Unit Quiz 1

Question 1

Identifiers of shape

Answer 1

Uní modal, bimodal

Right skewed, left skewed
Likely outliers

Question 2

Mean = median

Answer 2

Symmetric

Question 3

Mean > median

Answer 3

Right skewed

Question 4

Mean< median

Answer 4

Left skewed

Question 5

How to Identify outliers

Answer 5

Q1 -(1.5 * IQR)

Q3+(1.5*1QR)

Question 6

Center

Answer 6

Identify mean which si absolute value bar over x

Identify median, midpoint of all observations

Question 7

Spread

Answer 7

IQR: Q3-Q1
Standard deviation: avg distance away from the mean

Question 8

What does SOCS stand for

Answer 8

Shape outlier centers spread

Question 9

Histogram

Answer 9

Quantitative data, bars side by side
Use percents!

Question 10

Bar graph

Answer 10

Categorical data, bars have space in between
Use counts of qualitative data

Question 11

Individuals

Answer 11

Objects describes by a set of data(people, things, etc)

Question 12

Frequency table

Answer 12

Displays counts

Question 13

Relative frequency table

Answer 13

Shows percents

Question 14

Association

Answer 14

Knowing the value of one variable helps predict the other, mo association is graphs looks the same

Question 15

Mode

Answer 15

The most common value

Question 16

Skewed to the right

Answer 16

More data in left

Question 17

Skewed to the left

Answer 17

More data on right

Question 18

What to do when making stemplot

Answer 18

Always make a key!

Question 19

When to use back to back stemplot

Answer 19

To compare 2 categorical variables

Question 20

How to find center or midpoint of histogram

Answer 20

Look for the value in the middle of your categorical variables

Question 21

How are dotplots stemplot and histogram similar

Answer 21

They all use quantitative variables

Question 22

Range

Answer 22

Difference of largest and smallest value in data

Question 23

Resistance

Answer 23

Mean is not resistant
Median is resistant

Question 24

How are outliers identified in box plots

Answer 24

Data point identified outside the whiskers of the box plot, first found with 1.5*IQR rule

Question 25

Variance

Answer 25

The average squared deviation

Question 26

Steps to find standard deviation

Answer 26

Step 1: Find the mean.
Step 2: For each data point, find the square of its distance to the mean.
Step 3: Sum the values from Step 2.
Step 4: Divide by the number of data points.
Step 5: Take the square root.

Question 27

Is standard deviation ever less than zero

Answer 27

No it is always greater than or equal to 0
It equals zero When all observations have the same value

Question 28

Is standard deviation resistant

Answer 28

No

Question 29

4 step process

Answer 29

State: what’s the question you’re trying to answer
Plan: how will you go about answering the question? What statistical techniques does this problem call for?
Do: make graphs and carry out needed calculations
Conclude: give your conclusions in the setting of the real world problem

Question 30

Marginal distribution

Answer 30

Look at the margins of the table(in 2 way look far right at totals)
Can be represented as counts or percentage

Question 31

Conditional distribution

Answer 31

Based on the colum or row that condition is based on, strictly circle and focus that whole column and row and base your percentages from that total

Based on percentages

Question 32

Determine if marginal or conditional distribution:
Distribution fo % correct

Answer 32

Marginal
So you will use the total total value
And it can be % or counts
Use margins

Question 33

Determine if marginal or conditional distribution:
% of males in sample own their homes?

Answer 33

Conditional distribution
Only use percents

Use that on column(or row)that the condition is based off of!

Question 34

Determine if marginal or conditional distribution:
Distribution of scored among those who studied greater than 60 mins

Answer 34

Conditional distribution

Use percents

Only use that column(or row)!

Question 35

when do u use median and IQR vs mean and standard deviation

Answer 35

If the distribution is symmetric, then use the Mean & Standard Deviation. Otherwise If the distribution is skewed, then use the Median & IQR becuase exit is resistant

Question 36

Histogram bib width of 5

Answer 36

5 goes in the next bar
1st bar has 0,1,2,3,4