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A buyer wants to compare the cost (in dollars) of airline tickets purchased one day in advance to purchased 30 days in advance for flights from New York (JFK) to San Francisco for various airlines. Use a 0.01 significance level to test the claim that flights scheduled one day in advance cost more than flights scheduled 30 days in advance. A computer is used and it is found that the P-value = 0.0016. What can you state about the sample (independent or dependent) and what can you conclude about the evidence?
Randomly select a sample of five rental agencies. Start with row two and column two. The number is 90935. Use the first two numbers starting with 90.
Do the data demonstrate that the true mean photometer reading for the color density is significantly different from 12 at 3 percent level of significance?
Write up your results by using scientifically recognized form.
At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make? Please provide step by step solution.
If a 99% confidence interval is calculated to estimate the difference between the average hourly rates for each type of graduate, what is the margin of error? Assume both population standard deviations are equal.
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
Gestational Age (Gestage, weeks) for sample of 100 low birth weight infants, and output from fitting a simple linear regression model to data, regressing Headcirc (Y) on Gestage (X).
Formulate the null and alternative hypotheses for this application.
The weight of a product is normally distributed with a mean of four ounces and a variance of .25 "squared ounces." What is the probability that the randomly selected unit from a recently manufactured batch weighs no more than 3.50 ounces.
Conduct a test to determine whether blood lactate level (y) is linearly related to perceived recovery (x). Use alpha = .05. Find the p-value for testing the hypotheses you gave in the previous problem. Show all decimal places in your answer.
Researchers wanted to determine if there is a difference in the mean credit card debt owed by males versus females. Using α = 0.10, is there a difference. (Show all six steps of hypothesis testing.)
A university club consists of 4 men and 6 women. Two members are chosen at random without replacement. Let X = 0 if first person chosen is male, 1 if first person chosen is female. Y = 0 if second person chosen is male, 1 if second person chosen i..
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