A recent study of 1,215 randomly selected middle school students revealed that the average number of minutes they spent completing homework during the school week was 180 minutes with a standard deviation of 45 minutes. Which of the following is the standard error, in minutes, of the sampling distribution of the mean number of minutes spent on homework per week for all middle school students?.

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ANSWER: b. Stratosphere and Thermosphere

EXPLANATION: The Stratosphere and Thermosphere are two main important layers of the atmosphere of Earth. Thermosphere is the major layer amongst all the layers and Stratosphere is the second major layer in the atmosphere. The thermospheric temperature increases as and when it absorbs the radiation of the sun. The stratosphere contains the Ozone layer which helps absorb the solar radiation and also the harmful UV rays.