# Question: 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.

**View Solution:**## Answer to relevant Questions

A bank manager wants to know the mean amount owed on credit card accounts that become delinquent. A random sample of 100 delinquent credit card accounts taken by the manager produced a mean amount owed on these accounts ...Dr. Garcia estimated the mean stress score before a statistics test for a random sample of 25 students. She found the mean and standard deviation for this sample to be 7.1 (on a scale of 1 to 10) and 1.2, respectively. She ...Briefly explain the meaning of each of the following terms. a. Null hypothesis b. Alternative hypothesis c. Critical point(s) d. Significance level e. Non-rejection region f. Rejection region g. Tails of a test h. Two types ...According to an estimate, the average age at first marriage for men in the United States was 28.2 years in 2010 (Time, March 21, 2011). A recent sample of 200 men from Ohio who got married for the first time this year showed ...A company claims that its 8-ounce low-fat yogurt cups contain, on average, at most 150 calories per cup. A consumer agency wanted to check whether or not this claim is true. A random sample of 10 such cups produced the ...Post your question