The answer is; to reduce statistical error and ensure a real representation the entire population.
The size of the sample size determines the precision or confidence level of the applied statistics. A proper sample size is able to capture the variability and uncertainties of the larger population and therefore estimate the larger population with good confidence levels.
Answer:
Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). More than 90 percent of all nitrogen fixation is effected by these organisms, which thus play an important role in the nitrogen cycle.
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The right answer is Wavelengths of energy.
White light is made up of all colors. The rainbow is actually the decomposition of white light by droplets of water like a prism.
Each color corresponds to an electromagnetic radiation of particular frequency and wavelength.
The sensitivity of the eye is maximum around 550 nm, in the yellow-green. The spectrum of visible light ranges from 400 to 780 nm but its perception depends on each individual (tastes and colors ...).
Answer:
The correct option is: A carbon atom can complete its valence shell by forming four covalent bonds
Explanation:
Carbon is a chemical element that belongs to the group 14 of the periodic table. The atomic number of carbon atom is 6 and it is denoted by the chemical symbol C.
The electronic configuration of carbon is: 1s², 2s², 2p².
Therefore, there are 2 electrons in the first electronic shell and 4 electrons in the second electronic shell of the carbon atom.
<u>There are </u><u>four valence electrons </u><u>in a carbon atom and thus it can form four covalent bonds to complete its valence shell. Therefore, carbon atom is tetravalent.</u>
