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In a particular February, the mean cost for an airline round-trip with a discount fare was $258. A random sample of 15 round-trip discount fares during the month of March provided the following data:
310 260 265 255 300 310 230 250 265 280 290 240 285 250 260
a. Using α = .05, test to see whether the mean round-trip discount fare has increase in March. What is your conclusion?
b. What is the p-value?
The data are number of trials to learn to go left at the first turn in a maze for each of their 20 rats. Answer each of the four questions and don't forget to include a verbal statement of your interpretation of the outcomes.
We wish to estimate the population proportion. We want to be 95 percent confident of our results and we want the estimate to be with .01 of the population parameter. No estimate of the population proportion is available. What value should we use f..
Paired samples t-test for the given data - financial advice from the voluntary organization - A local voluntary organization affiliated to the Citizens Advice Bureau offers free financial advice to residents in the area who are registered debtors
Suppose you had flipped a fair coin 19 times and "tails" had come up each time. The probability of now tossing a "head" on the 20th flip would then be:
How do we use a least squares regression line? What is the range for the coefficient of determination?
Find the 90% confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard deviation of 6.8 minutes.
What is a test statistic and how is it related to a critical value in hypothesis testing? What is the critical region in hypothesis testing and why is it important?
A study of the scores on an in-plant course in management principles and the years of service of the employees enrolled in the course yielded the following statistics.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Determine the following: the three different types of shows you want to compare; the mood you will measure and how you will measure it; what you think will happen-how you think each group will score on the mood measure you use.
If the server has 40 customers in one shift, what is the probability that her total tips are less than $250? (Assume that these 40 customers represent a simple random sample).
A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 8 is removed from the sample, what will be the value of the new mean?
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