1. Identify the level of measurement used to measure the following variables: a. Postal zip code b. Student number c. Ranking of students in a class d. Annual salary of employee e. Classification of heavy equipment as bulldozer, excavator, loader and roller
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
![1. Identify the level of measurement used to
measure the following variables:
a. Postal zip code
b. Student number
c. Ranking of students in a class
d. Annual salary of employee
e. Classification of heavy equipment as
bulldozer, excavator, loader and roller
2. Classify each of the following as a survey,
an experiment, or an observation. Provide
a brief explanation for your answer.
a. A local TV network asked voters to
indicate whom they voted as they exited
the polling booth.
b. The
school
administration
asked
students whether they are willing to have
an increase in laboratory fees if there is
an upgrade of computers.
c. A private hospital divides terminally ill
patients into two groups, with one group
receiving better medication
other group receiving medication B. After
a month, they measured each subject's
and the
improvement.
3. Write a questionnaire to measure political
awareness of students. Incorporate topics
on the students political thinking and
preferences. Put questions regarding
personal characteristics of students like
year, sex, course, and others. Include a
maximum of 15 questions only. Keep in
mind the guidelines on questionnaire
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