MEASURES OF CENTRAL TENDENCY OF UNGROUPED DATA

The observation which occurs most frequently in a sample is the___________

• median

• mean deviation

• standard deviation

• mode

What is the median of the sample 5, 5, 11, 9, 8, 5, 8 ?

• 5

• 6

• 8

• 9

To calculate the median, all the items of a series have to be arranged in a/an ________.

• DESCENDING

  ORDER

• ASCENDING ORDER

• ASCENDING OR DESCENDING ORDER

• NONE

_________ is not a measure of central tendency

• MODE

• MEAN

• RANGE

• MEDIAN

Which of the following is a characteristic of a mean?

• The sum of deviations from the mean is zero

• It minimizes the sum of squared deviations

• It is affected by extreme scores

• All of the above

Find the mode of the set of observation shown. 15, 13, 13, 14, 17, 17, 18, 12, 17.

• 17

• 14

• 13

• 15

What is the mean of the following numbers: 23, 45, 87, 40, 50?

• 49

• 34

• 56

• 78

If there is an even number of data in the data set how do you find the median?

• order the data and find the middle value

• order the data add the two middle values and divide by 2

When calculating the mean you need to _____________

• add all the numbers together and divide the number of items

• find the middle value

• multiply all the numbers

• Select the measure that appears most often in the set

The mean , median and mode are also known as __________

• measures of central tendency

• center values

• middle values