Lecture 1+2+DLA

Question 1

What are the two man data types?

Answer 1

Quantitative/ numerical

qualitative / categorical

Question 2

subtypes of quantitative/ numerical data

Answer 2

discrete - whole numbers

continuous - a fraction or decimal

Question 3

subtypes of qualitative/ categorical data

Answer 3

nominal - naming variables such as hair color, race

ordinal - to describe the order of values

Question 4

subtypes of continuous data??

Answer 4

interval - time; have known differences

ratio - measurable interval; weight and height

Question 5

The measures of central tendency

Answer 5

mean, median, and mode

Question 6

measures of dispersion

Answer 6

variance, range, SD, interquartile range

Question 7

mean?

Answer 7

the average of all the numbers

Question 8

median?

Answer 8

the middle of shorted numbers

also find by:

n + 1 /2

n = number of observations

Question 9

mode

Answer 9

the number that appears most often

Question 10

what are histograms used for?

Answer 10

continuous and discrete data

Question 11

boxplots used for?

Answer 11

continuous and discrete data

Question 12

scatter plots used for?

Answer 12

continuous and discrete data

Question 13

bar charts used for?

Answer 13

categorical data

Question 14

frequency polygons are used for what?

Answer 14

categorical data

Question 15

pie charts are used for?

Answer 15

categorical data

Question 16

how to calculate the minimum and maximum on a box plot

Answer 16

min = Q1 - 1.5 x IQR

max = Q3 + 1.5 x IQR

Q1 = 25%
Q3 = 75 %
median = Q2 or between Q1 and Q3
Q1 - Q3 is the IQR