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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.
Using Theorem 3.15 show that PC correlation loadings extracted from a covariance matrix are identical to those from a correlation matrix if the variances of the variables are equal
find the critical value from table l for the rank correlation coefficient given sample size n 9 and alpha
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Create a stem-and -leaf diagram for the data.
Using the 0.025 level of significance, test whether the median purchase price of all homes sold in that area of the city during 2001 could have been less than $172,300.
A simple random sample of 50 adults Is obtained and each person's red blood cell count is measured (in microliters).The sample mean is 4.23.The population standard deviation for red blood cell counts is .40.Construct a 99% confidence interval esti..
Find the conservative margin of error for the arts and humanities faculty, and use it to compute an approximate 95% confidence interval for the percent of them in the population who favored this policy.
Suppose that we want to test the null hypothesis that the mean of a normal population with σ2 = 1 is μ0 against the alternative hypothesis that it is μ1, where μ1 > μ0. Find the value of K such that > K provides a critical region of size α = 0.05 fo..
Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory variable if:
Buses running a bus line near Desdemona's house run every 15 minutes. Without paying attention to the schedule she walks to the nearest stop to take the bus to town. Find the probability that she waits more than 10 minutes
Using the appropriate statistical table, what is the most accurate statement we can make about the p-value for the test?
using a particular set of data 3 types of forecasting methods were used on that data set? the first forecasting method
according to runzheimer international the average cost of a domestic trip for business travelers in the financial
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