The method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution. 1,2711,1801,1871,2431,2681,3161,2751,3171,275 (a) Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviation s. (Round your answers to four decimal places.) x = A.D.s = yr (b) Find a 90% confidence interval for the mean of all tree ring dates from this archaeological site. (Round your answers to the nearest whole number.) lower limit A.D.upper limit A.D.

find population sd   12,15,18,16,19,22,23,25,28

Find the area of the part of the plane x + 4, y + z = 4 that lies in the first octant. 1. A = 12 2. A = 6V2

Calculate Sam’s GPA and Samantha’s.

Assuming a population of interest is approximately normally distributed, construct a 95% confidence interval estimate for the population mean given the following values: Sample mean = 30; %3| Sample standard deviation =3.5; Sample size =15

Calculate zo.062-