Appendix B Data Sets STATDISK: Data set name is Coin Weights. Worksheet name is

Question

Appendix B Data Sets STATDISK: Data set name is Coin Weights. Worksheet name is COINS MTw Data Set 21: Coin Weights (grams) workbook name is COINS XLs. The pre-1983 pennies' were made after the Indian and wheat pen- Excel T-83/84 Plus: App name is coINS, and the file nies, and they are 97% copper and 3% zinc The "post-1983 pen- for text files. nies are 3% copper and 97% zinc. The pre-1964 silver quarters Text file names: Text file names are CPIND, CP HT are 90% silver and 10% copper. The post-196i quanen CPPST, CPCAN, CQPRE, OQPST with a copper-nickel alloy. Wheat Pennies Pre 19e3Pennies Prst-19 Pennies canadian Pennies Quarters Post 1964 Quarters Dollar Coins 55941 57247 79817 62412 6.1181 30185 30763 61787

Explanation / Answer

Ans: a)Independent events: Unrelated events; the outcome of one event does not impact the outcome of the other event.

As here ,we are just selecting the coin,not replacing,Number of indian pennies is still 5 after the event A,so it does not impact the probablity of coin selecting in another event.It will be independent of being selected in any other event.

b)P(A)=5/222=0.02252

P(B)=5/222=0.02252

When A and B are independent,P(A and B)=P(A).P(B)=0.02252*0.02252=0.000507

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