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Question: Repeat Exercise using a randomization mechanism that ensures that each group will end up with exactly five people.
Exercise: Write down the names and ages of 10 people. Using coin flips, divide them into two groups, as if for a randomized experiment. Did one group tend to get many of the older subjects? Was there any way to predict which group would have a higher average age in advance of the coin flips?
Repeating this experiment many times with different samples, what values for the sample means would be possible? What values would repeat more often?
Find out the sample size raised by mean also standard deviation, a sampling distribution may approach among which of the following values.
A die is rolled twice. Let X denote the sum of the two numbers that turn up, and Y the difference of the numbers (specifically, the number on the first roll minus the number on the second). Show that E(XY ) = E(X)E(Y ). Are X and Y independent?
Find the conditional distributions (percentages) of political views for the males.- Make a graphical display that compares the two distributions.
Find out the probability distribution, and the cumulative probability distribution of car arrivals.
A population mean on a math section of the SAT is 500 and the sd=100. 400 students are taking the SAT and their families income was 70,000 and 80,000
Describe what happens when the sample standard deviations get smaller and discuss the effects of decreasing the sample size
a. What is the probability that the number of items produced is at most 120? b. What is the probability that at least 125 items are produced? c. What is the probability that between 135 and 160 (inclusive) items are produced?
The issue of how much should be spent to solve particular U.S. social problems is a complex matter, and people have diverse and conflicting ideas on these issues.
Suppose that two teams are playing a series of games, each of which is independently won by team A with probability p and by team B with probability 1-p. The winner of the series is the ?rst team to win four games. Find the expected number of game..
A Federal funding program is available to low income neighborhoods. To qualify for the funding a neighborhood must have a mean household income of less then $15,000 per year.
As a sample of radioactive atoms decays, the number of atoms steadily diminishes and the sample's radioactivity decreases in proportion.
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