Economists are constantly tracking interest rates. The following data represent the fixed mortgage..

Economists are constantly tracking interest rates. The
following data represent the fixed mortgage rates offered by a large New York
bank on the first of each month from January 1, 1986 to March 1, 1988:

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Are interest rates declining over time? State Ho and Ha and
find the P-value.

Eight successive determinations of the salinity of a body of
water have been made:

2.33 2.24 2.29 2.20 2.18 2.25 2.19 2.15 Is the degree of
salinity decreasing over time? State Ho and Ha and calculate the P-value.