GRADED A ACTUAL EXAM Questions and Answers Solved

RMHI EXAM

GRADED A+ (ACTUAL EXAM ) Questions and Answers (Solved)

• *

Answer: multiplication operator

• ^

Answer: taking powers operator

• < -

Answer: assignment operator

• ==

Answer: equality operator

• !=

Answer: inequality operator

• Functions take arguments, for example...

Answer: sqrt(...) square root of...

• 3 variable classes

Answer: numeric, logical, character

• what is a vector?

Answer: lists of variables of the same class

• operationalization

Answer: Clearly defining variables in terms of how they can be measured

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• operationalisation steps

Answer: construct, measure, observation

• variable types that explain

Answer: predictor independent variable

Treatment

• variable types that need explaining

Answer: outcome dependent

Response

• What are descriptive statistics?

Example: Descriptive statistics are summary statistics that allow the researcher to organize data to give meaning and facilitate insight.

Histogram

• measures of central tendency

Answer: mean, median, mode

• Measures of Spread

Answer: Range, Interquartile Range, Standard Deviation

How wide is the data?

• Pipes in r

Answer: Take your data...... Do one thing... ...Then do another... ... And then one more

performs a sequence of operations on the dataset

• what do filter() and arrange() do?

Answer: filter() lets you select a subset of the rows of the tibble, and arrange() tells you how to sort them

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• what does mutate() allow you to do?

Answer: calculate new variables

• pivot_longer()

Answer: converts from wide to long format by decreasing the number of columns

and increasing the number of rows

• pivot_wider()

Answer: "widens" data, increasing the number of columns and decreas- ing the number of rows

• geoms

Answer: specify what the plot should look like (i.e., what kind of plot it is). Geoms take arguments that affect how the parts of them look.

• Facets

Answer: allow you to break your data into different panels, where each panel

corresponds to one of the values of the given variable.

• Themes

Answer: make the plot look nice in terms of background colours and things like that

24. geoms for one variable, continuous:

Answer: geom_histogram() geom_density() geom_dotplot()

25. geoms for two variables, continuous:

Answer: geom_point() geom_rug() geom_jitter()

26. geons for two variables, one discrete:

Answer: geom_boxplot() geom_violin()

• fill

Answer: fills in colour

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