When the results of a survey or poll arepublished, the sample size and the margi

Question

When the results of a survey or poll arepublished, the sample size and the margin of error are bothgiven. In this example N=1000 and the margin of error (MoE)is 3%. What isn't given is the confidence interval of 90%,95%, or 99%? Does it matter? A confidence interval of 95% is mostcommonly used when reporting survey results.

Gallup Poll. July 7-10, 2005.N=1,006 adults nationwide. MoE ± 3.

.

"Do you feel confident or notconfident that the food available at most grocery stores is safe toeat?"

.

7/7-10/05

7/8-11/04

7/9-11/02

7/19-22/01

.

Gallup Poll. July 7-10, 2005.N=1,006 adults nationwide. MoE ± 3.

.

"Do you feel confident or notconfident that the food available at most grocery stores is safe toeat?"

.

Confident Not
Confident Unsure % % %

7/7-10/05

88 12 -

7/8-11/04

87 12 1

7/9-11/02

85 13 2

7/19-22/01

89 10 1

.

Explanation / Answer

Gallup Poll. July 7-10, 2005. N=1,006adults nationwide. MoE ± 3.

.

"Do you feel confident or not confidentthat the food available at most grocery stores is safe toeat?"

.

7/7-10/05

7/8-11/04

7/9-11/02

7/19-22/01

Gallup Poll. July 7-10, 2005. N=1,006adults nationwide. MoE ± 3.

.

"Do you feel confident or not confidentthat the food available at most grocery stores is safe toeat?"

.

Confident Not
Confident Unsure



% % %

7/7-10/05

88 12 -

7/8-11/04

87 12 1

7/9-11/02

85 13 2

7/19-22/01

89 10 1

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