1. People with acrophobia (fear of heights) sometimes enroll in therapy sessions to help them overcome this fear. Typically, seven or eight therapy sessions are needed before improvement is noticed. A study was conducted to determine whether the drug D-cycloserine, used in combination with fewer therapy sessions, would help people with acrophobia overcome this fear. Each of 28 people who participated in the double-blind study received a pill before each of two therapy sessions. 14 of the 28 people were randomly assigned to receive a D-cycloserine pill, and the remaining 14 people received a placebo. After the two therapy sessions, none of the 28 people received additional pills or therapy. Three months after the administration of the pills and the two therapy sessions, each of the 28 people was evaluated to see if he or she had improved. a) Was this study an experiment or an observational study? Provide an explanation to support your answer. b) In this study, there was a group of individuals who received just a placebo which can be considered a control group. What would be the advantage of having this control group in the study? c) Suppose we knew that D-cycloserine had different effects between men and women. If we had 16 women

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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.