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A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. Provide a 95% confidence interval of the populatoin mean and interpret the results.
In Gallup polls taken at different times, subjects were asked if they owned a gun, and the number of yes responses was recorded for each time period. Is this discrete or continuous? why?
A client has an investment portfolio with mean value is equal to 4500 USD, with a standard deviation of 300 USD. What is the probability that the value of her portfolio is between 3900 USD AND 5400 USD?
Horace Mann, principal of Jones Public School, has decided to construct a time series model to obtain a 2- and a 3-period moving average to forecast student enrollments for next term.
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
What is true about the two values
Among 100 people randomly chosen in a survey, exactly 10 stated that they believed that the elected representatives are honest most of the time.
The president of Doerman Distributors, Inc., believes that 34% of the firm's orders come from first-time customers. A simple random sample of 120 orders will be used to estimate the proportion of first-time customers
What is the difference between statistical significance and practical significance? Why is statistical significance not necessarily of practical important difference to a business decision?
Can one conclude at a level of significance of .01 that the new ball has improved his game?
define or give an example of a hypothetical construct which include an explanation why operational definitions are
Consider the relationship between yearly wine consumption (litres of alcohol from drinking wine per person) and yearly deaths from heart disease (deaths per 100,000 people) in 19 developed countries.
Construct a 99% confidence interval estimate for the population mean amount of paint included in a 1-gallon can.
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