What z-scores bound the middle =NORMSINV(0.0250) 95% of the area? This is why the Empirical Rule says Rounded to and draw: a Normal Distribution, about “In 95% = 0.9500 shaded in middle 95% of the data lies within 2 Check: 1 0.9500 = 0.0500 not shaded standard deviations of the mean.” – Half of that is 0.0250 0.0250 in the left tail 0.0250 in the right tail Answer: to Or to What z-scores bound the middle =NORMSINV(0.0015) 99.7% of the area? This is why the Empirical Rule says a Normal Distribution, about Check: “In and draw: 95% of the data lies within 2 99.7% = 0.9970 standard deviations of the mean.” 1 0.9970 = 0.0030 Check Empircal Rule’s rounded – Half of that is 0.0015 value of : 0.0015 in the left tail 0.0015 in the right tail Answer: to Or to
What z-scores bound the middle 95% of the area? and draw: 95% = 0.9500 shaded in middle 1 – 0.9500 = 0.0500 not shaded Half of that is 0.0250 0.0250 in the left tail 0.0250 in the right tail Answer: to Or to This is why the Empirical Rule says “In a Normal Distribution, about 95% of the data lies within 2 standard deviations of the mean.” Rounded to Check: =NORMSINV(0.0250) What z-scores bound the middle 99.7% of the area? and draw: 99.7% = 0.9970 1 – 0.9970 = 0.0030 Half of that is 0.0015 0.0015 in the left tail 0.0015 in the right tail Answer: to Or to This is why the Empirical Rule says “In a Normal Distribution, about 95% of the data lies within 2 standard deviations of the mean.” Check: Check Empircal Rule’s rounded value of : =NORMSINV(0.0015)
TI84_and_Excel.docx