MIS 345 Quizes
Which correlation coefficient suggests the strongest relationship?
+1
If the mean is 75 and two observations have values of 65 and 85, what is the squared deviation of each?
100
Which statement is not true?
Dealing with uncertainty includes eliminating uncertainty by using the normal probability distribution.
If the standard deviation of X is 15, the covariance of X and Y is 94.5, and the correlation is 0.90, then the variance of Y is 7.0.
False
The cutoff for defining a large correlation is 0.5.
False
The stages of the cross-industry standard process for data mining framework begins with data modeling
False
We cannot attempt to interpret correlations numerically, with the one possible exception of indicating whether they are positive or negative.
False
Researchers may try to gain insight into the characteristics of a population by examining a(n) _____ of the population.
Sample
The following are types of analytics except
Time series analytics
@Risk is an Excel® add-in that can be used to run replications of a simulation, keep track of outputs, create useful charts, and perform sensitivity analyses.
True
A distribution of a numerical variable with no skewness is said to be symmetric.
True
An example of a joint category of two variables is the count of all non-drinkers who are also nonsmokers.
True
Both ordinal and nominal variables are categorical.
True
Side-by-side box plots allow you to quickly see how two or more categories of a numerical variable compare.
True
The only meaningful way to summarize categorical data is with counts of observations in the categories.
True
The scatterplot is a graphical technique used to indicate the relationship between two numerical variables.
True
Three important themes run through the Business Analytics: Data Analysis & Decision Making text: data analysis, decision-making, and dealing with uncertainty.
True
Although it is relatively easy to collect data, it can be more challenging to understand what the data mean.
True
Displaying all correlations between 0.6 and 0.999 on a scatterplot as green and all correlations between -1.0 and -0.6 as red is known as:
conditional formatting
What is not one of the important themes of your Business Analytics: Data Analysis & Decision Making text?
data mining
One characteristic of "paired variables" is that:
each variable has the same number of observations
The length of the box in the box plot portrays the:
interquartile range
What measure of distribution relates to extreme events, such as a stock market crash?
kurtosis
Which of the following would not be included under data analysis?
measuring uncertainty
Expressed in percentiles, the interquartile range is the difference between the:
the 25th and 75th percentile
How is the median defined if the number of observations is even?
the average of the two middle observations
A line or curve superimposed on a scatterplot to quantify an apparent relationship is known as a(n):
trend line