NEW
Font size
WorksheetsDSBDA Quiz
Total questions: 20
Worksheet time: 20mins
Which of the following are NOT data reduction techniques ?
Data cube aggregation
Numerosity reduction
Attribute subset selection
Decimal scaling
__________ Normalization performs a linear transformation on the original data.
Z-score
Min-max
Smoothing
Aggregation
Which of the following methods to perform dimension reduction ?
Missing values
Decision tree
Random forest
All of these
______________ is usually performed as an iterative two-step process consisting of discrepancy detection and data transformation.
Data reduction
Data integration
Data cleaning
Data transformation
A _____________ measure is a measure that must be computed on the entire data set as a whole.
distributive
holistic
unimodal
bimodal
KDD stands for________________.
Knowledge Database in Discovery
Known Discovery in Databases
Known Distributed Databases
Knowledge Discovery in Databases
Which of the following is NOT data preprocessing techniques ?
Data cleaning
Data integration
Data Handling
Data transformation
Concept hierarchies are a form of data smoothing. that can also be used for data
binarization
discretization
missing
all of these
Strategies for data reduction include
Attribute subset selection
Numerosity reduction
Data cube aggregation
All of these
The __________ of a data set is the average of all the data values.
Mean
Median
Mode
All of these
an ____________ is an observation that lies an abnormal distance from other in a random sample from a population.
Range
Quartiles
Outliers
None
The standard deviation of a data set is the positive square root of the ______.
Sample
Variance
Population
Outliers
Pearson's correlation coefficient is represented by
p
q
r
σ
The Wilcoxon Rank Sum Test is often described as the______ version of the two-sample t-test.
parametric
non-parametric
regular
none
Chi-square test is a________ method.
decision tree
clustering
hypothesis testing
correlation testing
The mean, median and mode of the t-distribution are equal to
Zero
One
Null
Minus one
In hypothesis testing, the hypothesis which is tentatively assumed to be true is called the_____
correct hypothesis
null hypothesis
alternative hypothesis
level of significance
The _______ of the Chi-squared distribution is twice the degrees of freedom.
variance
standard deviation
mode
none of the mentioned
Point out the wrong statement.
The normal distribution is asymmetric and peaked about its mode
A constant times a normally distributed random variable is also normally distributed
Sample means of normally distributed random variables are again normally distributed
None of the mentioned
The square root of the variance is called the _________ deviation.
mean
continuous
standard
empirical
