Solve the Problem. -Three Randomly Selected Households Are Surveyed as a Pilot Project

question 168

Essay

Solve the problem.
-Three randomly selected households are surveyed as a pilot project for a larger survey to be conducted later.
The numbers of people in the households are 4, 6, and 10. Consider the values of 4, 6, and 10 to be a population.
Assume that samples of size n = 2 are randomly selected with replacement from the population of 4, 6, and 10.
The nine different samples are as follows:
(4, 4), (4, 6), (4, 10), (6, 4), (6, 6), (6, 10), (10, 4), (10, 6), and (10, 10). (i) Find the standard deviation of each of the
nine samples, then summarize the sampling distribution of the standard deviations in the format of a table
representing the probability distribution. (ii) Compare the population standard deviation to the mean of the
sample standard deviations. (iii) Do the sample standard deviations target the value of the population standard
deviation? In general, do standard deviations make good estimators of population standard deviation? Why or
why not?

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Definitions:

Rooting Reflex

An automatic response seen in newborns, where they turn their head toward any touch on their cheek or mouth, aiding in breastfeeding.

Cheek

The fleshy area located on either side of the face, below the eyes and between the nose and ear.

Neurons

Basic working units of the brain, specialized cells that transmit information to other nerve cells, muscle, or gland cells.

Prenatal Development

is the process of growth and development within the womb from conception to birth.