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On the basis of past history, a car manufacturer knows that 10% (p = .10) of all newly made cars have an initial defect.
In a random sample of n = 100 recently made cars, 13% (P^ = .13) have defects. Find the value of the standardized statistic (z-score) for this sample proportion.
find the weighted mean for three exams if the first one was worth 20 and the student received a 80 the second was
The shell thicknesses of the eggs produced by a large flock of hens follow approximately a normal distribution with mean equal to 0.38 mm and standard deviation equal to 0.03 mm. Find the 95th percentile of the thickness distribution.
Assuming this finding to be based on a simple random sample of 200 attempts, construct and interpret the 90% confidence interval for the population proportion of the time the Wal-Mart site was available during this period.
The monthly rate of return for the mutual fund Invest 2000 follows a Normal distribution with mean 0.75% and standard deviation 0.3%.
The useful life of an electrical component is exponentially distributed with a mean of 2500 hours. a. What is the probability the circuit will last more than 3,000 hours.
Can you conclude that u1 is not equal to u2 at alpha=.05? State the hypothesis in orders of 1-2. construct a 99% confidence interval for the difference in true means. State the confidence interval in terms of 2-1.
For the population of Exercise 3, what sample size is required to simultaneously estimate the proportion with each blood type to within 0.02 of the true proportion with 95% confidence?
Based on these data, explain whether or not course attendance had any effect on determining of a restaurants violation of health code.
a fluid at 0.7 bar occupying 0.09 m3 iscompressed reversibly to a pressure of 3.5 bar according tothe law pvnconstant
Estimate the difference in mean travelling time to campus by taxi and bus by constructing a 90% confidence interval.
In a sample of 1000U.S.? adults,188 dine out at a restaurant more than once per week. Two U.S. adults are selected at random from the population of all U.S. adults without replacement
There are 4 entrances to a building in Philadelphia. The bldg maintenance super would like to know if the entrances are equally utilized. To investigate, 400 people were observed entering the building.
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