day, the average temperature of the sea waters is "high". As doubts arose among

beachgoers, the temperature was recorded at the indicated time over 25 days and an

average temperature of 17 degrees was obtained with a corrected standard deviation

of 1 degree. It is known that the temperature of sea waters is normally distributed.

The)

a) Build a confidence interval for the true mean temperature value with a 99%

confidence level.

b) Build a confidence interval in which the true value of the standard deviation of the

temperature of the sea water is 95% confidence.