Examlex
The various isotopes of an element all have
Z-test
A statistical test used to determine if there is a significant difference between sample and population means, assuming the population variance is known.
Chi-squared Test
The Chi-squared test is a statistical method used to determine if there is a significant difference between the expected and observed frequencies in one or more categories.
Test Statistic
A quantity derived from sample data used to make a decision about a hypothesis test.
Z
'Z' often represents the Z-score in statistics, which is the number of standard deviations a data point is from the mean of the data set.
Q15: The ratio by mass of carbon to
Q20: Microwave ovens work mainly by exciting molecules
Q26: With only two exceptions, if a nucleus
Q36: Calculate the frequency in hertz of photons
Q68: Changes that do not alter the chemical
Q73: Compounds formed when the atoms involved share
Q112: The analytical procedure that bombards a sample
Q114: State which element is oxidized and which
Q118: How many moles would 44 g of
Q123: In a covalent molecule, each atom (except