PCDE Course Module 2 Content
Introduction
INTRO HERE
Knowledge Check 2.2: Probabilities and Histograms
- Which type of plot is recommended to display the probability of an event?
- A line plot
- A box plot
- A swarm plot
- A histogram (Correct)
- Which argument should be used in the .hist() function to display the value of
the events’ probability?
- density (Correct)
- likelihood
- prob
- height
- What is the recommended number of bins in
a histogram displaying the probability of 14 possible outcomes?
- 7 (INCORRECT)
- 10
- 14 (Correct)
- 28
- What does the
np.random.choice()function generate?- It generates a random sample of strings
- It generates a random sample of integers (Correct)
- It generates a random sample of floats
- It generates a random sample of booleans
- An event with a probability of 0.07 is:
- Guaranteed to happen
- Never going to happen
- Very likely to happen
- Not very likely to happen (Correct)
- What is the probability of the event of getting an even # when rolling a die?
- 0.5 (Correct)
- 0.33
- 0.16 (INCORRECT)
- 0.66 (INCORRECT)
- What is the probability of the event of
drawing a queen from a standard deck of cards?
- 0.079 Correct
- 0.79
- 0.81
- 0.081
- Which of the following is true?
- Probability & stats are the same
- Probability is a branch of applied math
- Probability deals with the likelihood of events a posteriori
- Probability is a branch of theoretical math (Correct)
Mini Lesson 2.6 Probability Distribution Functions
Mostly uses notes from Probability and Normal Distribution.
Knowledge Check 2.3: Probability Density Functions and Histograms
- What is sampling?
- Sampling is selecting the least significant feature of the data
- Sampling is extracting a smaller portion of your data to get a representation of the whole (Correct)
- Sampling is replacing some of your data with other data to obtain better results
- Sampling is slecting the most significant feature of the data
- Which of the following is true?
- The area under a distribution can be less than 1
- Given a histogram of continuous readings, the probability is computed in terms of an area Correct
- Given a histogram of continuous readings, the probability is computed in terms of a height
- The area under a distribution can be greater than 1
- Which of the following is false?
- A distribution with a smaller variance is narrower than a distribution with a larger variance
- Distributions always have different maximum values
- Distributions with larger variance is narrower than a distribution with a smaller variance (Correct)
- The mean of a distribution changes given different data
- Which of the following is not a type of random variable?
- Integer (Correct?)
- Discrete
- Boolean
- Continuous
- In a histogram representing the probability of an event:
- The total area highlighted by the bins must be equal to one (Correct)
- The total area highlighted by the bins does not represent anything
- The total area highlighted by the bins can equal something other than one
- The Y-axis represents the possible outcomes of an event
- A good probability density function:
- Does not change when the number of bins is varied
- None of these
- Fits the underlying distribution function for the event in consideration (Correct)
- Cannot be a continuous function
- What is true about the density of the data produced by the following code?
a = np.random.choice(np.arange(0,10),1000)- You get a density with bins with similar heights representing 1 000 outcomes 0~9 (Correct)
- You get a density wit bins with exactly the same height representing 1 000 outcomes between 0~9
- You get a density with bins with similar heights representing 1 000 outcomes between 0 and 10
- You get a density with bins with very different heights representing 1 000 outcomes between 0 and 9
Mini Lesson 2.7: Basics of Matplotlib
Mostly uses notes from MatplotLib: Python Plotting Library.
Mini-Lesson 2.8: Types of Matplotlib Plots
Notes are covered in MatplotLib: Python Plotting Library.
Knowledge Check 2.4: Plotting and Interpreting Data Using Matplotlib
- Which command is used in Matplotlib to create subplots?
- plt.subplotting()
- plt.Subplots()
- plt.subplots() (Correct)
- plt.sub_plots()
- Which command is used in Matplotlib to create a title for an axes object?
- ax.set_title() (Correct)
- ax.title() (INCORRECT)
- ax.SetTitle()
- ax.add_title()
- Which of the following is not a possible argument for the Matplotlib plot() function?
- width (Correct)
- marker
- c
- label
- Which of the following is true?
- Legends are automatically generated in Matplotlib
- A legend can be created using syntax plt.legend() (Correct)
- A legend can only display information about a limited amount of data
- The display position of a legend in a plot cannot be changed
- Which of the following is not an element of a Matplotlib plot?
- Origin (Correct)
- Axis
- Grid (INCORRECT)
- Axes
- Which of the following is true?
- Python plots can be created in numpy
- "Axis" and "axes" are synonyms in matplotlib
- Spines are lines denoting the area boundraries (Correct)
- Matplotlib is a programming language
- Which of the following is true?
- A histogram will not change when the number of bins is changed
- Histograms can be created using the plt.histogram() function
- Histograms are used to display statistical information (Correct)
- Histograms are used to represent categorical values
- Which of the following is false?
- A scatter plot always shows a correlation between two variables (Correct)
- Bar plots are used to show the relationship between different types of variables
- (INCORRECT)
- You can only display one set of data on a figure
- Line plots can be created using the plt.plot() command