Suppose we have a sample of 5,000 subjects and we want to obtain a sample of 100 of them. We first divided the sample into 100 fragments of 50 subjects. Then, we select a random number between 1 and 50, to extract the first random individual from the first fragment: for example, 24. From this individual, the sample is defined by extracting the individuals from the list with 50-unit intervals, as follows: 24, 74, 124, 174, ..., 4.974. What type of sampling was used?

• stratified
• systematic
• by conglomerates
• for convenience

When the closest individuals are selected for statistical study, sampling is said to be used:

• by conglomerates
• systematic
• stratified
• for convenience

Temperature is considered a variable:

• discrete quantitative
• qualitative (categorical)
• continuous quantitative

The number of seats in the Festival Hall of the Centro de Bellas Artes is an example of a variable:

• continuous quantitative
• discrete quantitative
• qualitative (categorical)

The ranking of an award in the Olympics (first place, second place, third place) is an example of a measurement level:

• interval
• of reason
• nominal
• ordinal

Next, part of a frequency table is presented with which you must answer the question that is presented.

Limits Frequency

80-90 12

91-101 17

102-112 11

113-123 20

124-134 5

What is the relative frequency of the last class?

• 0.05
• 5
• 40
• 0.08
• 65

Next, part of a frequency table is presented with which you must answer the question that is presented.

Limits Frequency

80-90 12

91-101 17

102-112 11

113-123 20

124-134 5

What is the width of the classes?

• 12
• 6
• 11
• 5
• 10

Using the stem-and-leaf plot below, answer the question below.

Stem Leaf

14 5 7 9

15 2 3 4 4 6 7 8

16 2 2 2 3 3 4 4 5 7 7 8 9 9

17 0 1 1 2 3 4 4 5 6 6 8 9

18 0 1 3 5 6

What is the largest value represented on the graph?

• 186
• 180
• 169
• 18
• 6