Data 200 game day review

​Data 200
Game Day Review

By Catalina Medina

Extra credit opportunity

You can earn up to a 3% increase in your final grade. This will be determined by what proportion of questions you answer correctly.

The person with the highest score can replace one of their homework grades with their score from this.

You are not allowed to use any resources, this is to assess your own knowledge!

Multiple Choice

What function should I use to edit an existing column in my data frame?

• filter()

• mutate()

• slice()

• select()

Multiple Choice

Say I am trying to use a function called read_csv().

What is likely the issue if I get an error message saying:
“Error in read_csv() : could not find function ‘read_csv’”.

• It doesn't exist

• I haven't loaded the necessary package

• I gave it the wrong input

• I did not close the parentheses

Multiple Choice

Which code does not follow tidyverse style guide?

Multiple Choice

What function should I use to add a new column to my data frame?

• filter()

• mutate()

• group_by()

• select()

Multiple Choice

There are three species in the penguins dataset.

What will be the output of this code?

• A single number showing the mean flipper length for all penguins.

• A plot of average flipper length by species.

• A data frame with one row per species and one column

• The entire penguins data frame with a new column

Multiple Choice

What does one row in a data set represent?

• An observation

• A variable

• A column

• A data frame

Multiple Choice

What function should I use to drop a column from my dataset?

• filter()

• mutate()

• slice()

• select()

Multiple Choice

Which plot represents a variable with the lowest mean?

• A

• B

• C

• D

Multiple Choice

What is an appropriate plot type to visualize the relationship between a categorical and a numeric variable?

• single histogram

• standardized bar plot

• scatter plot

• side-by-side boxplots

Multiple Choice

For which question could I use linear regression?

• Predicting if a credit card transaction is fraudulent or not

• Grouping customers based on purchasing habits

• Categorizing types of fruits from images

• Predicting a person’s annual income

Multiple Choice

What was the point of learning GitHub?

• To make my life harder

• To track changes to files

• To install new R packages

• To make our code run faster

Multiple Choice

What is an appropriate R type for a discrete variable?

• factor

• date

• character

• numeric

Multiple Choice

What function should I use to drop a row from my dataset?

• filter()

• mutate()

• group_by()

• select()

Multiple Choice

Which one is an example of unsupervised machine learning?

• Regression

• Data Cleaning

• Clustering

• Labeled data

Multiple Choice

When building a regression model to predict Y, what are different terms used to describe our Y variable?

• Explanatory

• Feature

• Response

• Predictor

Multiple Choice

What function should I use if I want my newly joined data frame to only contain all rows and columns present in both of the original data frames?

• anti_join()

• inner_join()

• full_join()

• left_join()

Multiple Choice

Which code will read in data called `tiny_dogs.csv` from a folder called `my_data`.

Multiple Choice

What model could be appropriate to predict a categorical binary response variable?

• k-means clustering

• linear regression

• logistic regression

• frequentist hypothesis test for a single proportion

Multiple Choice

Which summary statistic can help me learn about the average value of my variable?

• standard deviation

• variance

• interquartile range

• median

Multiple Choice

Which plot represents a variable with the lowest variance?

• A

• B

• C

• D

Multiple Choice

The following are a 95% and a 80% confidence interval computed from the same sample.

(0.225, 0.375) and (0.253, 0.347)

Identify which one is the 80% confidence interval.

• First one

• Second one

• Third one

• Both

Multiple Choice

What is the value of `group` for a Gentoo penguin with a bill depth of 0.2 mm?

• Small boi

• Big boi

• Biggest boi

• Unknown

Multiple Choice

Which one is an example of supervised machine learning?

• Regression

• Data Cleaning

• Clustering

• Unlabeled data

Multiple Choice

When building a regression model to predict Y, what are different terms used to describe our X variable?

• Explanatory

• Response

• Target

• Outcome

Multiple Choice

Which of the following is a responsible use of AI in coding?

• Pasting in a homework question to get the answer

• To edit data to make my model fit better

• To debug or explain code

• Copying code from output when I don't understand

Multiple Choice

Which variable could this plot represent.

• Proportion of Americans with at least $10 in their bank account

• Housing prices for Ventura County

• Proportion of people that can do a cartwheel

• Percent of CSU Channel Islands students over 5 feet tall

Multiple Choice

For which question could I use logistic regression?

• Predicting if a credit card transaction is fraudulent or not

• Predicting sale price of a gaming console

• Categorizing types of fruits from images

• Predicting a person’s annual income

Multiple Choice

How many rows would be produced by `full_join(students, majors)`

• 3

• 4

• 5

• 7

Multiple Choice

What value helps me assess predictive error for linear regression?

• Standard deviation

• Accuracy

• Root Mean Squared Error

• Confidence interval

Multiple Choice

What value helps me assess predictive error for logistic regression?

• Standard deviation

• Accuracy

• Root Mean Squared Error

• Confidence interval

Multiple Choice

What model could be appropriate to predict a numeric continuous response variable?

• k-means clustering

• linear regression

• logistic regression

• frequentist hypothesis test for a single proportion

Multiple Choice

Which summary statistic can help me learn about the spread of my variable?

• mean

• maximum

• interquartile range

• median

Multiple Choice

Identify the hypotheses to test the following research question:

Do the majority of Americans approve allowing DACA immigrants to become citizens?

Let pi = proportion of Americans that approve.

Multiple Choice

What should be the first step after you import a dataset?

• Fit a model

• Inspect it

• Merge with another

• Change the csv file

Multiple Choice

Which plot represents a variable that is right skewed?

• A

• B

• C

• D

Multiple Choice

For a penguin with a flipper length of 0.7mm, what would is their value for `long_flippers`

• 0.8

• 0.7

• TRUE

• FALSE

Multiple Choice

What is the value of `group` for a Chinstrap penguin with a bill depth of 0.2 mm?

• Small boi

• Big boi

• Biggest boi

• No boi

Multiple Choice

When is your final project proposal due

• Monday, 11/24

• Tuesday, 11/25

• Wednesday 11/26

• Thursday 11/27