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Two independent observations are selected randomly from a standard normal distribution. The probability that their total is smaller than 2 is
(a) 0.6115
(b) 0.6923
(c) 0.7645
(d) 0.8413
(e) 0.9207
Which one and why?
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
a popular flashlight that uses two d-size batteries was selected and several of the same models were purchased to test
supplier on-time delivery performance is critical to enabling the buyer? organization to meet its customer service
A car dealership is worried that Hondas are getting lower sales than Hyundai. Two independent random samples have been selected 630 observations from population 1 (Hondas) and 610 from population 2 (Hyundai).
The interval 6 to 12 pounds. find the probability that a person on this diet losses more than 11 pounds in the first two months.
In a recent year, 10% of all luxury cars sold were black. If 25cars of that year and type are randomly selected, find the following probabilities.(a) At least five cars are black.
How is a sampling distribution of the mean similar to and different from a distribution of raw scores? What is the standard deviation of a sampling distribution of the mean called? How is it affected by sample size?
Should the engineering firm be concerned? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
the weight of a candy bar is n50 1. we take a sample of 4 candy bars and compute the sample mean. the sample mean
seventy five percent of youths ages 12-17 have a systolic blood pressure lower than 136mm of mercury. what is the
She figures that each box costs $ 2.59 plus $ 0.21 shipping and handling, which totals $ 2.80, then she adds $ 0.70 profit to each box and sells it for $ 3.50. Do you think this is a good pricing strategy? How would it compare to marking up by a p..
How to convert a exam score (standard score) back to Percent score? e.g. Total of students 16,
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