f4)You measure 48 textbooks' weights, and find they have a mean weight of 33 ounces. Assume the population standard deviation is 6.4 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight.

f6)Use the data values in the table below to calculate the correlation, r, between the variables x and y.

x	y
1	20.85
2	22.3
3	22.35
4	21.6
5	21.35
6	20.4

Give your answer to rounded three decimal places.