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Question: Timber! A lumber company wants to estimate the proportion of trees in a large forest that are ready to be cut down. They use an aerial map to divide the forest into 200 equal-sized rectangles. Then they choose a random sample of 20 rectangles and examine every tree that's in one of those rectangles.
(a) What is the name for this kind of sampling method?
(b) Give a possible reason why the lumber company chose this method.
Physical Sciences The well depth in certain locations is important for agriculture and for the development and maintenance of residential and commercial areas.
the diameters of grapefruits in a certain orchard are normally distributed with a mean of 5.96 inches and a standard
1. (Continuation.) If g is a function from X into S, then t is called the Pettis integral of g if for all u ∈ St, ( u(g) dµ = u(t ). Show that the Bochner integral of g, when it exists, as defined in Problem 1, is also the Pettis integral.
Choose and make data displays. Describe the shapes of the samples and how they differ.- Perform a t test to compare the population mean repair times. Give hypotheses, the test statistic, and the P-value.
assume that a simple random sample has been selected from a normally distributed population and test the given claim.
Write the null and alternative hypotheses
1. A simple random sample of 100 batteries is selected from a process which produces the batteries with a mean life of 40 months and a standard deviation of 2 months. Thus, the standard error equals .2 when n=100. If a sample size of n=1600 had be..
What z-score bounds middle 95 % of the normal distribution and what z-score is associated with 75th percentile?
Solve for the following items: The point on the x-axis that is equidistant (equal distance)from (10,4) and (6,2).
List all possible combinations of opinions that can be held by students A, B, and C. (Hint: There are eight possibilities.) Then give the probability of each of these outcomes. Note that they are not equally likely.
Fire Eye (www.fireeye.com) is one of the world's most effective private cybercrime fighters. The company defends corporations and governments against targeted malicious software. Fire Eye's clients include Fortune 500 companies and members of the ..
Cold calls. Justine works for an organization committed to raising money for Alzheimer s research. From past experience, the organization knows that about 20%.
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