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Numbers of rooms in top spas. A report of a readers' poll in Condé Nast Traveler magazine ranked 36 top resort spas. Let Group A be the top-ranked 18 spas, and let Group B be the next 18 rated spas in the list. A simple random sample of size 5 was taken from each group, and the number of rooms in each selected spa was recorded. Here are the data:
Group A
552
448
68
243
30
Group B
329
780
560
540
240
Rank all the observations together and make a list of the ranks for Group A and Group B.
Explain in words what a non-truncated scatterplot means and identify how likely it is that a causal relationship has been indicated.
Why is the margin of error larger for the difference in support between the parties than for the overall level of support?
how can you tell when you are to run an independent or a dependent sample test? give an example to help illustrate your
Problem: Marginal distributions. Give (in percents) the two marginal distributions, for marital status and for job grade.
an independent-measures research study uses two samples each with n 12 participants. if the data produce a t statistic
acording to the national association of realtors 44 of u.s. homes sold in march 2010 wre purchased by first time home
As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees at their office in downtown Cincinnati with the distance for those in downtown Pittsburgh.
Does the plot show a positive association, a negative association, or no association between the two variables? Explain.
Forty percent of the sample wanted more local news. What is the 99% confidence interval for the proportion of readers who would like more coverage of local news?
Researchers at a School of Medicine in the US have determined that children under 2 years old who sleep with the lights on have a 36% chance of becoming myopic before they are 16 years of age. It was also determined that children under 2 years old..
Give a 95% confidence interval for the proportion of all business travelers who consider legroom the most important feature.
(a) What Z value would be appropriate for a 98%service level? (b) What safety stock should Ross maintain if hewants a 98% service level? (c) What is the adjusted ROP for the brackets?
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