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.
Challis. Challis is a lightweight, woven fabric that has nice, flowy drape. It is usually made from rayon, but can also be found in wool and other contents. You can use challis fabric in lightweight, loose-fitting tops, dresses, skirts and pants. See our Pinterest page for inspirational ideas on using Challis.