what degrees of freedom will use to develop a 99 % confidence interval estinate of the mean number of days it takes to transfer money to a foreign supplier in Romania?

The Business Environment and Enterprise Performance Survey (BEEPS), developed by the European Bank for Reconstruction and Development and the World Bank, is a survey of more than 4,000 firms in 22 transition countries. Conducted in 2000, BEEPS gathered information on the impediments to business growth in transition countries. As part of BEEPS, firms answered the question, “How many days does it take to transfer money through the financial system to a supplier in another country?” For the sample of 36 firms in Romania, the sample mean a was 8.5 days, and the sample standard deviation s was 6.6 days. The standard deviation of the population distribution is unknown, but you are willing to assume that the population distribution is not highly skewed and contains no outliers.

a. what degrees of freedom will use to develop a 99 % confidence interval estinate of the mean number of days it takes to transfer money to a foreign supplier in Romania?

b. Compute and interpret a 99% confidence interval estimate for the mean number of days it takes to transfer money to a foreign supplier in Romania.

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