Recent years have also seen an increase in the use of
ATM machines. When Mr. Selig took over the bank, the
mean number of transactions per month per customer was
8; now he believes it has increased to more than 10. In fact,
the advertising agency that prepares TV commercials for
Century would like to use this on the new commercial being
designed. Is there sufficient evidence to conclude that
the mean number of transactions per customer is more than
10 per month? Could the advertising agency say the mean
is more than 9 per month?
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