Explain why the standard deviation calculation differ for samples and populations.
What will be an ideal response?
The standard deviation is the average of the differences between the scores and the mean. For a population, this value is calculated using N to determine the average. However, the sample, as a representative of the population, will have lower variability than the whole population because you are not obtaining scores from every member, only a subset of the population. Thus, we adjust the standard deviation calculation for a sample to account for its lower variability and still provide a good estimate of the variability in the population the sample represents. We do this using n-1 (which are the degrees of freedom) in our calculation of the average of the deviations between the scores and the mean.
You might also like to view...
People who abuse more than one drug at a time are called
a. tolerants. b. polyabusers. c. multi-abusers. d. codependent. e. psychoactive.
Which of the following students provides the best definition of the term mnemonics?
a. Alfredo: "Mnemonics is the use of imagery to assist our memory." b. Julia: "Mnemonics is the use of external memory aids to improve our memory." c. Cynthia: "Mnemonics refers to using a strategy to improve our memory." d. Jaime: "Mnemonics is any memory trick that actually improves our prospective memory."
The average human can hear sounds within the range of ____.?
a. ?-100 to 1000 Hz b. ?0 to 10,000 Hz c. ?0 to 10,000 Hz d. ?100 to 100,000 Hz
________ is a successful development that occurs in children and adolescents despite exposure to stressful or traumatic experiences
a. Perceived popularity b. Resilience c. Clique participation d. Positive youth development