Question

Name Date Points indicated in l's Confidence Interval Activities 1. a. Draw the standard normal curve and shade the area corresponding to the middle 90% of the standard normal distribution. Determine the values-z and z such that the area under the standard normal curve between-z and z is equal to 0.90. Round the z-values to the nearest thousandth. [(4) אto ,י +0100enor m C.9s,0,1)=045 .go .oS 210.5.0 -\.045 -2 b. Repeat part (a) for the middle 95% of the distribution. [4] Repeat part (a) for the middle 99% of the distribution. [4] c. Repeat part (a) for the middle 99.9% of the distribution. [4] d.

Answer 1

solution: (b) 10.95 1 0.025 0.025 cal -1.96 196 th=1.960 S R Z-Scores - h = -1.960 Ito = 2.576 -hoa-2.576 0.99 Oooos 0.005 -2.576 2.576 o.ggg -3.29) T 3.29) tho = 3.29) to : -3.291 (a e Percentage Arca | gol 9st. gg.. 99.9%. 3.291 1 1.645 n 1.960 2.576 # As we keep on increasing the percentage of Area im middle of standard mosmal distribution. 2. sore will keep on increasing,