49. Egyptian researchers, Kamal et al. (1991), took a sample of 126 police officers subject to inhalation of vehicle exhaust in downtown Cairo and found an average blood level concentration of lead equal to 29.2 μg/dl with a standard deviation of 7.5 ug/dl. A sample of 50 policemen from a suburb, Abbasia, had an average concentration of 18.2 μg/dl and a standard deviation of 5.8 μg/dl. Form a confi- dence interval for the population difference and test the null hypothesis that there is no difference in the populations.
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.
11.49 question attached. Thank you for answering my question!
Step by step
Solved in 3 steps with 2 images
