What is the denominator in the one sample t test formula?

Locus of Control has μ = 106 and σ =12. Test whether ARC students (n = 36, M = 109) differ on Locus of Control.  α = .05.  What type of error could you be making?

A class consists of 20 psyc majors, 20 nursing majors, and 10 social work majors.  If one student is randomly selected from the class, what is the probability that the student is a social work major  p(social work major)?

A normal distribution has a mean of µ = 12 with σ = 3.  What is the probability of a score greater than  15 from this distribution, p(X > 15)?

If the following scores are population data, the Population Variance equals

What is the x score for z =+3.00, μ = 40, σ = 3?

Liam’s  Test                                                 Emma’s Test   Liam’s Score: 90                                          Emma’s Score: 93 Class Average: 84                                       Class Average: 85 Standard Deviation: 2.5                               Standard Deviation: 4   Convert Liam’s score into a score on Emma’s test: 

I’m interested in whether the playing of prosocial video games in children influences helping behavior.  To answer this question, I randomly assign children into 3 conditions: In Condition 1, children are given a prosocial video game to play (Prosocial Video Game condition), in Condition 2, children are given a violent video game to play (Violent video game condition), and in Condition 3, children are not given any video games to play (No video game condition).  Afterwards, I measure their helping behavior. In this example, one of the conditions is

A researcher is interested in understanding the social media habits of college students in California. To answer this question, the researcher conducts an online survey of 500 college students in the Sacramento Region. On average they spend 6 hours a week on social media.   In this example, the 6 hours a week reported by the college students in the Sacramento Region is an example of a _________.

If the following scores are sample data,  the Sample Standard Deviation equals