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Because of inadequate public school budgets and lack of money

Because of inadequate public school budgets and lack of money available to teachers for classroom materials, many teachers often use their own money to buy materials used in the classrooms. A random sample of 100 public school teachers selected from an eastern state showed that they spent an average of $290 of their own money on such materials during the 2011–2012 school year. The population standard deviation was $70.

a. What is the point estimate of the mean of such expenses incurred during the 2011–2012 school year by all public school teachers in this state?

b. Make a 95% confidence interval for the corresponding population mean.

a. What is the point estimate of the mean of such expenses incurred during the 2011–2012 school year by all public school teachers in this state?

b. Make a 95% confidence interval for the corresponding population mean.

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