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How would we interpret a statistically significant difference in, say, a study comparing different treatments for depression? How would you contrast the interpretation of statistical significance with effect size?
Decide between two stock investment choices. Determine the probability for each condition to make the investment even between the two.
Assuming a normal distribution, What is the z-score associated with the second quartile? If we wish to have 95% confidence interval, what would be the value of the confidence coefficient?
lakewood fashions must decide how many lots of assorted ski wear to order for its 3 stores. Information on pricing, sales and inventory costs has led to the following payoff table. what decision should be made using minimax regret.
A reasonable summary of the data might be provided by relating the score Si given by Si = 1 if never, Si = 2 if irregular, Si = 3 if fall and winter, and Si = 4 if whole year. What method can be used to relate mean BMD to this score variable?
If the Pearson Correlation is 0.18, what do we get, what is the value called, and what does it tell us?
Let X1 , X2 , • • • , Xn and Yi, Y2 , • • • , Ym be independent random samples from the two normal distributions N( O, 81 ) and N(O, 82).
Determine the critical value for a left-tailed test of a population mean at the α=0.005 level of significance based on a sample size of n = 30
consider a random sample from a poission ditribution xipoiu.ashow that yne-xnbarconverges stochastically to
the purchasing department of major company has 100 employees 22 of whom have no children 50 of whom have exactly one
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
The famous YS Chang restaurant is open 24 hours a day. Waiters and busboys report for duty at 3am, 7am, 11am, 3pm, 7pm, or 11pm, and each works an 8 hour shift. The following table shows the minimum number of workers needed during the six periods ..
(a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?
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