Author: Anonymous

The critical boundaries for a hypothesis test are z = +1.96 and -1.96. If the z-score for the sample mean is zM = +2.20, what is the correct statistical decision?

[Example continued…] The personality trait of “Conscientiousness” (someone who is organized, responsible, and can control their impulses) has μ = 120 and σ =9. Test whether ARC students (n = 9, M = 126) differ on Conscientiousness. α = .05. zM (z score for the sample mean) =

[example continued…] If the following scores are population data, [7,4,8,3,3] the Population Variance equals

[example continued…] A researcher is interested in understanding the smartphone habits of college students in the US. To answer this question, the researcher conducts an online survey of 1000 randomly selected college students from California. 77% of these students reported using their smartphones as soon as they wake up in the morning. If the goal of the study is to discover what percentage of college students in the US use their smartphones as soon as they wake up in the morning, that number would be an example of a _________.

[Example continued…] The average YouTube user spends 40 minutes per session, using YouTube (μ = 40), and σ is unknown. Test whether ARC students who are YouTube users (n = 16, M = 45, SS = 6000) differ from the average YouTube user on number of minutes spent using YouTube per session. α = .05. What is the correct result based on the data?

What is the value of ΣX2 for the scores 2, 5, 5, 3?

[Example continued…] The average YouTube user spends 40 minutes per session, using YouTube (μ = 40), and σ is unknown. Test whether ARC students who are YouTube users (n = 16, M = 45, SS = 6000) differ from the average YouTube user on number of minutes spent using YouTube per session. α = .05. SM =

[Example continued…] The personality trait of “Conscientiousness” (someone who is organized, responsible, and can control their impulses) has μ = 120 and σ =9. Test whether ARC students (n = 9, M = 126) differ on Conscientiousness. α = .05. Do ARC students differ on “Conscientiousness”?

[Example continued…] The average YouTube user spends 40 minutes per session, using YouTube (μ = 40), and σ is unknown. Test whether ARC students who are YouTube users (n = 16, M = 45, SS = 6000) differ from the average YouTube user on number of minutes spent using YouTube per session. α = .05. t =     (test statistic)

[example continued…] For a population with µ = 60 and σ = 20, the Sampling distribution of the Mean, based on n = 16 will have a standard error of the mean = ____