What is observed frequency?

What is observed frequency?

• A. The total sample size
• B. The number of individuals in each category that the experimenter actually observed
• C. The expected frequency
• D. The mean of counts

Answer: (B)

Observed frequency refers to the actual counts you record in each category in your sample. It is the number of individuals or cases that you directly observe falling into each category, not a prediction or average. This is different from the total sample size, which is the sum of those observed counts across all categories; it’s also different from the expected frequency, which is the count you would anticipate under a null hypothesis or theoretical model. The mean of counts would be the average across categories, not the specific observed tallies themselves. In analyses like the chi-square test, you compare these observed frequencies to the expected frequencies to assess whether any differences are due to chance.

Observed frequency refers to the actual counts you record in each category in your sample. It is the number of individuals or cases that you directly observe falling into each category, not a prediction or average. This is different from the total sample size, which is the sum of those observed counts across all categories; it’s also different from the expected frequency, which is the count you would anticipate under a null hypothesis or theoretical model. The mean of counts would be the average across categories, not the specific observed tallies themselves. In analyses like the chi-square test, you compare these observed frequencies to the expected frequencies to assess whether any differences are due to chance.