INTERPRETATION INTERPRETATION What is the meaning of The confidence interval is

# Interpretation interpretation what is the meaning of

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INTERPRETATION
INTERPRETATION What is the meaning of ? The appropriate interpretation of a confidence interval (for example on ) is: The observed interval [ 11 . 93 85 . 87
MARGIN OF ERROR
MARGIN OF ERROR Error and margin of error In using to estimate the error must be less than or equal to with confidence 100(1- ) Error in estimating with . x x X x E ) / ( * 2 / n z B n z x l / 2 n z x u / 2
CALCULATING SAMPLE SIZE The sample size to establish a confidence interval of the form with confidence coefficient is given by EXAMPLE The yield of a chemical process is being studied. From previous experience yield is known to be normally distributed and σ = 3. The past five days of plant operation have resulted in the following percent yields: 91.6, 88.75, 90.8, 89.95, and 91.3. Based on this information, we want to determine how many more samples must be taken to ensure that the estimate is to be within 1 percent of the true average, with 95% CI?