Question

In: Statistics and Probability

Dr. John is studying differences in the effectiveness of three new medications for statsphobia. Statsphobia is the...

Dr. John is studying differences in the effectiveness of three new medications for statsphobia. Statsphobia is the fear rating measure for psy221. He randomly assigns subjects to take one of the three medications (6 subjects per group). Below are the data. Is there a significant difference in statsphobia when comparing the three medications? Use α = .05.

Medication A Medication B Medication C

ΣX₁= 30 ΣX₂= 9 ΣX₃= 6

ΣX²₁ = 154 ΣX²₂ = 23 ΣX²₃= 18

a) State the null and alternative hypotheses in words. (2 point)

Q20: Null

Q21: Alternative

b) Set up the criteria for making a decision. That is, find the critical value(s).

(1 point)

Q22: Critical value in proper format

c) Calculate the appropriate test statistic and complete the table below.

Show your work! (7 points)

Q23: df-Group

Q24: df-Error

Q25: df Total

Q26: SS-Group

Q27: SS-Error

Q28: SS-Total

Q29: MS-Group; MS-Error; F-obtained

Source	SS	df	MS	F
Between (group)
Within (error)
Total

d) Evaluate the Null: (circle one): REJECT FAIL TO REJECT (1 point)

Q30: Evaluate:

e) Interpret your results in words. (What conclusion can you draw) (1 point)

Q31: Conclude in words

f) Calculate the magnitude of effect using eta-squared.

(1 point)

Q32: eta-squared equals

g) Interpret your results from the last question (f) specific to the study in problem #4. (1 point)

Q33: Interpret in words

Expert Solution

orchestra answered 2 years ago

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