Question

20.

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 deviations. (Round your answers to one decimal place) 

(b) Compute a 98% confidence interval for the mean depth at which archaeological artifacts from the Wind Mountain excavation site can be found. (Round your answers to one decimal place.) 

21. 

A research group conducted an extensive survey of 2896 wage and salaried workers on issues ranging from relationships with their bosses to household chores. The data were gathered through hour-long telephone interviews with a nationally representative sample. In response to the question, "What does success mean to you?" 15:7 responded, "Personal satisfaction from doing a good job." Let o be the population proportion of all wage and salaried workers who would respond the same way to the stated question. Find a 90% confidence interval for P. (Round your answers to three decimal places.) 

Answer 1