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Desmos graphs t-distribution and calculates t-critical

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Desmos can now calculate t-critical values and graph the t-distribution, an upgrade from only being able to graph the normal distribution. Desmos The normal distribution showed area values larger than 0.95 when upper and lower bounds calculated using the t-distribution were entered. The availability of the t-distribution now shows the correct probability for upper and lower limits calculated using the t-distribution, a necessity when working with sample means. The function for generating t-critical for a sample size n and a 95% confidence interval: The period notation allows one to apply additional functions . These functions allow one to evaluate or manipulate the distribution in different ways. The Desmos file provides a visual approach to confidence interval hypothesis testing calculations done in Google Sheets . The above spreadsheet pulls data from exercises in chapter 9.2 and 10.1 of an MS 150 Statistics course. 
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Healthy sexuality

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Unit eight on healthy sexuality has been problematic for the past two runs of the SC 101 Health Science course. The students would prefer to be gender separated for this unit but the course schedule doesn't have that flexibility.  There are cultural and traditional factors underneath the discomfort. These are cultures where on one island women who are having their monthly were once sent to a women's house away from the village during that period of time. These things are not only not talked about, in some cases they are hidden away to the maximum extent possible.  This term the realization landed that the overhead hook system provided a way to put up a movable curtain. Women on one side, men on the other.  Feedback was only anecdotal at the end of the two sessions.  That feedback was very positive, with both the men and women expressing appreciation for and comfort with the arrangement. Out of sight really is out of min...
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10.1 Confidence interval hypothesis test

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  A confidence interval hypothesis test was done on the theory that the navel is located at the golden ratio, that the fibobelly ratio is the golden ratio.  Spreadsheet This was refuted for both the females and the males. The number line approach to interpreting confidence intervals was illustrated on the board.
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9.2 Paper aircraft confidence interval

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This term the aircraft were thrown from the second floor of the east end of the A classroom building. Downstairs after measuring distances, Estele and Tiepo looking out over the field of paper aircraft. Setting up to measure those that went negative. West breeze, very light, El Niño induced. Can you see the plane?  Caught a brief surge in the west wind. Way out near the fence line. Board work Spreadsheet for current term. A multi-term master also exists. 
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072 Arcseconds to meters conversion factor

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The heat and sun altered the laboratory to take advantage of shade and the new metric measuring wheel. Start location at 6° 54' 35" north, 158° 09' 30" east. 8:00 measured along a line of latitude. Iryann and Maicalany at the start location. The heat was concerning, so the class moved from shade location to shade location, taking advantage of the metric wheel. After a stop in the shade of the Terminalia catappa, the next shade was at the parking lot. iPhone Compass app users simply recorded the seconds value shown. Android users with GPSTest recorded arcseconds to the hundredth of an arcsecond.  GPSTest arcsecond data, distances were wherever there was shade. The new measuring wheel made this work beautifully. Shade was grabbed where it could be found along the route.  259 meters Ashton at the next shade stop. Board data At 11...
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071 Hide and seek

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The hide was behind a stand of bamboo beyond maintenance. Shady and obscured. There is one heck of a hidden, flooded pit to the west of here. A caution had to be sent out should anyone try to enter from that side.  The view back towards the gym. The top of the gym can just be seen. The hide is downslope out here. GPS Test has an awesome share function! Just realized that! Handles conversions and displays decimal seconds. Behind the bamboo. Voices could be heard by 12:15.  At 12:19 Ikaia spotted me through the brush. They came in from east of my position.  Marikai was navigating for the group, Ikaia was on the lead in brush . Hailey and Jaymar were in this group. Ikaia was keen to remain hidden and not reveal the hide. Genaeia was on lead of a second group. Marvin and Eugene were with Genaeia. Eugene was along as a plus one.  The rescuers...
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8.2 Five marbles and the standard error of the mean

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Materials required are marbles and a 200 gram scale. As was done last spring , this term a mix of marbles was used.  This term the current term spreadsheet was not properly setup. Column C was accidentally wiped along with columns A and B. This wiped F2, F3, and the corresponding cells below in F.  Students were given five marbles. This avoided an issue that had been created by giving students five of the same marbles. When different sets of five were in use, some were the smaller, lighter blue marbles and these would generally not capture the population mean. A spreadsheet, single tab for the Smartboard memory limitations, is used to generate data.  After the first five marbles were massed the point estimate of the population mean was 5.22. The massing was paused to explain that this was the best estimate of the population mean for that student. The point estimate for the population mean.  By an absolute accident, Kozel wound up with five 5.2 gram marbles, a stand...
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