A fast food restaurant executive wishes to know how many fast food meals teenage

Question

A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. They want to construct an 80% confidence interval with an error of no more than 0.07 a consultant had been informed them that a previous study has found the mean to be 5.8 fast food meals per week and found the standard deviation to be 1.3. What is the minimum sample size required to create the specified confidence interval ? A fast food restaurant executive wishes to know how many fast food meals teenagers eat each week. They want to construct an 80% confidence interval with an error of no more than 0.07 a consultant had been informed them that a previous study has found the mean to be 5.8 fast food meals per week and found the standard deviation to be 1.3. What is the minimum sample size required to create the specified confidence interval ?

Explanation / Answer

using formla

n = (Z * sigma / error) ^2

error = 0.07

alpha / 2= 0.10 Z= 1.28

n = ( 1.28 * 1.3 / 0.07 ) ^2

n =565.08

n= 566

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