Frequency distributions

Question 1

Steps to making a frequency Distribution?

Answer 1

find range
decide class interval width (i)
list the limits of each class interval
tally raw scores
add up tallies for interval frequency

Question 2

Range of a distribution

Answer 2

Highest value - lowest value

Question 3

Formula for class interval width?

Answer 3

Range / # of class intervals

Question 4

Percentile Point

Answer 4

value on a measurement scale below which a specified % of scores in the distribution fall….

Fn/Fi= DD/i
Fn= frequencies needed
Fi= frequency of interval
DD= desired distance
i= interval width

75th Percentile = value below which 75% points fall

Question 5

Percentile Rank

Answer 5

percentage of scores with values lower than the score in question?

Percentages of scores that fall below a specific raw score..

% rank= (Cum Fl + Fn/n)100

Question 6

Relative frequency

Answer 6

proportion of total number of scores that occur in each interval..
Relative f = f/N will = 1

Question 7

Cumulative frequency

Answer 7

number of scores that fall below the URL of each interval..
ex: looking at x3?
cum f = x3+x4+x5 … XN

Question 8

Cumulative Percentage?

Answer 8

Percentage of scores that fall below URL of each interval…

Cum%= (cumf/n)100