biostatistics

Question 1

variable

Answer 1

is something whose value can vary

Question 2

qualitative (categorical) variable

Answer 2

a variable that cannot be measured in quantitative form but can only be identified as names or categories e.g type of drug

Question 3

quantitative variable (numerical)

Answer 3

can be measured numerically with 2 types - discrete and continuous. discrete :- whole numbers e.g episodes, continuous:- continue scale e.g weight

Question 4

nominal

Answer 4

values are names that cannot be ordered e.g eye color, occupation

Question 5

ordinal

Answer 5

values are attributes that are naturally ordered e.g level of pain

Question 6

frequency table

Answer 6

lists a set of values and how often they occur

Question 7

cumalative frequency

Answer 7

is the running total of frequencies in a table

Question 8

mean

Answer 8

calculated by summing all observations and dividing by the number of observations

Question 9

statistic

Answer 9

characteristic or measure obtained by using the date values from a sample

Question 10

parameter

Answer 10

characteristic or measure obtained by using all the data values from a specific population

Question 11

the median

Answer 11

halfway point in a data set, must be arranged in order. when there is no single middle value then it is midway between the 2

Question 12

the mode

Answer 12

value that occurs most often in the data set

Question 13

measures of dispersion

Answer 13

measures of spread are used to tell us how spread out the values are

Question 14

the range

Answer 14

highest value minus the lowest

Question 15

standard deviation

Answer 15

is the square root of the variance