Exercise 1

We define population as the set of all elements of interest in a particular study. We define the sample as a subset of the population. Based on the concepts of population and sample, and what you studied in the assigned readings, identify the population and the sample in each exercise: (4 points)

2. In a survey of 1,050 randomly selected teenagers, 25% answered "yes" when asked do they like to read?
4. A researcher randomly selects 8 of the 30 members of a company's board of directors and then calculates the amount of time they have served.

Exercise 2

Determines whether the given value is a statistic or a parameter. (6 points)

2. The current Senate of Puerto Rico consists of 14 men and 13 women.
4. A sample of students is taken and the average time they waited in line to buy tickets for a concert was 1.5 hours.
6. In a study of 2,500 participants, 1,300 are university students.

Exercise 3

Identify in each case whether a qualitative, continuous quantitative or discrete quantitative variable is described. (5 points)

2. Height of first grade students at a school.
4. Number of students at a university in the country.
6. Eye color of the Miss Universe candidates.
8. Weight of babies born in the city hospital.
10. Number of cars in a town garage.

Exercise 4

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. (10 points)

2. Ratings of fantastic, good, average, poor, or unacceptable on a customer service survey.
4. Current temperatures in the towns of Puerto Rico.
6. The jersey numbers of the women who play in the Superior Basketball league of Puerto Rico.
8. The prices of university textbooks.
10. The postal codes of the towns of Puerto Rico.

Exercise 5

In each of the following, identify the type of sampling to which the premise refers: random, systematic, convenience, stratified or cluster: (10 points)

2. We want to carry out research with nursing students. A list is obtained from the Registrar's Office of Nursing students and they are divided according to the credits they have approved: 3-9, 10-16, 17-23, 24-30, 31-37, 38 or more.
4. In a group of numbered individuals, a number is chosen at random and suppose it is the number 5. Then, starting from this individual in the population, the sample will be defined in the following way: Starting with individual number 5, the sample will be completed. the sample by selecting individuals in intervals of 10, that is: 5, 15, 25, 35, 45, up to 995.
6. In a customer service survey of 1,200 adults, people were selected by using a computer to randomly generate phone numbers called.
8. An interview is conducted with those who voted in the last elections in the eastern area of the country.
10. A pharmacist wants to do a study to test the effectiveness of a new medicine for sugar control. Conduct the study with your employees because that way the study is more economical for the pharmaceutical company.

Exercise 6

According to the situation presented, answer the questions provided. (10 points)

A researcher conducted a survey among 500 adults in San Juan, Puerto Rico, who were leaving a restaurant that was close to their work. 55% indicated that they liked to drink coffee after dinner.

2. Identify the sample and the population.
4. The value 55% is a statistical data or parameter
6. What is the measurement level of the 55% value? (nominal, ordinal, interval or ratio).
8. The number of people in this survey is a continuous or discrete variable.
10. What type of sampling did the researcher use?