In some educational settings, the cost of textbooks approaches or even exceeds the cost of tuition. Given limited resources, it is important to better understand the impacts of free open educational resources (OER) on student outcomes. Utilizing digital resources such as OER can substantially reduce costs for students. The purpose of this study was to analyze whether the adoption of no-cost ope...

The concept of “believability” (of an agent) is difficult to pin down, making its value questionable for experimental design, quantitative empirical evaluations, and explanations of people’s perceptions of agents in general. We propose to replace “believability” with a set of finer-grained notions based on people’s attitudes that are better suited to these uses. Based on our analysis, we demons...

The statement, “Results of most non-traditional authorship attribution studies are not universally accepted as definitive,” is explicated. A variety of problems in these studies are listed and discussed: studies governed by expediency; a lack of competent research; flawed statistical techniques; corrupted primary data; lack of expertise in allied fields; a dilettantish approach; inadequate trea...

MAS314 Design of Experiments 15 May 2006, 14:30–16:30 Rubric: This paper has two Sections and you should attempt both Sections. Please read carefully the instructions given at the beginning of each Section. Calculators may be used. Cambridge Elementary Statistical Tables are provided. Section A: Each question carries 25 marks. You should attempt BOTH questions. Section B: Each question carries ...

A defining set of a t-(v, k, λ) design is a partial design which is contained in a unique t-design with the given parameters. A minimal defining set is a defining set, none of whose proper partial designs is a defining set. This paper proposes a new and more efficient algorithm that finds all non-isomorphic minimal defining sets of a given t-design. The complete list of minimal defining sets of...

A sender chooses ex ante how her information will be disclosed ex post. A receiver obtains public information and information disclosed by the sender. Then he takes one of two actions. The sender wishes to maximize the probability that the receiver takes the desired action. I show that the sender optimally discloses only whether the receiver’s utility is above a cuto¤, which makes the receiver ...

The effects of four different identity revelation modes (three fixed modes: real name, anonymity, nickname and one dynamic user self-choice mode) on participants’ perceptions toward their assessors, classroom climate, and past experience with the learning activity in which they were engaged were examined. A pretest-posttest quasi-experimental research design was adopted. Eight fifth-grade class...