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.
There are probably more similarities than differences between the two, but there are some differences. Chambray and denim are types of cloth fabrics. Usually, they are both blâ¦ue in color on the bolt, but color variations are available in both types. Both are coarse cloths, that is, the threads per inch in the cloths is lower than for finer, higher count fabrics such as percale. Both are made of cotton.