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ERIC Number: EJ1202652
Record Type: Journal
Publication Date: 2019
Pages: 7
Abstractor: As Provided
ISBN: N/A
ISSN: EISSN-2469-9896
Students' Conclusions from Measurement Data: The More Decimal Places, the Better?
Kok, Karel; Priemer, Burkhard; Musold, Wiebke; Masnick, Amy
Physical Review Physics Education Research, v15 n1 Article 010103 Jan-Jun 2019
In this study with 153 middle school students, we investigate the influence of the number of decimal places from the reading of a measurement device on students' decisions to change or keep an initial hypothesis about falling objects. Participants were divided into three groups, introduced to two experiments--the time it takes a free falling object with a zero, and a nonzero initial horizontal velocity to fall a certain distance--and asked to state a hypothesis that compares the falling times of the two experiments. We asked the participants whether they wanted to change or keep their initial hypothesis after they were provided with data sets. Members of each group were given the same number of measurements but with a different number of decimal places. Results show that for an increase in the number of decimal places, the number of participants switching from a false to a correct hypothesis decreases, and at the same time the number of students switching from a correct to a false hypothesis increases. These results indicate that showing more exact data to students--given through different resolutions of the measurement device--may hinder students' ability to compare data sets and may lead them to incorrect conclusions. We argue that this is due to students' lack of knowledge about measurement uncertainties and the concept of variance.
American Physical Society. One Physics Ellipse 4th Floor, College Park, MD 20740-3844. Tel: 301-209-3200; Fax: 301-209-0865; e-mail: assocpub@aps.org; Web site: http://prst-per.aps.org
Publication Type: Journal Articles; Reports - Research
Education Level: Middle Schools; Secondary Education; Junior High Schools; Grade 8; Elementary Education; Grade 9; High Schools; Grade 10
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Germany