14.The president of cross country runners in South Carolina wanted to estimate the true proportion, at a 90% confidence, the proportion of all high school cross ountry runners in SC
that run under a five minute mile. A random sample of 80 runners was taken and it was found
that 60 (75% of the sample) can run under a five minute mile. Help the president
a. Construct a 90% confidence interval for this situation.
b. What would happen to the interval if I changed the confidence level to 80%? May help to
be specific

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Asap time is ! best answer gets compose at least one well-developed paragraph on the following: define the term concurrent powers, and give an example of a concurrent power of government.

Acar moves a distance of 50.0 km west, followed by a distance of 64.9 km north what was the magnitude of the displacement of the car, in units of kilometers?