GU Statistics. A+ Graded End Term Exam for
C955 / C784
A two way table is a display of - ✔✔the relationship of two variables that are both categorical
The appropriate display for the relationship between two variables based upon their type (Quantitative
or categorical) and their role (explanatory or response) is - ✔✔side by side box plots
What are the two simple graphical displays for visualizing the distribution of categorical data? - ✔✔The
pie chart and the bar chart
How does one calculate the standard deviation? - ✔✔Square each of the deviations: then,Average the
square deviations by adding them up, and dividing by n - 1, (one less than the sample size):
By distribution of a variable, we mean - ✔✔what values the variable takes and how often the variable
takes those values
A pie chart is a display for - ✔✔visualizing the distribution of categorical data
pictogram - ✔✔is a variation of a pie chart, but can be misleading
The three displays for one quantitative variable are - ✔✔histogram, stemplot and box plot
symetric distributions for one quantitative variable can be shaped in how many ways? - ✔✔Symmetric
(unimodal), single peaked, Symmetric (Bimodal) Double peaked and Symmetric uniform distribution
A right skew distribution - ✔✔has a tail that curves down to the right
A left skewed distribution - ✔✔Has a tail which curves up to the left.
, Can skewed distribution be bimodal? - ✔✔yes
Spread (Also called variability) - ✔✔can be described by the approximate range covered by the data.
In stemplots, - ✔✔the leaf is the right-most digit
The stem is everything but - ✔✔the right -most digit
To make a stem plot - ✔✔1. Separate each observation into a stem and a leaf
2. Write the stems in a vertical column with the smallest at the top and draw a vertical line at the right
of this column
3. Go through the data points and write each leaf in a row to the right of the stem
4. rearrange the leaves in an increasing order
A dotplot - ✔✔Is another type of display used to summarize a quantitative variable graphically.
Mode - ✔✔the most commonly occurinng value in a dataset
equation for mean - ✔✔a+b+c/3 (The denominator is always the number of variables added
Median - ✔✔The midpoint of a distribution
The Standard deviation - ✔✔calculate the mean. Calculate the difference between the mean and each
observation and the mean. square each figure determined from the previous computation,
Add up all the squared numbers and divide them by n(the total number of observations )-1.
The Standard deviation rule for "the normal shape" bell curve. - ✔✔Apporximatlely 68% of the
observations fall within 1 standard deviation, approx. 95% of the observations fall with 2 standard
deviations of the mean. Approx. 99.7% (or virtually all) of the observation fall withim three standard
deviations of the mean
C955 / C784
A two way table is a display of - ✔✔the relationship of two variables that are both categorical
The appropriate display for the relationship between two variables based upon their type (Quantitative
or categorical) and their role (explanatory or response) is - ✔✔side by side box plots
What are the two simple graphical displays for visualizing the distribution of categorical data? - ✔✔The
pie chart and the bar chart
How does one calculate the standard deviation? - ✔✔Square each of the deviations: then,Average the
square deviations by adding them up, and dividing by n - 1, (one less than the sample size):
By distribution of a variable, we mean - ✔✔what values the variable takes and how often the variable
takes those values
A pie chart is a display for - ✔✔visualizing the distribution of categorical data
pictogram - ✔✔is a variation of a pie chart, but can be misleading
The three displays for one quantitative variable are - ✔✔histogram, stemplot and box plot
symetric distributions for one quantitative variable can be shaped in how many ways? - ✔✔Symmetric
(unimodal), single peaked, Symmetric (Bimodal) Double peaked and Symmetric uniform distribution
A right skew distribution - ✔✔has a tail that curves down to the right
A left skewed distribution - ✔✔Has a tail which curves up to the left.
, Can skewed distribution be bimodal? - ✔✔yes
Spread (Also called variability) - ✔✔can be described by the approximate range covered by the data.
In stemplots, - ✔✔the leaf is the right-most digit
The stem is everything but - ✔✔the right -most digit
To make a stem plot - ✔✔1. Separate each observation into a stem and a leaf
2. Write the stems in a vertical column with the smallest at the top and draw a vertical line at the right
of this column
3. Go through the data points and write each leaf in a row to the right of the stem
4. rearrange the leaves in an increasing order
A dotplot - ✔✔Is another type of display used to summarize a quantitative variable graphically.
Mode - ✔✔the most commonly occurinng value in a dataset
equation for mean - ✔✔a+b+c/3 (The denominator is always the number of variables added
Median - ✔✔The midpoint of a distribution
The Standard deviation - ✔✔calculate the mean. Calculate the difference between the mean and each
observation and the mean. square each figure determined from the previous computation,
Add up all the squared numbers and divide them by n(the total number of observations )-1.
The Standard deviation rule for "the normal shape" bell curve. - ✔✔Apporximatlely 68% of the
observations fall within 1 standard deviation, approx. 95% of the observations fall with 2 standard
deviations of the mean. Approx. 99.7% (or virtually all) of the observation fall withim three standard
deviations of the mean
