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Stats & Combinatorics Quick Quiz

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Key concepts in permutations, combinations, and central tendency.

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Stats & Combinatorics Quick Quiz
 

Stats & Combinatorics Quick QuizOnline version

Key concepts in permutations, combinations, and central tendency.

by Potillopérezjennifer
1

What is the key difference between a permutation and a combination?

2

How many ways can 5 people sit in 5 seats in a row?

3

What is the median of the data: 3, 1, 9, 7, 5?

4

What is the mode in the data: 2, 4, 4, 5, 6, 4, 8, 9?

5

Is it possible that r > n in a combination with repetition?

6

What does n mean in combinations?

7

What does r stand for in a combination?

8

Which situation requires order to be important?

9

For choosing a 4-digit password from digits 1-9 without repetition, which method counts possibilities?

10

Which measure represents the middle value when data are ordered?

Feedback

Permutations care about order; combinations do not.

5! = 120 permutations.

Order data: 1,3,5,7,9; middle value is 5.

The value with highest frequency is 4.

In combinations with repetition, r can exceed n.

n is the size of the original set.

r is the count of items selected from the initial set.

Order matters in permutations, not in combinations.

Ordering matters when forming a 4-digit code.

The median is the middle value after sorting.

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