Suppose a drug for stomach discomfort is tested on 75 subjects, and the mean time for it to take effect on these 75 subjects is 200 seconds, with a population standard deviation of 30 seconds. (a) What is the 95% confidence interval for the (population) mean amount of time it will take effect on a person from that given population? (b) What about the 99% confidence interval?
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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