#12 Normal Curve: Tree Rings Tree rings dates were used extensively in archaeologicalstudies. At one site on the mesa, tree ring dates gave a mean date of µ1 = year 1272 withstandard deviation o1 = 35 years. At a second site the tree ring dates gave a mean uz= year 1122 with standard deviation o2 = 40 years. Assume that both sites had dates thatwere approximately normally distributed. In the first area, an object was found and dated as x1= year 1250. In the second area, another object was found and dated as x2 = year 1234.(a) Convert both x¡ and x2 values to z values, and locate both of these values under thestandard normal curve.(b) Which of these two items is the more unusual as an archaeological find in its location?

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Answered: (a) Convert both x¡ and x2 values to z…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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QUESTION 4 According to previous research, the mean amount of money spent on gifts for the holiday season by aworking adult is $1500. With the current prices in Trickidad, a young researcher believes that thisamount has been increased.She takes a random sample of 60 working adults and collects data on the amount of money they havespent on gifts for the current holiday season, giving a mean of $1650.Assume that the population standard deviation for the amount of money spent on gifts for the holidayseason by a working adult is $150 and that this amount of spending is normally distributed.(a) Construct a 95% confidence level for the mean amount of money spent on gifts for the holidayseason by a working adult. Interpret your answer. (b) Is there any evidence at 5% level of significance to suggest that the mean amount of moneyspent on gifts for the holiday season by a working adult has increased? Use the critical valueapproach in arriving at your conclusion showing clearly all the required…
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(a) Convert both x¡ and x2 values to z values, and locate both of these values under the standard normal curve. (b) Which of these two items is the more unusual as an archaeological find in its location?