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

What is the correct conclusion based on the following one sample t test result [t(22) = 4.25, p < .05]

[Example continued…] The average Instagram user spends 30 minutes per day using Instagram (μ = 30), and σ is unknown. Test whether ARC students who are Instagram users (n = 25, M = 24, SS = 2400) differ from the average Instagram user on number of minutes spent using Instagram per day. α = .05. SM =

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 is the null hypothesis (H0)  

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)?

For the following data: [µ = 120, σ = 25, n = 25, M = 125], σM = = ____.

[Example continued…] Locus of Control has μ = 106 and σ =12. Test whether ARC students (n = 36, M = 109) differ on Locus of Control.  α = .05.  σM =

[Example continued…] 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?

[example continued…] A normal distribution has a mean of µ = 50 with σ = 10. If a vertical line is drawn through the distribution at X = 55, what proportion of the scores are on the right side of the line?

[example continued…] If the following scores are population data, [6,6,7,3,5,3] the Population Variance equals