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A one sample t test has n = 20. If using a two-tail test (proportion in two tails combined) with an alpha = .05, the critical t score boundaries =

A vertical line drawn through a normal distribution at z = +0.99 separates the distribution into two sections, the body and the tail. What proportion of the distribution is in the body?

[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. What is the correct result based on the data?

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 =