Mario is interested in finding out how committed individuals are to their current video streaming service. He posts a link to his survey on all of his social media platforms. Because he knows that younger people are more likely to use streaming video services than older people, he separates his population according to their age to create two groups (GROUP 1: 30 years old and younger; GROUP 2: 31 years old and older) and then randomly selects every 4th person from each group to complete his survey than older people. This is an example of which sampling method?

Data were collected on the number of home runs (HR) hit (x-variable) and the number of games won (y-variable) by a sample of Major League Baseball teams. The following Excel output was generated from the data:  Question: Don’t worry about Ho and Ha or the 7 steps, but using only the Excel output provided, is the number of home runs hit (HR) significantly related to team wins (α = .05)? Again, don’t worry about a formal test, but make sure you explain WHY you decided the HR variable is or is not significant, statistically speaking, and what that means. [Essentially, steps 6 and 7.]

A researcher considers two possible regression models to predict the number of crimes in cities. One uses the number of police in a city as a predictor. The other uses the average temperature in a city. Based on the two scatterplots below, which model (police or temperature) do you think will have a higher r-squared (r2)? Why?  

According to chapter 6, which of the following terms “tells a story by presenting events in an orderly, logical sequence”?

Match the following terms to their example sentences. 

What causes a greater amount of filtration to occur at glomeruli than at other capillary beds of the body?

Respiratory acidosis can be caused by all of the following:  (check all that apply)

What ion is at a higher concentration in the extracellular fluid than in the intracellular fluid?

The external urethral sphincter is __________ muscle.

What blood pH suggests alkalosis?