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One of the most popular products sold by a manu- facturer of electrical fuses is the standard 30-ampere fuse used by electrical contractors in the construction industry. The company has tested a simple random sample of 16 fuses from its production output and found the amperages at which they "blew" to be as shown here. Given this information, and assuming the data are from a normally distributed population, construct and interpret the 95% confidence interval for the population mean amperage these fuses will withstand.3
30.6 30.2 27.7 28.5 29.0 27.5 28.9 28.1
30.3 30.8 28.5 30.3 30.0 28.5 29.0 28.2 amperes
A number of minor automobile accidents occur at various high-risk intersections. A study was done. Eight intersections were chosen at random. The number of minor accidents during a 6-month period before and after the modifications were:
a construction company is designing the worlds highest commercial building at the michigan avenue in chicago. in order
a company has 1300 items. in a sample of 120 items the historical cost of each item was compared with the audited value
A typical adult has an average IQ score of 105 with a standard deviation of 20. If 20 randomly selected adults are given an IQ test, what is the probability that the sample mean scores will be between 85 and 125 points?
Each of the 6815 subjects above is considered as belonging to one of the three groups defined by the number of cups of coffee consumed per day (the three columns). Calculate for each of the three groups the proportion of subjects admitted because ..
suppose a loaf of bread cost 1.00 in 1984 and 1.80 in 2004. what is the bread price index in 2004 using 1984 as the
the supreme court has said that z-scores beyond z 2 or 3 are generally convincing statistical evidence. for a
The mean salary for engineers with less than 5 years' experience is $60,000 with a standard deviation of $5,000. Compute the z values for both Rob and Rachel.
Estimate the relative risk of neurological impairment for children exposed to secondary smoking, and calculate a 95% con?dence interval for this risk.
among the 15 scientists working on a research project 10 have ph.d.s. if four of these scientists are chosen at random
trials are performed in sequence. if the last two trials were successes then the next trial is a success with
If two registered voters are selected at random, what is the probability exactly one voter is a democrat?
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