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Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands. Apply weights of .1, .2, .3 and .4, respectively, for the quarters. In a few words describe the trend in the number of subscribers.
31-Mar-01 28,76630-Jun-01 30,05730-Sep-01 31,33631-Dec-01 33,24031-Mar-02 34,61030-Jun-02 35,10230-Sep-02 35,30831-Dec-02 35,20331-Mar-03 34,386
Assume a population standard deviation of 450-kilowatt hours. Determine the standard error of the mean.
Explain, to a person who has never had a course in statistics, what you have done. (c) Note the ways in which the means and standard deviations differ.
The issue of how much should be spent to solve particular U.S. social problems is a complex matter, and people have diverse and conflicting ideas on these issues.
If the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female. Use the normal distribution to approximate the binomial distribution.
Estimating the individual score using normal distribution and find the minimum SAT score needed to be accepted?
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the lower limit of the 90% confidence intervel? What is the upper limit of the 90% confidence interval?
the standard deviation is $400. Suppose 90 claims are filed in one week. What is the probability that the average (sample mean) is more than $1900?
Playbill magazine reported that the mean annual household income of it's readers is $219,155. Assume this estimate of the mean annual household is based on a sample of 91 house-holds and based on past studies,
The Statistical Abstract of the United States published by the US Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds.
State along statistical certainty there is a difference among the population proportions of those favoring Statement.
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
The data collected was for each car for each type of fuel. Performance was measured in miles per gallon. Perform an ANOVA test and state the results.
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