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The management of a supermarket wanted to study the spending habits of its male and female customers. A random sample of 16 male customers who shopped at this supermarket showed that they spent an average of $55 with a standard deviation of $12. Another random sample of 25 female customers showed that they spent $85 with a standard deviation of $20.50. Assuming that the amounts spent at this supermarket by all its male and female customers were approximately normally distributed, construct a 90% con?dence interval for the ratio of variance in spending for males and females, σ2/σ2.
Each scenario involves randomly selecting n i observations from four, independent, Normal populations as described.
records show that the probability that it rains in our town on a single day is 0.35. if rain on different days
heinz plays catch-up after under-filling ketchup containers is the headline of an article that appeared on cnn.com
Determine whether each of the following is an experiment or an observational study. Also identify the explanatory and response variables.
Do you think that these types of statistics can ever be accurate? How could this statistic be biased? In what ways could scientists misinterpret the results of their studies and come up with an incorrect statistic? What are your thoughts?
dupont automotive is a major supplier of paint to the automotive industry. a survey of 100 randomly selected autos in
Critically discuss the Central Limit Theorem? How large should the sample size be if the underlying distribution of the population values are:
I survey 50 potential consumers regarding their interest in the product, 34 express an interest in purchasing it. The maximum price each would be willing to pay is shown below.
the hawks are currently winning 0.55 of their games. there are 5 games in the next two weeks. what is the probability
Could mud-wrestling be the cause of a rash contracted by University of Washington students in the spring of 1992? Two physicians at the University of Washington health center wondered this when one male and six female students complained of rashes..
the accompanying data are x advertising share and y market share for a particular brand of cigarettes during 10
A statisitcs professor plans classes so carefully that the lengths of her classes are uniformly distributed between 45.0 and 55.0 minutes. Find the probability that a given class period runs less than 50.5 minutes.
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