Question

Question Help ure and brane Str the end o 1224 The state test scores for 12 randomly selected high school 1420 seniors are shown on the right. Complete parts (a) 691720 through (c) below. 730 744 Assume the population is normally distributed. 624 1448 984 838 545 950 ESS tod edit Service (a) Find the sample mean. x= (Round to one decimal place as needed.) (b) Find the sample standard deviation. s= (Round to one decimal place as needed.) 5732 2808 (c) Construct a 99% confidence interval for the population mean . 5732 Immuniza Entor sour answer in each of the answer boxes.

Answer 1

2 Xi Exi ZX 10918 10918 12 = x EEE8.bob 48.606 81 = x 18.606 Sumple standard deviation = s= {(xi*X) 2 n=18 I Cxi - x)² (1420 - gog. 8)² + ... n annt - t... ( 95o-gog.88. 1019437.6667 ) s²2 92676.1515 s J9 2676.1515 S: 304.427 Is = 304.4

99% error u is (at tale ) ( 909 9 + 3.106 ( 3044 x Hema) dif 4 (n-1) de > 5 (909.8 + 3.106 ( 87-88)) ( 809.8 + 3.106 ( 87.87) (909.8 + 272.92) ( 636-88 , 1132072)