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A Monte Carlo Study of the Robustness and Power Associated with Selected Tests of Variance Equality when Distributions are Non-Normal and Dissimilar in Form (open access)

A Monte Carlo Study of the Robustness and Power Associated with Selected Tests of Variance Equality when Distributions are Non-Normal and Dissimilar in Form

When selecting a method for testing variance equality, a researcher should select a method which is robust to distribution non-normality and dissimilarity. The method should also possess sufficient power to ascertain departures from the equal variance hypothesis. This Monte Carlo study examined the robustness and power of five tests of variance equality under specific conditions. The tests examined included one procedure proposed by O'Brien (1978), two by O'Brien (1979), and two by Conover, Johnson, and Johnson (1981). Specific conditions included assorted combinations of the following factors: k=2 and k=3 groups, normal and non-normal distributional forms, similar and dissimilar distributional forms, and equal and unequal sample sizes. Under the k=2 group condition, a total of 180 combinations were examined. A total of 54 combinations were examined under the k=3 group condition. The Type I error rates and statistical power estimates were based upon 1000 replications in each combination examined. Results of this study suggest that when sample sizes are relatively large, all five procedures are robust to distribution non-normality and dissimilarity, as well as being sufficiently powerful.
Date: August 1990
Creator: Hardy, James C. (James Clifford)
System: The UNT Digital Library
Learning Style and Leadership Style: Determinants of Instructional Strategies in Nursing Education (open access)

Learning Style and Leadership Style: Determinants of Instructional Strategies in Nursing Education

The problem of this study was to describe and compare the relationship of learning style and leadership style upon the selection of instructional strategies by nursing educators in associate and baccalaureate degree nursing programs. Data were collected using Kolb's Learning Style Inventory, Hersey and Blanchard's Leader Effectiveness and Adaptability Description, a researcher-developed Instructional Strategies Inventory, and the Personal Data Form. It was found that leadership style was highly correlated between the associate degree and baccalaureate degree faculty groups. More of the associate degree faculty members had basic leadership styles of Low Relationship/Low Task and High Task/Low Relationship. Most of the baccalaureate faculty members had Low Relationship/Low Task leadership styles. The following conclusions were developed: (a) Nursing faculty in associate and baccalaureate degree programs have similar learning and leadership styles; (b) nursing faculty tend to use the traditional instructional strategies such as lecture, discussion, and case studies at the same frequency of use? and (c) the selection of instructional strategies in nursing education may be affected by variables other than the instructor's learning and leadership styles. In view of the findings of this study, the following recommendations for further study appear to be warranted, (a) Further research should be conducted to …
Date: August 1990
Creator: Lilly, Vivian Collette Foreman
System: The UNT Digital Library
Materials, Practices, and Perceptions Associated with Prior Participation in an Aerospace Education Workshop: a Case Study (open access)

Materials, Practices, and Perceptions Associated with Prior Participation in an Aerospace Education Workshop: a Case Study

This qualitative study was conducted in a large north Texas school district. The subjects were four elementary teachers who had previously attended a summer aerospace education workshop. The researcher observed in each classroom during science instruction and other areas where aerospace concepts might be taught to determine material usage, practices, and perceptions associated with teaching aerospace. The teachers' lesson planbooks, textbooks, and supplementary materials were also examined by the researcher. Interviews were conducted with each teacher's principal and the district science coordinator to determine their effects on the practices and perceptions of the subjects.
Date: May 1990
Creator: Boyd, Jacqueline Breeden
System: The UNT Digital Library