A sample of size 30 was taken from a very large population in order to estimate a proportion, p. The sample was found to have a proportion of p = 0.9. How many successes were found in this sample (hint: n•p)?

How many failures were found in this sample?

Can we use the apply the normal distribution to estimate p in this situation?
O Yes, the Z-normal distribution may be used.
O No, the Z-normal distribution may not be used.

Why or why not?
a. The population is not large enough for dependence
b. We have a large enough population for independence.
c. The number of successes or number of failures is less than 10.
d. The number of successes and number of failures is at least 10.
e. The sample size is at least 30.

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Will give brainliest b. describe the function over each part of its domain. state whether it is constant, increasing, or decreasing, and state the slope over each part.

I've been working on this for a few days and i just don't understand, it's due in a few hours. you. the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α. part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part b suppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case. part c now try a numerical problem. what is the direction of the vector w = < -1, 6 > ?