Date of Award
Doctor of Philosophy
Lynn W. Glass
A content analysis was performed on one series of high school biology textbooks spanning a thirty-year time period from 1956 to 1985. Science textbooks were selected for the study because, in general, the textbook is the major curriculum guide in a science classroom. The subject of biology was selected because it is the science course most frequently taken by high school students, and for many students, it is their only high school science course;The textbook series selected for this longitudinal study was Modern Biology, published by Holt, Rinehart and Winston. The Holt series was selected because it has been one of the best selling high school biology textbooks since the 1930s;The specific aspect of the content analyzed was the presentation of science as inquiry. The concept of science as inquiry has been a major goal in science education for several years. This goal received increased attention during the curriculum movements of the 1960s. It was of interest to see if this theme was in evidence in one of the best selling high school biology textbook series. A four-by-three factorial design was used, with four years of publication crossing three subject areas. The four years of publication, representing roughly 10-year time intervals, were 1956, 1965, 1977 and 1985. To represent contrasts in anticipated levels of inquiry, the introductory, genetic and leaf structure chapters were analyzed. Level of inquiry was measured using linguistic content analysis, and the resulting categorical data were analyzed using logistic regression modeling. The linguistic content analysis method, applied in this study on an analysis of level of inquiry, could also be used to measure other aspects of textbooks;The study indicated that level of inquiry varied across the four editions studied. In particular, level of inquiry was higher in the 1965 and the 1977 editions, and lower in the 1957 and 1985 editions. Level of inquiry was highest in the introduction chapters and lowest in the leaf structure chapters. Level of inquiry was highest at the beginning of chapters, at the beginning of paragraphs, and in sentences which did not contain technical words. Level of inquiry also exhibited three significant two-way interactions with the above listed main effect terms.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Elizabeth Miles Eltinge
Eltinge, Elizabeth Miles, "Linguistic content analysis of the Holt, Rinehart and Winston series of high school biology textbooks: a longitudinal study focusing on the use of inquiry " (1988). Retrospective Theses and Dissertations. 9342.