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A previous analysis of paper boxes showed that the the standard deviation of their lengths is 13 millimeters. A packer wishes to find the 95% confidence interval for the average length of a box. How many boxes does he need to measure to be accurate within 4 millimeters?
A. 11
B. 58
C. 41
D. 29
If you select a random sample of 16 customers: what is the probability that the mean time spent per customer is at least 3 minutes?
A gallop poll that was based on telephone interviews conducted April 9-12, 2012, using a random sample of 1016 adults aged 18 and older, living in all 50 US states and the District of Columbia, indicated that 29% of Americans spent more money in rece..
according to recent estimates only 45 of people in africa have access to safe drinking water this being the major
in china the probability of a baby being a boy is 0.5845. couples are allowed to have only one child. if relatives give
If the monthly demand for videos on average is 180 and standard deviation = 60, what is the number of videos the manager should order to meet 90% customer demand?
Find a confidence interval for the mean assuming that each sample is from a normal population. Mean = 127, s = 27, n = 16. Find the 90% Confidence Interval.
A sample of 9 customers is selected. What is the probability that exactly 2 customers in the sample will default on their payments?
the professor plots a histogram of these several proportions. Should a Normal model be used to represent the sampling distribution of the proportion of tails?
Suppose that you have a sample mean of 49 and a standard deviation of 3, but now found those values from a sample of 20 observations. test the hypothesis allowing for type 1 error to equal .05.
The mean of a normal probability distribution is 60; the standard deviation is 5.
How can standardized z-scores be used to compare people across different contexts, such as the batting averages of two players -one who played in the 1970s and one who played in the 1990s?
the cost of a college education has increased at a much faster rate than costs in general over the past twenty years.
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