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Describe data and objectives - starting with descriptive statistics reader has no idea what this is all about; histogram needs much finer bins to be of use; given the ratio of the 2 variances can not pool them, so pooled variance analysis not correct; total degrees of freedom is wrong - check textbook; you start with scatterplots and correlation before regression; scatterplots need to be much more refined to be of use; so, you have a relationship - how much of the variation does the model explain and what are the practical conclusions?
Random sample of 40 November days (taken over many years)? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
probability based on a random experiment.1. the telephone numbers for a region of a state have an area code of 570. the
What the degree of freedom tells us? What are the degree of freedom for t- test, X^2-test, and for F-twst?
26% of college students say they use credit card because of the rewards program . You randomly select 10 college students and ask each to name the reason he or she uses credit cards.
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
Construct the payoff table for this decision situation. Compute the expected value of each alternative amount of milk that could be stocked, and select the best decision.
In the class, there are 17 females (of whom 8 are freshmen) and 16 males (of whom 7 are freshmen). If one student is selected at random, what is the probability of selecting a freshmen or a female?
The US energy administration publishes data on residential energy consumption and expenditures in residential consumption survey: consumption and expenditures.
Explain in your own words (no direct quotes, please) what it means when there is an interaction between two factors.
How is the null hypothesis chosen (why is it null)? What is the importance of rejecting the null hypothesis in relation of the sample to the population?
Clearly identify the independent and dependent variables you would study. Determine whether an independent-samples or related-samples t test is most appropriate and why. Generate the statistical null and alternative hypotheses.
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
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