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If a hypothesis test produces a z score in the critical region, what decision should be made?

If a study finds that there is a correlation between volunteering behavior and the personality trait of Extroversion, it means that volunteering causes Extroversion.  True or False?

[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. The critical t score boundaries =

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)