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Parking, part 2. Suppose that for budget planning purposes the city in Exercise 23 needs a better estimate of the mean daily income from parking fees.
a) Someone suggests that the city use its data to create a 95% confidence interval instead of the 90% interval first created. How would this interval be better for the city? (You need not actually create the new interval.)
b) How would the 95% confidence interval be worse for the planners?
c) How could they achieve a confidence interval estimate that would better serve their planning needs?
Assume that a normal model with a mean 263 days and standard deviation can describe the duration of human pregnancies 12 days. At least how many days should the longest 30% of all pregnancies last?
The benefits office wants to investigate whether a relationship exists between the level of an employee and their interest in a 401k plan. Using the above data, conduct a chi-square analysis and respond to the following question
A coin is flipped e times and heads (h) or tails (t) are recorded:
Shoveling Heart Rates Because cardiac deaths appear to increase after heavy snowfalls, an experiment was designed to compare cardiac demands of snow shoveling to those of using an electric snow thrower.
Assume that these distributions are distributed as normal random variables with the means and standard deviations given previously. Find the probability that the return for common stocks will be greater than 8%.
sincere stationary corporation needs to raise 450000 to improve its manufacturing plant. it has decided to issue a 1000
Using a separate 2 by 2 table, compute predictive value positive and predictive value negative for population of 1,000 drug users.
suppose that a random sample of size 25 is to be selected from a population with mean 41 and standard deviation 9. what
question a student is taking two courses history and math.nbsp the probability the student will pass the history
one of the first conditional probability paradoxes was provided by bertrand.23 it is called the box paradox. a cabinet
Based upon all of this information, do a "goodness-of-fit" test to see if the distributions are the same as they were two years ago. Use a level of confidence of .01. Should we accept Ho or reject Ho?
the per-store daily customer count i.e. the mean number of customers in a store in one day for a nationwide
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