  
 against 
  
($\alpha$= .05). Significant results are found only for the Responsibility Scale. On the basis of these results, Dr. Snorf reports that his college students are more responsible than the national group. Any comment?

Quizplus · Accepted Answer

The Answer is For For we would expect 5%, or approximately 1 of Dr. Snorf's 22 tests to be significant even if were true in every case; his single significant result out of 22 tests may well be a Type I error.

For we would expect 5%, or approximately 1 of Dr. Snorf's 22 tests to be significant even if were true in every case; his single significant result out of 22 tests may well be a Type I error.

we would expect 5%, or approximately 1 of Dr. Snorf's 22 tests to be significant even if For we would expect 5%, or approximately 1 of Dr. Snorf's 22 tests to be significant even if were true in every case; his single significant result out of 22 tests may well be a Type I error.

were true in every case; his single significant result out of 22 tests may well be a Type I error.

A Particular Personality Inventory Has 22 Different Scales for Measuring α\alphaα

A Particular Personality Inventory Has 22 Different Scales for Measuring $\alpha$