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In each of the following situations, is the alternative hypothesis one-sided or two-sided? What are the hypotheses?
a) A college dining service wants to know if students prefer plastic or metal cutlery. They conduct a survey to find out.
b) In recent years, 10% of college juniors have applied for study abroad. The dean s office conducts a survey to see if that s changed this year.
c) A pharmaceutical company conducts a clinical trial to see if more patients who take a new drug experience headache relief than the 22% who claimed relief after taking the placebo.
d) At a small computer peripherals company, only 60% of the hard drives produced passed all their performance tests the first time. Management recently invested a lot of resources into the production system and now conducts a test to see if it helped.
Which cities tend to receive higher rankings-those north or south of the equator?- Are the livability rankings related to a city's economic status (assessed by rank)?
A cognitive psycholgist believes that a particular drug improves short-term memory. The drug is safe, with no side effects. An experiment is conducted in which 8 ramdomly selected subjects are given the drug and then given a short time to memorize..
according to a survey 90 of senior executives at major u.s corporations felt that the federal budget will not be
Moving average oscillators are often used to determine when to buy and sell (or sell short) securities. They also can be used to help signal trends in the underlying data.
In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied.
Prepare a report with your rankings of the judges. Also include an analysis of the likelihood of appeal and case reversal in the three courts. At a minimum, your report should include the probability of cases being appealed and reversed in the thre..
Show that the rate of premium payment is Px + Py - Pxy, where Px denotes the rate of premium payment for a 1-unit whole life insurance on x with premiums payable for life.
(a) Let N(t) be the number of system failures in the interval [0,t]. In what case(s) will the stochastic process {N(t),t ≥ 0} be a renewal process if the random variables Sk do not all have an exponential distribution? Justify.
prediction interval for the regression line.using the age and sick days data from table below find the 98 prediction
Compute an estimate for the mean lead-user rating of all 8-year-old male children with 10 direct ties to other peers and with four shortest paths between peers.
Assuming 250 of each sex, can we conclude that there is a significant difference in the proportions at a 0.05 level of significance?
The New York City Housing and Vacancy Survey showed a total of 59,324 rent-controlled housing units and 236,263 rent-stabilized units built in 194 or later.
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