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Using the data of Exercise 129, show that the class marks also are given by the midpoint between successive class boundaries
(a) Construct a histogram of the drying times of polyurethane from the data in Exercise 115.
(b) What can be said about the shape of this histogram?
Exercise 115
The following are the drying times (minutes) of 100 sheets coated with polyurethane under various ambient conditions:
Construct a frequency distribution of these data, using eight classes.
An elevator has a uniform distribution ranging from 0 to 4 minutes. Find the mean and standard deviation of x, the time a customer on the second floor waits for an elevator.
The ancient Greeks thought that the most pleasing shape for a rectangle was one for which the ratio of the length to the width was 8 to 5, the golden ration.
Two bonus points for rigorously proving Xt and Xt+1 are not independent. Let Xt=1+et-0.5et-1, t=1,2,3,..., where et~IID N(0,2), variance of et is 2. Calculate the mean of Xt.
The mean monthly demand for steam boilers is 6.8 with a standard deviation of 1.7. Compare the dispersion of these distributions. Which demand pattern has more relative variation? Explain.
Assume that the variable B is the number of years of experience. Suppose the person has 2 years of college and 7 years of experience. What should their salary be?
The proportion p1 of all imported autos sold to 25-40 age group is greater than or equal to the proportion p2 of imported autos sold to over 40 age group?
Calculate In for an enhancement-mode nMOSFET with a length of L=l.3 µm, width of W= l 5 µm, an oxide th ickness of t0 ,=25 nm, and a threshold voltage VT=0.75 V. The drain-source voltage V05=5 V and the gate voltage Yus=3.5 V. Assume zero sub..
do males and females differ in the amounts they spend on valentines day? the average expenditure in a sample of 40 male
one test that people who wish to donate blood must undergo is a test of iron level. individuals with insuficient iron
for each of the following parts indicate whether we would generally expect the performance of a flexible statistical
A textile manufacturer estimates that it produces bolts of cloth with flaws following a Poisson distribution that has an average of one flaw per 200 feet of cloth.
Probability using normal distribution.Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
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