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A student has submitted a concrete cylinder to the "strength contest" in Engineering Open House. Suppose the strength of her concrete cylinder is lognormally distributed with mean and standard deviation of 100 kips and 20 kips, respectively. She was schedules to be the last contestant for load testing. Immediately prior to her cylinder being tested, the two highest strengths in the contest thus far are 120 and 80 kips.
(a) What is the probability that she will be the first place winner?
(b) What is the probability that she will be the second-place winner?
(c) Suppose her cylinder is being tested, and it has not shown any sign of distress at a load of110 kips. What is the probability that she will win the first place?
In Dallas some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 143, 348 runs and had 20 accidents, while the fleet of yellow firetrucks made 135,035 runs and had 4..
A government worker claims that the standard deviation of the mean weight of all US Postal Service shipments is 0.40 pounds. If a hypothesis test is performed, how should you interpret a decision
Assume that the standard deviation of college student IQ's is 10. A random sample of 100 students from a college showed an average IQ of 110. Compute a 95% confidence interval for the mean IQ of students attending this college.
Does this sample provide enough evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of the general population? Use a two-tailed test with α = .01.
The population mean annual salary for first year faculty at SLU is $47,000. Assuming that the population standard deviation is $1800:
If the sum of the squared deviations about the regression line is SSE = 40.0, what is the coefficient of determination?
They have collected data on gender, shoe size, and height to see if they can change their business model to include only one size of shoes regardless height or gender of the wearer.
the mean weight of loads of rock is 50.0 tons with a standard deviation of 12.0 tons. if 16 loads are chosen at random
let b and c be independent random variables uniformly distributed over 07 and 03 respectively. what is the probability
Suppose you wish to build a spa on a wood deck. The deck is to be built 4 ft above level ground. It is to be 50 ft by 30 ft and is to contain a spa that is circular with a 14-ft diameter. The spa is 4 ft deep.
You are given the sample mean and the sample standard deviation. use this information to construct the 90% and 95% confidence intervals for the population mean.
The planner randomly selected 1000 orders and found that 180 orders were shipped late. Construct the 99% confidence interval for the proportion of orders shipped late.
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