The Wind Mountain archaeological site is located in southwestern New Mexico. Wind Mountain was home to an ancient culture of prehistoric Native Americans called Anasazi. A random sample of excavations at Wind Mountain gave the following depths (in centimeters) from present-day surface grade to the location of significant archaeological artifacts†.
85 | 45 | 120 | 80 | 75 | 55 | 65 | 60 |
65 | 95 | 90 | 70 | 75 | 65 | 68 |
(a) Use a calculator with mean and sample standard deviation keys to find the sample mean x and sample standard deviation s. (Round your answers to one decimal place.)
x = | cm |
s = | cm |
(b) Compute a 95% confidence interval for the mean depth μ
at which archaeological artifacts from the Wind Mountain excavation
site can be found. (Round your answers to one decimal place.)
lower limit | cm |
upper limit | cm |
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