Test of Equality of Variances When testing two independent samples (for differences in mean, one-sided tests, etc.), it is helpful to know that the samples have equal variances or not.
JHK2303/iStock/Getty Images. Chambray, a double-ply cotton fabric with a tight weave, is similar to denim but not the same. It has a white filler thread woven in with a colored background thread. But unlike denim's twill weave, chambray has a plain weave, so it's smoother and lighter in weight.Chambray is rugged but light, making it suitable for work wear as well as summer-weight shirts and skirts.ut unlike denim's twill weave, chambray has a plain weave, so it's smoother and lighter in weight. Chambray is rugged but light, making it suitable for work wear as well as summer-weight shirts and skirts.
Chambray is the lighter of the two fabrics; sort of like muslin. It is also usually light blue in color. Denim is the heavier of the two fabrics; similar to a lightweight canvas. It is usually dark blue-darker than chambray.Chambray is usually used to make long and short sleeved work shirts, while denim is usually used to make work pants or jeans.DDITIVE colors are like colored lights. SUBTRACTIVE colors are like paint. For additive colors, you can make yellow from adding red and green light. Or yellow, being a spectral color, means that light of a pure certain wavelength, around 570nm, is itself yellow.