A nutrition store in the mall is selling \"Memory Booster,\" which is a concocti

Question

A nutrition store in the mall is selling "Memory Booster," which is a concoction of herbs and minerals that is intended to improve memory performance. To test the effectiveness of the herbal mix, a researcher obtains a sample of n = 16 people and asks each person to take the suggested dosage each day for four weeks. At the end of the four-week period, each individual takes a standardized memory test. The scores from the sample produce a mean of M = 26 with SS = 960. In the general population, the standardized test is known to have a mean = 20. Do the sample data support the conclusion that the Memory Booster has a significant effect? Use a two-tailed test with alpha = 0.05. Compute Cohen's d to measure the size of the treatment effect. sM= df= t= reject null, "yes" or "no"? Cohen's d=

Explanation / Answer

What do you know?
n= 16
M=26
= 20
s2= 64
= .05
df=15
t table 2-tailed @ .05 is tcrit=±2.131

Sm= 64/16=2

t=26-20/2=6/2=3

tobs > tcrit so reject H0

S=64

Cohen's d =6/8=.75

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.