BITS WILP Data Mining Quiz-1 2017-H2

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Question 1
In association analysis, confidence measures certainty of the rule.
Select one:
True
False
Feedback
The correct answer is 'True'.
Question 2
An image recognition system identifies 4 books out of which only 2 are actually books. Actually, there were a total of 8 books in the image. The F1-score of the system is: 
Select one:
0.67
0.25
0.5
0.33
Feedback
The correct answer is: 0.33
Question 3
The entropy of a fair coin toss is:

Select one:
0.5
0
0.25
1
Feedback
The correct answer is: 1
Question 4
Analysis of patterns for stock market prediction is an example of:
Select one:
characterization and discrimination
correlation
outlier analysis
evolution analysis
Feedback
The correct answer is: evolution analysis
Question 5
In classification, we evaluate the performance of a classifier on training data

Select one:
True
False
Feedback
The correct answer is 'False'.
Question 6
A quiz question had names of 6 algorithms of which the student had to select only the classification algorithms. A student identified 3 of them as classification algorithms. During evaluation it was found that 2 of the algorithms identified by the student were indeed classification algorithms. The student was unable to identify 2 other classification algorithms in the list.
The recall is:
Select one:
0.60
0.50
0.33
0.73
Feedback
The correct answer is: 0.50
Question 7
MostFrequent - to find the most frequently occuring sample in the set.
MostFrequent is an example of:
Select one:
holistic measure
distributive measure
algebraic measure
none of the measures
Feedback
The correct answer is: holistic measure
Question 8
Given the following frequent itemsets. Assuming these are the only available 2,3, and 4-itemsets:
{AB}, {BC}, {AC}, {ABC}, {ABCD}, {ABD}, {BCD}, {ACD}
We can be certain that the itemset {ABD} is: 
Select one:
closed
neither maximal nor closed
maximal
not maximal
Feedback
The correct answer is: not maximal
Question 9
A boxplot can show outliers as small circles/points,
Select one:
True
False
Feedback
The correct answer is 'True'.
Question 10
A decision tree is split on the attribute with highest Gini Index.

Select one:
True
False
Feedback
The correct answer is 'False'.
Question 11
A quiz question had names of 10 algorithms of which the student had to select only the classification algorithms. A student identified 7 of them as classification algorithms. During evaluation it was found that 5 of the algorithms identified by the student were indeed classification algorithms. The student was unable to identify 4 other classification algorithms in the list.
The precision is:
Select one:
0.59
0.49
0.71
0.69
Feedback
The correct answer is: 0.71
Question 12
The following data is about a poll that occurred in 3 states. In state1, 50% of voters support Party1, in state2, 60% of the voters support Party1, and in state3, 35% of the voters support Party1. Of the total population of the three states, 40% live in state1, 25% live in state2, and 35% live in state3. Given that a voter supports Party1, what is the probability that he lives in state2?

Select one:
0.62
0.42
0.52
0.32
Feedback
The correct answer is: 0.32
Question 13
10, 2, 3, 4, 5, 3, 4, 6, 2
How many modes are there?
Select one:
a. 4
b. 1
c. 2
d. 3
Feedback
The correct answer is: 3
Question 14
A boxplot is nothing but a visual representation of IQR
Select one:
True
False
Feedback
The correct answer is 'False'.
Question 15
Given the following two sentences (which are same):
this is quiz 1.
this is quiz 1.
The cosine similarity between the two is:

Select one:
0
need more data
1
0.5
Feedback
The correct answer is: 1
Question 16
Number of groups is known apriori in:
Select one:
clustering
preprocessing
outlier
classification
Feedback
The correct answer is: classification
Question 17
Two sentences with no matching word will have a cosine similarity of 1.
Select one:
True
False
Feedback
The correct answer is 'False'.
Question 18
50th percentile is same as
Select one:
weighted mean
median
mean
midrange
Feedback
The correct answer is: median
Question 19
Holistic measure can be derived from distributive measures
Select one:
True
False
Feedback
The correct answer is 'False'.
Question 20
Decision tree splitting decision can be made based upon information gain of the attributes, but not based upon entropy of the attributes.

Select one:
True
False
Feedback
The correct answer is 'False'.

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