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A parcel service randomly selected 48 packages it received. The sample has a mean weight of 18.6 pounds. Assume that σ=3.2 pounds. Construct a 95% confidence interval for the true mean, μ, of all packages received by the parcel service.
Can you conclude that there is a higher proportion of U.S. companies offering high-deductible health insurance plans to their workers in 2006 than in 2005?
The period of the orbit is 2.3 hours. The radius of the planet is 4.34 × 106 m. What would be the true weight of the satellite if it were at rest on the planet's surface?
Two impendent samples of signs 9 and 8 gave the sum of squares of deviation from their respective means as 160 and 91 can the samples be regarded as drawn from the normal population with equal variance
one class of 40 students complain that they were harshly graded in the examination as l0 students received A or B ; 17 received a C ; and the rest received a D or lower. QUESTION: Is the class's complain about harsher grading justified? ( use a : 0..
The share of the national car manufcturers market in South Africa is shown in the table below:
Suppose among 312 large city residents sampled, 65 refused to cooperate. What is the margin of error at the 95% confidence level.
The following payoff matrix has been developed for the decision problem. What is the opportunity loss when "A" is Investment alternative and "Decline" is state of nature?
Why might a t test not be very useful in this case?
Given the following number of hours between breakdowns for 4 machines, are the machines significantly different? If so, how are they different? Which machine is the best?
Find the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 98 and 102.
Using your own experience, estimate the probability the local weather forecast is correct. Explain the rationale behind your estimate.
Research has shown that the people often see a correlation between two events when one does not really exist. Why do you think this happens?
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