Question: Is this 2-Tail test? Or 1-Tail test? In this case what I use for H0? I know the standard deviation, what number represent The mean

Is this 2-Tail test? Or 1-Tail test? In this case what I use for H0? I know the standard deviation, what number represent The mean in the equation is it 1955? Or 1800?

For the Bank the average savings account balance in year 2008 was $1800.

A random sample of 30 savings account balances for the year 2009 yielded a mean of $1955 and a standard deviations of $123.

At a = 0.05significance level can we conclude that in 2009 the mean savings account balance differs from the mean savings account balance in 2008?

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