Testing together: When do students learn more through collaborative tests?

2015 ◽  
Vol 1 (4) ◽  
pp. 377-389 ◽  
Author(s):  
Andrew B. LoGiudice ◽  
Amy A. Pachai ◽  
Joseph A. Kim
Keyword(s):  
Collaborative Tests

Students’ Perception on Collaborative Tests

2015 ◽  
Author(s):  
Auđbjörg Björnsdóttir ◽  
Joan Garfield ◽  
Michelle Everson
Keyword(s):  
Collaborative Tests

Thin Layer Chromatographic Method for the Detection of Uric Acid: Collaborative Study

1978 ◽  
Vol 61 (4) ◽  
pp. 903-905
Author(s):  
Joel J Thrasher ◽  
Annette Abadie
Keyword(s):  
Uric Acid ◽  
Thin Layer ◽  
Chromatographic Method ◽  
Phosphotungstic Acid ◽  
Collaborative Study ◽  
Lithium Carbonate ◽  
Improved Method ◽  
Color Development ◽  
Collaborative Tests ◽  
Layer Chromatography

Abstract A collaborative study has been completed on an improved method for the detection and confirmation of uric acid from bird and insect excreta. The proposed method involves the lithium carbonate solubilization of the suspect excreta material, followed by butanol-methanol-water-acetic acid thin layer chromatography, and trisodium phosphate-phosphotungstic acid color development. The collaborative tests resulted in 100% detection of uric acid standard at the 50 ng level and 75% detection at the 20–25 ng level. No false positives were reported during tests of compounds similar to uric acid. The proposed method has been adopted official first action; the present official final action method, 44.161, will be retained for screening purposes.

scholarly journals EVALUATING TWO MODELS OF COLLABORATIVE TESTS IN AN ONLINE INTRODUCTORY STATISTICS COURSE

2015 ◽  
Vol 14 (1) ◽  
pp. 36-59
Author(s):  
AUÐBJÖRG BJÖRNSDÓTTIR ◽  
JOAN GARFIELD ◽  
MICHELLE EVERSON
Keyword(s):  
Quantitative Methods ◽  
Statistics Education ◽  
Introductory Statistics ◽  
Qualitative And Quantitative Methods ◽  
Noticeable Increase ◽  
Research Journal ◽  
Significant Difference ◽  
Statistics Course ◽  
Students Attitudes ◽  
Collaborative Tests

This study explored the use of two different types of collaborative tests in an online introductory statistics course. A study was designed and carried out to investigate three research questions: (1) What is the difference in students’ learning between using consensus and non-consensus collaborative tests in the online environment?, (2) What is the effect of using consensus and non-consensus collaborative tests on students’ attitudes towards statistics?, and (3) How does using a required consensus vs. a non-consensus approach on collaborative tests affect group discussions? Qualitative and quantitative methods were used for data analysis. While no significant difference was found between groups using the two collaborative testing formats, there was a noticeable increase in students’ attitudes across both formats towards learning statistics. This supports prior research on the benefits of using collaborative tests in face-to-face courses. First published May 2015 at Statistics Education Research Journal Archives

Collaborative Study of Molecular Weight Determination Applicable to Samples with Molecular Weights Less Than 500

1968 ◽  
Vol 51 (6) ◽  
pp. 1231-1236
Author(s):  
C L Ogg ◽  
L H Scroggins
Keyword(s):  
Molecular Weight ◽  
Collaborative Study ◽  
Systematic Errors ◽  
Molecular Weight Determination ◽  
Random Errors ◽  
Molecular Weights ◽  
Collaborative Tests

Abstract A method for determining molecular weights employing the thermoelectricvapor pressure technique was tested by 13 collaborators. The samples used in the study were benzoic and nicotinic acids, n-hexadecylamine, methylpentadecyl ketone, benzylisothiourea hydrochloride, and sulfanilamide. Data from the six samples were analyzed statistically by Youden's technique for collaborative tests. Most deviation between laboratories was due to random errors; systematic errors were low. Choice of solvent and standard were critical. Methanol was shown to be unsatisfactory as a solvent. It is recommended that the method be adopted as official, first action.

Paper Chromatographic Detection of Adulteration in Dark Colored Fruit Juices

1969 ◽  
Vol 52 (3) ◽  
pp. 649-651
Author(s):  
J Fitelson
Keyword(s):  
Fruit Juices ◽  
Aqueous Extraction ◽  
Water Soluble ◽  
Individual Study ◽  
Commercial Feed ◽  
Collaborative Test ◽  
Chromatographic Detection ◽  
Collaborative Tests ◽  
Feed Samples

Abstract Individual and collaborative tests were made to demonstrate the differences between fat values obtained by the “washed” and “unwashed” methods and to define the crude fat method that yields the true fat values. In an individual study on 18 samples and in a collaborative test by 7 participants on 20 commercial feed samples, the fat values by the two methods were identical on many samples; the washed method yielded lower fat values on certain samples and higher values on other samples. The differences were as much as –49% or +64%. The results were statistically evaluated. Based on these results, it is recommended that a statement be included in method 22.033 for aqueous extraction of samples containing large quantities of water-soluble substances prior to the fat determination.

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