# Statistics

A bank wishes to estimate the mean balances owed by their MasterCard customers within \$75. The population standard deviation is estimated to be \$300. If a 98% confidence interval is used, how many cardholders should be sample.

Please provide sample size formula in calcutions.

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1. The Roper Organization conducted identical surveys in 1990 and 2000. One question asked
women was, “Are most men basically kind, gentle, and thoughtful?” The 1990 survey revealed
that, of the 3,000 women surveyed, 2,010 said that they were. In 2000, 1,530 of the 3,000 women
surveyed thought that men were kind, gentle, and thoughtful. At the .05 level, can we conclude
that women think men are less kind, gentle, and thoughtful in 2000 compared with 1990?

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posted by jenny

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