1. 1/11 points | Previous Answers MintroStat6 7.E.063 My Notes Ask Your Teach A

Question

1. 1/11 points | Previous Answers MintroStat6 7.E.063 My Notes Ask Your Teach A multimedia program designed to improve dietary behavior among low-income women was evaluated by comparing women who were randomly assigned to intervention and control groups. The intervention was a 30-minute session in a computer kiosk in the Food Stamp office. One of the outcomes was the score on a knowledge test taken about 2 months after the program. Here is a summary of the data: Group Intervention 161 5.18 1.15 Control 216 4.27 1.16

Explanation / Answer

The statistical software output for this problem is:

Two sample T summary hypothesis test:
1 : Mean of Population 1
2 : Mean of Population 2
1 - 2 : Difference between two means
H0 : 1 - 2 = 0
HA : 1 - 2 > 0
(without pooled variances)

Hypothesis test results:

95% confidence interval results:

Hence,

d) t = 7.571

Df = 346

P = 0

Reject Ho; Option A

e) 95% CI:

(0.67, 1.15)

f) Option B

Difference Sample Diff. Std. Err. DF T-Stat P-value 1 - 2 0.91 0.12018284 346.42981 7.5717964 <0.0001

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