Question 5 A study of nickels showed that the the standard deviation of the weig

Question

Question 5 A study of nickels showed that the the standard deviation of the weight of nickels is 150 milligrams. A coin counter manufacturer wishes to f confidence interval for the average weight of a nickel. How many nickels does he need to weigh to obtain an average accurate to within 20 milligrams? 154 57 306 A study was conducted to determine if there was a relationship between the prices a son menber of a book club paid for various publications and the that a member paid for the same publicationshown below Ct te ve ofion cofident is shown below, Compute the value of 42 32 19 48 o0.762 0.857 0.932 0.679

Explanation / Answer

Solution5:

population stdd ev=150

margin of error=E=20mg

Z crit for 95%=1.96

smaple size=n=Z^2*sigma^2/E^2

=1.96^2*150^2/20^2

=216.09

=217

n=217

OPTIOND

Solution6:

code in R:

nonmemberprice <- c(58,42,46,32,25,75,35,63)
memberprice <- c(32,22,20,16,19,58,34,48)
cor(nonmemberprice,memberprice)

output:

0.8571338

r=0.857

correlation coefficient=0.857

there exists a strong relationship between nonmenmber price and member price

OPTIONB

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