gs gs119 Data Preprocessing - Data Reduction - Quiz No.2
gs gs119 Data Science Quiz
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Question 1: Given a dataset D, with T tuples, if S tuples are drawn from the dataset (S < T), where each tuple is equally likely to be sampled and the drawn tuples are not replaced. The technique is _____
Simple random sampling without replacement
Simple random sampling with replacement
Stratified sample
Cluster sample
Question 2: Which of the following is the most appropriate sampling technique represented by the following diagram?
Simple random sampling without replacement
Cluster sample
Simple random sampling with replacement
Stratified sample
Question 3: Given a sample A of size s drawn from a dataset of T tuple (s < T), which of the following is true?
Cost of drawing the sample A is proportional to s
Cost of drawing the sample A is proportional to T
Cost of drawing the sample A is proportional to T2
Cost of drawing the sample A is proportional to (s/T)2/3
Question 4: Which of the following is not true about attribute subset selection?
Minimum set of attributes is selected
The probability distribution of the created set is close to the original distribution using all the attributes
The probability distribution of the created set is completely different from the original distribution using all the attributes
It makes the study of patterns easier
Question 8: Log linear models are used for _____
Lossless data multiplication
Lossy data redundancy
Parametric data reduction
Non-parametric data reduction
Question 9: Given the regression equation y = wx + b, which of the following statements is false?
y is called predictor variable
x can be a numeric attribute
w and b are regression coefficients
Variance of y is assumed to be constant
Question 10: In equal depth histogram, which of the following is kept constant?
Frequency of the bucket
Width of the bucket
Mean of the bucket
Standard deviation of the bucket
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