A PTA group wishes to determine whether a barrage of letters sent to the local station has reduced the amount of violence broadcast between the hours of 4 and 9 P.M. The results of a survey of viewers are given here. 
Carry out a sign test to determine whether or not the letters were effective in reducing the amount of violence during the 4 to 9 p.m. period. Use a .05 level of significance. Be sure to state the null and alternative hypotheses.
Definitions:
Slope
The measure of steepness or incline of a line, indicating the rate of change between two variables.
Continually Changing
Describes a state of constant evolution or modification, not remaining static.
Variable on the Vertical Axis
Refers to the dependent variable in a graph or chart, plotted along the vertical (Y) axis, whose value depends on the independent variable.
Variable on the Horizontal Axis
In data representation, a quantity that is measured along the horizontal axis, usually independent in nature.
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