Question

3. The formula for finding sample standard deviation is ________________.

a.𝑠=∑1▒𝑥−𝑥 ̅^2
b.𝜎^2=(∑1▒(𝑋−𝜇)^2 )/𝑁
c.𝑠^2=(∑1▒(𝑋−𝜇)^2 )/𝑁
d.𝑠^2=(∑1▒(𝑋−𝑋 ̅ )^2 )/(𝑁−1)
e. none of the above

Each of the empty boxes is filled with "A", some have "bars" over them.

Answer 1

I have no idea of the significance of the ones and rectangles of dots. If you want a square root symbol (√), use the (option + v) keys. The standard deviation for a sample is usually indicated with s, but the mean of a population is indicated by µ (option + m).

Subtract each of the scores from the sample mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

Choose the equation from that information.