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How many city residents must be surveyed in order to have a 95 percent confidence interval with a precision of plus/minus 3 trips per month. A pilot study found that the standard deviation was 14 trips.
Suppose that we generate a random sample from a given distribution. If it is desired that the probability that the sample mean will be within 2 standard deviations of the mean of the distribution is at least .99, how large should the sample size b..
Paul has calculated the indifference probability for the lottery having a payoff of $160K with probability p and -$80K with probability (1-p) as follows:
If a new graduate is given a bunch of flowers from this outlet, what is the probability that the flowers were purchased by their partner or friend?
The newspaper has charged that your police department responds more slowly to 911 calls in poor neighborhoods than in more wealthy ones.
What is the level of measurement for the variable, "political ideology" measured as "Very Conservative", "Conservative","Moderate", "Liberal" and "Very Liberal".
12 mature citrus trees of one variety and 15 of another gave means and standard deviations of their heights as 13.8 and 12.9 ft (means), and 1.2 and 1.5 ft (standard deviations).
Estimated the probability that among 75 randomly selected students, at least 20 of them score greater than 78.
Post a message in the Discussion area that answers the following question. Do you think the person has ESP or can their success ratio be attributed to chance variation?
Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
Suppose that past data are not available for developing a planning value for p; therefore, you will use p = 0.050 for the planning average.
use the normal approximation to the binomial to determine what is the probability that: 100 or more murder are committed with a firearm? a. 0.452 b. 0.548 c. 0.367 d. 0.164.
What is the null and alternative hypothesis? What is your final conclusion?
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