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A horticulturalist has been using brand A fertilizer on a certain variety of plant. A new brand B fertilizer has just been marketed, which purports to be superior to brand A. Two independent groups of n1 = n2 = 8 new plantings are to be treated (one with the brand A fertilizer and the other with the brand B fertilizer) and the times (in days) taken to achieve a certain height are recorded:
Brand A: 30 35 30 31 39 39 35 29Brand B: 30 33 29 33 35 28 30 29
Find a 99% confidence interval for the true mean difference in growth time (given that these times are approximately normally distributed and the variances are approximately equal).
for the following z-acoresm determine the percentage of scores that lie beyond z show workingstandard
Compare and contrast the similarities and differences between the two scores and explain when and why you would use each.
1 consider a resource-allocation problem having the following
a researcher conducts an experiment on the iq of twenty-five randomly selected only children and dinds that their
suppose fx y1 amp gx y xy 0lt x lt1 0ltylt1 determine the most powerful test of size ? .05 of hypxyf
financial managers inc buy and sells a large number of stocks routinely for various accounts that it manages. portfolio
explain the role of probability in the interpretation of the meaning of inferential
question if you use a 0.10 level of significance in a two-tail hypothesis test what is your decision rule for
sixty percent of all road accidents are due to distracted driving. in a random sample of 100 accidents what is the
Using the 0.05 significance level what should we conclude about the theory that 24hrs. is a natural cycle? a) use hypothesis steps b) sketch distribution c) explain to someone who never took this course.
The following table presents data on political party affiliation and class level for sample of students in certain university: If the student is selected at random from sample, determine the probability that student is Republican.
A retail grocer has decided to market organic "health foods" and will purchase a new line of products from each of two suppliers. Unknown to the grocer
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