WGU C955 APPLIED PROBABILITY AND
STATISTICS UPDATED ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS FULL
SOLUTION GRADED A+
◉ Sample. Answer: A subgroup of the population. Eg, "the 1 bedroom
apartments with dishwashers."
◉ Steps in the statistics process. Answer: 1. PRODUCE DATA (by
studying a sample of the population)
2. EXPLORATORY DATA ANALYSIS (Summarize data.)
3. PROBABILITY ANALYSIS (Determine how the sample may
differ from the population.)
4. INFERENCE (draw conclusions)
◉ Data. Answer: pieces of info about individuals organized into
variables
◉ Individual. Answer: a particular person or object
◉ Variable. Answer: a particular characteristic of the individual
,◉ Dataset. Answer: a set of data identified with particular
circumstances. Typically displayed in tables with rows as the
individuals and columns as the variables
◉ Quantitative vs Categorical/Qualitative variables. Answer:
Quantitaive: Numerical values. Represent a measurement.
Categorical: category or label values into which individuals are
grouped.
◉ Three steps in Exploratory Data Analysis. Answer: 1. Organize and
SUMMARIZE raw data
2. DISCOVER important features and patterns and striking
deviations.
3. INTERPRET findings in the context of the problem
◉ Examining Distributions. Answer: exploring data obtained from
one variable at a time
◉ Examining Relationships. Answer: exploring data obtained from
two variables at a time
◉ Distribution. Answer: what values the variable takes, how often
◉ Three types of graphical displays of categorical distributions.
Answer: 1. Pie Charts
2. Bar Charts
, 3. Pictogram
◉ Bins. Answer: ranges of data to make charting easier, like a bar
chart where each bar shows a range like 70-80%
◉ Numerical Summaries. Answer: category counts and percentages
◉ Four types of Graphical displays of Quantitative Variables. Answer:
1. Histogram
2. Stemplot
3. Dotplot
4. Boxplot
◉ Histogram. Answer: like a bar chart but the x axis is numerical, in
order. Eg: x axis is years, y axis is Men's income and Women's
income. Or, the x axis is number of hours studied, and y axis is
number of students falling into each number of hours studied
category.
◉ 4 ways to interpret a histogram. Answer: 1. Shape -
Symmetry/Skewness, Peakness (Modality)
2. Center - midpoint
3. Spread - approx range covered by all the data
4. Outliers - observations that fall outside overall pattern
STATISTICS UPDATED ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS FULL
SOLUTION GRADED A+
◉ Sample. Answer: A subgroup of the population. Eg, "the 1 bedroom
apartments with dishwashers."
◉ Steps in the statistics process. Answer: 1. PRODUCE DATA (by
studying a sample of the population)
2. EXPLORATORY DATA ANALYSIS (Summarize data.)
3. PROBABILITY ANALYSIS (Determine how the sample may
differ from the population.)
4. INFERENCE (draw conclusions)
◉ Data. Answer: pieces of info about individuals organized into
variables
◉ Individual. Answer: a particular person or object
◉ Variable. Answer: a particular characteristic of the individual
,◉ Dataset. Answer: a set of data identified with particular
circumstances. Typically displayed in tables with rows as the
individuals and columns as the variables
◉ Quantitative vs Categorical/Qualitative variables. Answer:
Quantitaive: Numerical values. Represent a measurement.
Categorical: category or label values into which individuals are
grouped.
◉ Three steps in Exploratory Data Analysis. Answer: 1. Organize and
SUMMARIZE raw data
2. DISCOVER important features and patterns and striking
deviations.
3. INTERPRET findings in the context of the problem
◉ Examining Distributions. Answer: exploring data obtained from
one variable at a time
◉ Examining Relationships. Answer: exploring data obtained from
two variables at a time
◉ Distribution. Answer: what values the variable takes, how often
◉ Three types of graphical displays of categorical distributions.
Answer: 1. Pie Charts
2. Bar Charts
, 3. Pictogram
◉ Bins. Answer: ranges of data to make charting easier, like a bar
chart where each bar shows a range like 70-80%
◉ Numerical Summaries. Answer: category counts and percentages
◉ Four types of Graphical displays of Quantitative Variables. Answer:
1. Histogram
2. Stemplot
3. Dotplot
4. Boxplot
◉ Histogram. Answer: like a bar chart but the x axis is numerical, in
order. Eg: x axis is years, y axis is Men's income and Women's
income. Or, the x axis is number of hours studied, and y axis is
number of students falling into each number of hours studied
category.
◉ 4 ways to interpret a histogram. Answer: 1. Shape -
Symmetry/Skewness, Peakness (Modality)
2. Center - midpoint
3. Spread - approx range covered by all the data
4. Outliers - observations that fall outside overall pattern
