Question

Answer the following questions with this. Distinguish the types of variable (discrete and continuous), the types of scale (nominal, ordinal, interval and ratio) and the types of sampling (transversal, prospective and retrospective, simple, random, convenience, systematic, stratified, cluster or cluster)Recognize the difference between parameter and statistic.Recognize the difference between an observational and an experimental study.

1.Determine if the given values ​​come from a continuous or discrete data set. A sample of alpine goats has an average circumference at the base of the horns of 43.2 centimeters.

2.Determine which of the four levels of measurement (scales) is most appropriate. Doctors classify the severity of mild intermittent asthma, mild persistent asthma, moderate persistent asthma, severe persistent asthma, or difficult asthma.

3.Determine if the type of sampling used in this case is convenient, systematic, stratified or cluster (cluster) biologists study the pH level of the rivers of Puerto Rico obtain a sample of the water currents from a list randomly selecting a river every five on the list.

4.To monitor the monthly presence of the Giardia parasite in the Rio Grande, biologists collect samples in tubes from various locations randomly selected by a computer program.

5.Determine which of the four levels of measurement is most appropriate in this case. Doctors measure the weight of premature babies

6.Determine what type of study this is: In a study on cold symptoms the temperature of the participants in the study was taken This is an experimental study.

7.Determine which of the four levels of measurement (scales) is most appropriate. Biologists monitor the temperature of Biosphere 2 in Oracle, Arizona.

8.Determine the type of sampling used in this case. To get a sample of women who have suffered a problem with the machine in the gym, the researcher asks people who go to the gym if they have suffered any injuries.

9.Identify the type of study. The Department of Defense is studying the psychology of trauma. The behavior of the soldiers who died in Afghanistan will continue for the next 20 years.

Answer 1

1. These values come from a continuous data set. Continuous variables are numerical and are capable of taking an unlimited number of values.
2. This data is being measured at the interval scale. In this type of measurement, the order is known and the differences between the values are equal.
3. This is an example of systematic random sampling. Here, the sample is selected randomly from the population using a predetermined schedule or plan.
4. This is an example of simple random sampling. Here, the sample is chosen entirely based on chance.

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