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Travel and Transportation Amtrak would like to estimate the proportion of travelers on the Sunset Limited, from New Orleans to Los Angeles, who utilize the Sightseer Lounge en route. At the end of the trip on March 15, an Amtrak representative stopped every third person getting off the train and asked them if they used the Sightseer Lounge to buy food, a drink, or souvenirs.
a. Is this an observational or an experimental study?
b. Describe the sample in this problem.
c. Is this a random sample? If not, suggest a method for obtaining a random sample.
a simple random sample of 12 e-readers of a certain type had the following minutes of battery life.287 311262 392 313
Harold and Maude plan to take a cruise together, but they live in separate cities. The cruise departs from Miami, and they each book a flight to arrive.
I man (1994) reports that for professional golfers, a regression equation relating x = putting distance (in feet) and y = success rate (in percent).
suppose the mean systolic blood pressure in a group of individuals is 150 mmhg with a standard deviation of 15.
First assume that at least one solution to the corresponding homogeneous equation is of the form . You may have to use some other method to find the second solution to make a fundamental set of solutions. Then use one of the two methods to find a ..
what are the basic characteristics of a normal distribution and the normal
If n = 10 and you compute a confidence interval for the median using (X(k), X(n-k)), as described in box 6.1, what is the probability that this interval contains the population median if k = 2?
In what ways were African social identity, politics and economics kinship based and collective in nature? Why might transatlantic slave trade have been especially damaging to societies structured in this way?
Airbus Industries, the European maker of the A380 long-range jet, is currently trying to expand its market worldwide. At one point, Airbus managers wanted.
1. a new diagnostic test has been developed to diagnose disease y. the new test was compared to the standard diagnostic
Using a 5% level of significance and a sample size of 22, what is the critical value for a one-tailed hypothesis test?
A simple random sample of 10 households is selected from a population of 100 households. The numbers of people in the sample households are 2, 5, 1, 4, 4, 3, 2, 5, 2, 3.
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