To determine her blood pressure, samantha divides up her day into three parts: morning, afternoon, and evening. she then measures her blood pressure at 2 randomly selected times during each part of the day. what type of sampling is used

Answer;

-Stratified sampling

Explanation;

-A Stratified Sample  is sample in which the population is divided into mutually exclusive groups, or strata and randomly drawn from each of these groups.

-With stratified sampling, the researcher divides the population into separate groups, called strata. Then, a probability sample (often a simple random sample ) is drawn from each group.

-Using stratified sampling, it may be possible to reduce the sample size required to achieve a given precision. Or it may be possible to increase the precision with the same sample size.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

when it is at an intermediate population density