Approximately 21% of American adults smoke. To test this claim, a survey was conducted collecting data...
Approximately 21% of American adults smoke. To test this claim, a survey was conducted collecting data on 400 American adults and finds that 80 claim to smoke. Test at the .10 level of significance. What is the decision?
Homework Answers
Answer
Given that population proportion po = 0.21
sample proportion p(hat) = 80/400 = 0.2
sample size is n = 400
z test statistic
using z table, check -0.4 in the left most column and 0.09 in the top row, then select the inspecting cell, we get
p value = 0.6234
p value is insignificant because it is greater than the significance level of 0.10
DECISION:- Failed to reject Ho
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