Module 3

Question 1

Data analytics from start to finish: The tools of BA range from collecting the data (the start) to analyzing data (the finish)
this includes the following:

Answer 1

1. the data analytics process
2. the importance of statistics

Question 2

Data analytics proces: what do we do with data?

Answer 2

• collect
  -clean
  -organize
  -analyze
  -communicate

Question 3

measures of the data: we study:

Answer 3

1. measure of the center of the data (mean, median, mode)
2. measures of variation: range and standard dviation

Question 4

mean

Answer 4

the most common
mean = sum of values divided by the number of values
most affected by outliers

Question 5

The median

Answer 5

-middle number
-less senstive to outliers

Question 6

mode

Answer 6

occurs most often
not affected by outliers
may be no mode or several modes

Question 7

sample standard deviation

Answer 7

most commonly used measure of variation
shows variation about the mean
square root of variance
in excel it STDEV

Question 8

Histogram
-representation of the ___________ of ______ data
-great for checking how the data is ____

Answer 8

• distribution, numerical
  -spread

Question 9

correlation
- measures whether two variables _____
- a ___ correlation means they are unrelated
-a ____ correlation means they move in the same direction
-the _____ is a good way to visualize correlation
-coorelation is not ____

Answer 9

• move together
  -0
  -positive
  -XY scatterplot
  -causation

Question 10

Two types of categorical variables

Answer 10

input variables
-group data into segments
-0/1

Outcome variable
-group data into two outcomes
-essential to the concept of probabiltity

Question 11

hypothesis testing
method to decide whether the data in hand (____) sufficiently support a particular hypothesis about population parameters
a hypothesis test makes _____ statements about ____ parameters

Answer 11

• samples
  -probablistic, population

Question 12

P value
if <.05, we ____ H0
if > .05, we ____ H0

Answer 12

• reject
  -retain

Question 13

Type 1
Type 2
Type 3

Answer 13

1. both populations are the same group, comparing them
2. comparing ample 1 with sample 2, 2 populations with equal variances
3. comparing two samples, 2 populations with unequal variances

Question 14

Tails

Answer 14

2 tail, whether 2 populations are different from another
1 tail, whether one population mean is greater than or less that the other