Suppose the U.S. president wants to estimate the proportion of the population that supports his current policy toward revisions in the health care system. The presi- dent wants the estimate to be within .04 of the true proportion. Assume a 95% level of confidence. The president's political advisors found a similar survey from two years ago that reported that 60% of people supported health care revisions. a. How large of a sample is requlred? b. How large of a sample would be necessary if no estimate were available for the proportion supporting current policy?
Angles in Circles
Angles within a circle are feasible to create with the help of different properties of the circle such as radii, tangents, and chords. The radius is the distance from the center of the circle to the circumference of the circle. A tangent is a line made perpendicular to the radius through its endpoint placed on the circle as well as the line drawn at right angles to a tangent across the point of contact when the circle passes through the center of the circle. The chord is a line segment with its endpoints on the circle. A secant line or secant is the infinite extension of the chord.
Arcs in Circles
A circular arc is the arc of a circle formed by two distinct points. It is a section or segment of the circumference of a circle. A straight line passing through the center connecting the two distinct ends of the arc is termed a semi-circular arc.
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