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Assume a normal distribution for N = 300. How many cases would one expect to find between +1 and -1 standard deviations around the mean?
Create a probability model for the amount you win at this game.- Find the expected amount you'll win.- How much would you be willing to pay to play this game?
You wish to estimate a population proportion to within three percentage points, at 95% confidence. A sample will cost $500 plus 50 cents for every sample.
the cost per item at a supermarket follows an exponential distribution. there are many inexpensive items and a few
Determine how many men in the sample from 2008 and how many in the sample from 2006 said they were seriously trying to lose weight.
The appropriate statistic to use when testing the hypothesis for a study with three treatment groups is a one sample T test? Or two sample T test?
Find the 90% confidence interval for the true mean weight of all the college wrestlers.
a brake assembly has been tested and found to have a capacity that is normally distributed with a a mean of 275 lb and
What is the standard deviation for the average time?- Use the 95 part of the 68-95-99.7 rule to describe the variability of this sample mean.
Suppose two people independently receive tetanus shots. What is the probability that both shots still have an effect after more than five years?
If the Prudential Insurance Company surveys its customers to determine the number of children under age 22 living in each household.
a study is run to estimate the association between exposure to lead paint in childhood and attention-deficit
Calculate the approximate probability of rejecting the null hypothesis if the true mean return were equal to
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