zα/2 = z0.025 = 1.96 , using a calculator, computer or a Standard Normal probability table. Using the TI83, TI83+ or TI84+ calculator: = 1.96 invNorm(0.975,0,1) CALCULATOR NOTE: Remember to use area to the LEFT of zα/2; in this chapter the last two inputs in the invNorm command are 0,1 because you are using a Standard Normal Distribution Z~N(0,1) EBM: Error Bound The error bound formula for an unknown population mean when the population standard deviation is known is μ σ EBM= zα/2 ⋅
zα/2 = z0.025 = 1.96 , using a calculator, computer or a Standard Normal probability table. Using the TI83, TI83+ or TI84+ calculator: invNorm(0.975,0,1) = 1.96 CALCULATOR NOTE: Remember to use area to the LEFT of zα/2; in this chapter the last two inputs in the invNorm command are 0,1 because you are using a Standard Normal Distribution Z~N(0,1) EBM: Error Bound The error bound formula for an unknown population mean μ when the population standard deviation σ is known is EBM= zα/2 ⋅
ch8_confidenceintervalsdknown.docx