A researcher wanted to see whether the climate in a room affects the time it takes to reach REM sleep (in minutes) in a bedroom that is 80°. On the first night, participants were given a ceiling fan that circulated the air in the room at a moderate speed. On the second night, the same participants slept in a room without any air circulation.

If you perform FFT on 20 seconds of data with no averaging, what are the first 3 values of the corresponding frequency vector in Hz?

Leo used an analog sensor to measure the temperature of his solar panels. After the experiment, he wants to process the data he obtained. Is he allowed to describe the data by using the measures of central tendency? No, because the data he gathered is qualitative in nature. Yes, because the data he gathered is quantitative in nature. No, because the data the gathered is quantitative in nature. Yes, because the data he gathered is qualitative in nature.

There is a strong negative association between latitude (angular distance north or south of the Earth's equator) and skin cancer rates. (i)   Does this mean that low latitudes cause skin cancer rates to increase? Explain your answer in one or two sentences.

Measuring the height of a Yellow Meranti is very difficult because these trees grow to heights over 300 feet. In 2016, a group of Yellow Meranti in Sabah’s Danum Valley was announced as the tallest tropical trees in the world. People familiar with these trees understand that the height of a Yellow Meranti is related to other characteristics of the tree, including the diameter of the tree at the breast height of a person (in inches) and the thickness of the bark of the tree (in inches). The file YellowMeranti contains the height, diameter at breast height of a person, and bark thickness for a sample of 40 Yellow Meranti trees. Height Diameter at breast height Bark thickness 134 24 1.2 213 30 3.1 183 22 2.2 90 12 1.3 147 28 2.2 110 33 1.5 190 56 2 89 12 1.2 165 29 2.8 124 13 1.7 92 14 1.5 180 56 2.5 224 47 2.2 191 33 2.8 175 20 3.3 253 46 2.9 246 50 4.7 237 57 4.4 253 43 2.4 210 37 3.9 233 10 1.5 122 22 1.1 194 27 2.8 167 20 2 82 11…

The alternating cycles of the rise and fall of the ocean are called tides. Tides in one section of the harbor in the Bay of Fundy caused the water depth to vary. The maximum water depth occurs at (3, 17.5) and the minimum water depth occurs at (9, 4.5). 20 (3. 17.5) 10 (9. 4.5) 10 20 Time (Hours) Water depth (metres)

Explain the effect of α level on power?

A series of locks manages the water height along a water source used to produce energy. As the locks are opened and closed, the water height between two consecutive locks fluctuates. The height of the water at point B located between two locks is observed. Water height measurements are made every 10 minutes beginning at 8:00 a.m.