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 P.M. 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:
One Day
Refers to a period of 24 hours; often used in scheduling and planning to denote a specific calendar day.
Navigation Pane
A user interface element that displays the main areas or features of a software application or website, facilitating easy movement between sections.
Date Navigator
A calendar feature in scheduling applications that allows users to quickly jump to specific dates for event or task viewing.
Schedule View
A calendar-based layout in software applications that allows users to view events, tasks, or resources arranged by date and time.
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