Psychological Statictics

PSYCHOLOGICAL STATISTICS

WRITTEN REPORT

(GROUP 1)

Submitted by:

Aniban, George Jr. C.
Barrios, Annica Jewell V.
Centeno, Jan Vladimir D.
Cleofe, Ma. Gloria B.
Manere, Xyla A.
Orasa, Anne Mariel R.

Submitted to:
Mr. Lupiga

TABLE OF CONTENTS

Mean ……………………………………………………………… 3

Median ……………………………………………………………. 4

Mode …………………………………………………………….... 5 - 7

Standard Deviation ……………………………………………. 8 - 11

Slope Of The Line ……………………………………………… 12 - 14

Summary ………………………………………………………... 15 - 16

Quiz …………………………………………………………….... 17 - 20

• MEAN 

Statistical mean of a set of observation is the average measurement in a set of data.

• UNGROUPED DATA

Given the set of data values x1, x2, … xn from a finite population of size N the population mean is calculated as:[pic 1]

• GROUPED DATA

The calculation of mean from a frequency distribution is almost the same as that from an ungrouped data, only in a distribution, the individual values are not known. When the number of items is too large, it is best to compute for the measures of central tendency using a frequency distribution.

        To compute for the value of mean in a grouped data, we use the formula:[pic 2]

Where:  = summation Frequency multiplied by the Midpoint
             n = total number of frequency[pic 3]

• MEDIAN

        The median of a set of observations is the value that, when the observations are arranged in ascending order or descending order, satisfies the following condition:
a. If the number of observations is odd, the median is the middle value; and
b. If the number if observations is even, the median is the average of the two middle values.
        To compute the median of the grouped data; determine the value which divides the distribution into two equal parts. Therefore, the cumulative frequency “less than” of the given distribution has to be calculated.[pic 4]