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You want to compare response rates (percents) of two regimens. A power of 90% and a two-sided test of size 0.05 are desired. How many patients are needed to detect a difference between true response rates of p1=30% and p2=50%? Let the proportion in group 1 be q1 = 0.4. Use the appropriate formula and show your work
How will you separate the effect of advertising on sales?
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level
ten weeks of data on the commodity futures index are 7.35 7.40 7.55 7.56 7.60 7.52 7.52 7.70 7.62 and 7.55.a construct
Your company has two warehouses in Detroit and Dallas. Detroit has 150 units ready to ship, Dallas 180 units. You have to fulfill two orders, one for 120 units to New York, and one for 190 units for Las Vegas.
Experts claim that 10% of murders are committed by women. is there enough evidence to reject the claim if in a sample of 67 murders, 10 of them were committed by women? use a significance level of .01
Why do so many of life's events share the same characteristics with Central Limit Theorem? Why are estimations and confidence intervals important?
Mathml equation = $32,000 and mathml equation = $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
What is the p-value? Use a .05 level ofsignificance. What is your conclusion?
Scores for men on the verbal portion of the SAT test are normally distributed with a mean 509 and a standard deviation of 112. Randomly selected men are given the Columbia
A month is classified as "extremely wet" if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as "extremely wet".
To find the probability values in case of raw data, binomial, normal
A biologist estimates that 40% of deer in the region carry a certain type of tick. For a sample of 300 deer selectetd at random, what is the chance that 124 or fewer deer have this tick?
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