The tutor shares a few facts from his recent research of pain medications. In 1886, Doctors Arnold Cahn and Paul Hepp were trying naphthalene as a treatment for intestinal worms. They ordered more, but a pharmacist mistakenly sent acetanilide. One …

Lifestyle, history: how was acetaminophen discovered? Read more »

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Tutoring chemistry, you may mention kinetic energy of particles, diffusion, and effusion. The tutor gives a brief explanation. In my post from Jan 18, 2017, I define effuse: it means to escape from a container through a porous boundary. Graham’s …

Chemistry: Graham’s Law of Effusion Read more »

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Tutoring statistics, the tutor is happy to share the CONFIDENCE.T() function from LibreOffice Calc. My last couple of posts (here and here) I’ve talked about confidence intervals for the mean. Yesterday I mentioned finding one using Excel or LibreOffice Calc’s …

Statistics, spreadsheets: confidence interval for the mean, population standard deviation unknown: CONFIDENCE.T() function on LibreOffice Calc Read more »

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Tutoring statistics, you realize how convenient using a spreadsheet can be. In yesterday’s post I mentioned some theoretical points about two-sided confidence intervals for the population mean. On the practical side, if you simply need a confidence interval for the …

Statistics, spreadsheets: confidence interval for population mean: CONFIDENCE() function on Excel and LibreOffice Calc Read more »

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Tutoring statistics, confidence intervals are important. A two-sided confidence interval for the population mean is given by sample_mean – (standard_dev/n1/2)*sig_factor, sample_mean + (standard_dev/n1/2)*sig_factor The sig_factor (significance factor) depends on the certainty (confidence level) with which we want the confidence interval …

Statistics: confidence interval for the mean (two sided) Read more »

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Tutoring physics or chemistry, you might encounter Peukert’s Law, although it’s probably used more by industry. In my March 2 post I mentioned reserve capacity and Amp*hours as two ways to measure a battery’s potential output. Numerically they are convertible …

Battery output vs discharge rate: Peukert’s Law Read more »

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