danaleeling

Weather and climate opened on Monday with weather sites. Wednesday was a climate video playlist. Could use rebuilding at this point.  Thursday 8:00 ran with inverted playlist to accommodate the steady drip-drip-drip arrival of students from 8:00 to 9:00.  The videos were paused to cover types of precipitation. Perhaps 11:00 could use a compressed playlist. In the past the playlist was omitted at 11:00. But the sky was featureless at 8:00 meaning almost no student could proceed. No clearly delineated clouds to work with. Which ended the morning session at 09:45.

The Fibobelly data from 10.1 was used to illustrate an independent sample t-test for a difference of sample means.  spreadsheet The line at 1.4992 illustrates a predicted population mean between the two confidence intervals that neither sample is expected to be able to have as a poulation mean. Desmos A Desmos file generates the same p-value using the ttest function. The Desmos file also makes use of being able to generate t-critical and the t-ditribution in the image. 

Students select two marbles from a box, one from each side of a divided box. One side includes marbles less than or equal to 5.2 grams, the other side contains marbles greater than 5.2 grams.  Data from spring 2026 demonstrated that students could distinguish which marble was more massive using a paired t-test and an alpha of 0.05. The ability of Desmos to display the t-distribution graphically (and calculate t-ciritical from data) allows for the graphical display of the result. The t-test capability displays the p-value based directly on the data. Desmos has become a powerful tool for displaying statistical results graphically. Calculating t-critical involves using tdist(n-1).inversecdf(0.975) for a 95% confidence interval. In the above example the test is an independent samples t-test, not a pairwise test of the differences.  Desmos To do a pairwise t-test the data has to be the pairwise differences, which can also be done as seen above.  Desmos This term ...

This laboratory has two separate goals.  To learn how rocks are characterized To learn to build a slide deck using mobile apps Questions to be explored in the laboratory: What are the three basic types of rocks? What is rock hardness? What is rock luster? What is rock breakage? What is rock color streak? What is the identification of your rock? On Pohnpei there are essentially two types of rocks. The black colored rock is basalt, a combination of minerals produced by the volcanic eruptions that formed the island. Basalt can be composed of different minerals. Basalt on Pohnpei contains iron which oxidizes to form red and brown colors. The red clay soils are also high in iron. There is so much iron in the ground that well water in some places has too much iron to be consumed by us. Out in Nett there is a special facility that removes iron from the well water. The other type of rock is coral, usually a white color. Coral is not a mineral because the origin of coral is in a living anim...