Tests the hypothesis that the Mueller-Lyer illusion will be less strong when an observer is distant from figures than when he is close, and presents results that do not confirm the hypothesis. (RW)

Two multivariate probability distributions, a generalized beta distribution and a generalized F distribution, are derived. Formulas for the moments of these distributions are given and an example of the bivariate generalized beta is presented. (Author/JKS)

Research on Piaget's four stages of cognitive development has shown that although nearly everyone passes through sensorimotor, preoperational, and concrete operational stages, most do not reach the stage of formal operations. Those people who do attain formal operations seem to have a curiosity factor not operative in those who don't. (Author/BRR)

An empirical study of the power of the F test in normal populations with variances proportional to the cell means is reported. The results indicate that the power of the test can be approximated by the noncentral F distribution with a modified parameter of noncentrality. (Author/CM)

Presents study designed to determine whether AP German Language Examination requires the same level of skill as third-year college German courses. Compares performances of AP German Language Examination candidates with college students completing second- or third-year German language courses. Results indicate AP exam is valid measure of competency…

Presents study designed to explore whether warning people about the possibility of future misinformation would increase their resistance to that misinformation. Results show exposure to a warning just prior to presentation of misinformation resulted in slightly greater resistance to its suggestive effects, but warnings after misinformation had…

Considerable judgment is required in scoring some McCarthy subtests, as this research showed the results of the Draw-A-Design test to be disagreeably scored. Oral Vocabulary and Draw-A-Child tests offered few scoring discrepancies between examiners. Two different studies and protocols are discussed. (CE)

Results of this investigation indicate that item format alone may be a factor affecting the performance of deaf students and that different conclusions may be possible concerning specific course objectives mastered. (Author)

Power and stability of Type I error rates are investigated for the Box-Scheffe test of homogeneity of variance with varying subsample sizes under conditions of normality and nonnormality. The test is shown to be robust to violation of the normality assumption when sampling is from a leptokurtic population. (Author/GK)

Guilford's average interrater correlation coefficient is shown to be related to the Friedman Rank Sum statistic. Under the null hypothesis of zero correlation, the resultant distribution is known and the hypothesis can be tested. Large sample and tied score cases are also considered. An example from Guilford (1954) is presented. (Author)

The F-distribution approximation suggested by Dixon was investigated at various combinations of alpha and degrees of freedom. Tabled values were compared with values computed utilizing the suggested formula. (Author/GSK)

The robustness of hypothesis tests for the correlation coefficient under varying conditions is discussed. The effects of violations of the assumptions of linearity, homoscedasticity, and kurtosis are examined. (JKS)