Unit 1 Section 2 Review

General Statistics Info (Section 1)

1

One way to gather data.

What are surveys?

2

Define data

What is information that is collected and recorded

3

Define variability & why do we need it?

What is varying data (spread out data) & need it to have data - otherwise just have info (have to be able to ask statistical questions and need variability for that.  

4

2 types of variables & the difference

What are numerical and categorical variables. Num = just numbers (random), Cat = words or NUMBERS THAT ARE GROUPED. 

5

4 parts of the data cycle & an example of one part. 

What are pose statistical investigative question, collect data, analyze data & interpret data.

Examples will vary: stat question, table of info, graph of data, an answer to a stat question 

Tangible Plots & Typical

1

typical always center?

What is no.

2

define frequency 

what is the count/number of times the outcome occurs

3

define typical & give ex. 

what is the data that has the most common occurrence

Examples vary (Ex: most students got 4 hours of sleep or we typically prefer sweer snacks)

4

better representation that a tangible plot, why?

what is a dotplot because the data is organized and easier to read/interpret

5

find range

What is maximum value - minimum value =range

Histograms & Shapes

1

bin on a histogram

what is the sections on x-axis (what we count by)

2

Symmetric 

what is the histogram that has a peak and matches on both sides

3

3 types of modes for histograms & meaning

Unimodal (1 peak), bimodal (2 peaks), multimodal (more than 2 peaks)

4

right-skewed vs left-skewed

right = peak on left and tails to right

left = peak on right and tails to left

5

algorithm & example

Bonus = what did we do when learning this?

what is a specific input (typed exactly correct (syntax)) that produces the same output every time.

Bonus = peanut butter jelly sandwich 

Exploring Food Habits & Variables

1

One function on dashboard 

Answers vary

what is... 

- histograms (when - date & time), donut plot (when - time of day, salty/sweet, cost, why), bargraphs (healthy level, calories), word plot, pictures of snacks (click for all info), map (location survey submitted)

2

Plot app function - what's it do?

What is a tool to plot any x & y variable provided on a graph

3

Function used for 2 numerical variables 

what is a scatterplot or xyplot

4

Example of a variable on cdc data & example of a variable on food data

Answers vary

5

Describe difference between grouping & splitting/faceting - in input (code) AND in output (plot/graph)

what is: 

codes: for grouping, groups = (variable) at end of code, for splitting | then variable after the original variables on x & y axis

plots: grouping has data grouped on one graph (using different colors or types of dots or splitting the bars into multiple sections), and splitting has data split onto multiple graphs based on the variable (Ex: gender= 2 side by side graphs, healthy level = 5 side by side graphs)

RStudio Basics & Labs 1A-1E

1

symbol to take notes in RScript

what is #

2

2 codes that give same info as dim(cdc)

what is nrow(cdc) and ncol(cdc)

3

3 steps to input food data

bonus = extra direction between step 2 & 3

what is export, upload, import

bonus = rename dataset

4

 label a new lab? (4 pieces)

what is # (2 for 2nd hour, 3 for 3rd hour), lab name (ex: lab 1E), last name, first name

5

basic coding formula & what each piece is & example

what is function(y~x, data=____)

function = type of output

y & x = outputs

~ tilde

data= ____ is name of data set

Ex: will vary. Ex: histogram(~sugar, data=food)