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1. The ideal estimator of location would have a smaller standard error than any other estimator we might use. Explain why such an estimator does not exist.
2. Under normality, the sample mean has a smaller standard error than the trimmed mean or median. If observations are sampled from a distribution that appears to be normal, does this suggest that the mean should be preferred over the trimmed mean and median?
there are 7 guards and 6 centers trying out for the starting 5 in a basketball team with specific positions. find the
the mean and standard deviation of the lifetime of a battery in a portable computer are 3.5 and 1.0 hours
Neither married nor a college graduate? (answer should be a probability, that is, a number between 0 and 1). Married but not a college graduate? (answer should be a probability, that is, a number between 0 and 1).
write about the use of hypothesis testing in the context of your life or business. provide a real-world case example of
1.a manufacturer receives parts from two suppliers. an srs of 400 parts from supplier 1 finds 20 defective. an srs of
A car salesmen claims that a particular make of a car would give a mean mileage of greater than 20mpg. If I ran 10 cars on one gallon of gas each and came up with 10 different results, what statistical formula would I use to support the salesmen c..
According to Fortune, solar power now accounts for only 1% of total energy produced.15 If this number was obtained based on a random sample of 8,000 electricity users, give a 95% con?dence interval for the proportion of users of solar energy.
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
question the manufacturer of a steel-belted radial tire claims that the mean mileage the tire can be driven before the
Find the power of the test to determine if the the new cream is effective, when the mean percent weight reduction is actually 2.4%. Assume that the population standard deviation is 7% and that the significance level is α=0.03.
A stone of mass m is placed at the center of the cord, which is pulled back a distance 3a/4 and then released from rest. Find the speed with which the stone is projected by the catapult.
objects with masses m1 12.0 kg and m2 8.0 kg are connected by a light string that passes over a frictionless pulley
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