2nd Edpuzzle Central Tendency and Variability

Question 1

The mean (arithmetic mean) is:

Answer 1

the point at which the distribution is in balance; The fulcrum or balancing point is calculated as this; first you add up all the individual scores there are. THEN you divide that number by The total Number of scores you had.

Question 2

What is the mode?

Answer 2

the most frequently occurring value in the dataset.

Question 3

What is the median?

Answer 3

the midpoint of a distribution: the same number of scores is above the median as below it.; find the middle TWO scores, add them together, and divide by 2

Question 4

What does ∑X mean?

Answer 4

is the sum of all the numbers in the population; add all the scores (sum)

Question 5

What does each X represent?

Answer 5

an individual score

Question 6

If you add up all the scores in the (X-M) column, what value will you always get?

Answer 6

These are deviation scores and will ‘balance’ each other to zero

Question 7

How to find the Sum of the Squares or (SS)?

Answer 7

Add all the values in the last column to find it

Question 8

What are the values we used to find the variance? ∑

Answer 8

SS/N Sum of the Squares divided by the Number of scores

Question 9

The standard deviation returns the variability measurement back into the original scale. The formula for the standard deviation is:

Answer 9

Square root of Variance