Exercise 15 “Testing for Median Weight of Quarters”

Refer to the sample data from the given exercises in Section 13-2 on page 611. Use the Wilcoxon signed-ranks test for the claim about the median of a population.

Data From Exercise 15 Section 13-2:

Refer to Data Set 29 “Coin Weights” in Appendix B for the weights (g) of randomly selected quarters that were minted after 1964. The quarters are supposed to have a median weight of 5.670 g. Use a 0.01 significance level to test the claim that the median is equal to 5.670 g. Do quarters appear to be minted according to specifications?

Refer to the indicated data set in Appendix B and use the sign test for the claim about the median of a population.

Data Set 29: Coin Weights

Data are from 222 coins (first five rows shown here) consisting of coin weights (grams). The “pre-1983 pennies” were made after the Indian and wheat pennies, and they are 97% copper and 3% zinc. The “post-1983 pennies” are 3% copper and 97% zinc. The “pre-1964 silver quarters” are 90% silver and 10% copper. The “post-1964 quarters” are made with a copper-nickel alloy.