(Answered) Please provide a 250-300 word explanation for the below

Statistics

Please provide a 250-300 word explanation for the below discussion questions and please include APA style in-text quotation marks, citations, and references!!

Q1. In correlation and regression we are examining relationships between two or more variables (i.e., ad spending and sales). However in most studies we do we cannot say that one variable (ad spending) causes the other (sales). Why not? What has to be the case for us to discuss one variable "causing" another?

Q2. What is the difference between a t-test and Chi-square test? What does each do? When you we use each?

Q3. Explain the concepts of reliability and validity. Why are they important to research and statistics? How do we measure each of these? What happens if the questionnaire we use is determined to not be reliable or valid?

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