Apart of a population that is used to gain knowledge about an entire population is called?
sample statistic
sample
population parameter
population

Sample

Step-by-step explanation:

The sample statistic is a value calculated from samples, which can be the mean of the sample or the standard deviation.

The sample is a part of the total population and is used to derive the sample statistic. In inference statistics, the information obtained from the sample is used to estimate the population parameters.

The population parameters are the values that describe a characteristic of the entire population.

Populations are the complete group of people or objects with some characteristics in common, it can also be events, business, animals, etc.

can you rephrase the question ? it is unclear : -)

step-by-step explanation:

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour