Dr. Bean is doing a study on adolescent friendships. He has no initial theory; however, after interviewing the adolescents and collecting the data, he will look for patterns in the data so he can propose a theory of how adolescents form friendships. This is an example of

Which of the following would be the MOST HELPFUL strategy a researcher could use to find an article on a specific topic related to a subject in human development or family studies?

26-33. SHORT-ANSWER

22-25. Match the descriptions of the mode of inquiry with the term it BEST describes.

The operational definition refers to

Which of the following medications is most likely to be used to treat or stop an acute asthma attack?

Time series, cross-correlation, and ACF plots for series A and series B are below.  Both series exhibit possible periodicity, with period of about six months.

Suppose you know that data are coming from a stationary AR(3) process with mean 0, and you suspect  ρ ( 1 ) = 1 / 5 , ρ ( 2 ) = − 1 / 4 , and ρ ( 3 ) = 1 / 10. {“version”:”1.1″,”math”:”\rho(1) = 1/5, \;\; \rho(2)=-1/4,\;\;\;\textrm{and}\;\;\;\rho(3) = 1/10. “}Write/type the P matrix and the ρ{“version”:”1.1″,”math”:”ρ”} vector for the Yule-Walker equations, and use them to estimate the AR parameters ϕ1{“version”:”1.1″,”math”:”ϕ1″}, ϕ2{“version”:”1.1″,”math”:”ϕ2″}, and ϕ3{“version”:”1.1″,”math”:”ϕ3″}.

Consider the Markov chain whose one-step transition probability matrix is  What is the period of this Markov chain?

Time series, cross-correlation, and ACF plots for series A and series B are below.  The ACF plots indicate both series should be modeled as MA processes.