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Some people are concerned that new tougher standards and high-stakes tests adopted in many states may drive up the high-school dropout rate. The National Center for Education Statistics reported that the high school dropout rate for the year 2004 was 10.3%.
One school district whose dropout rate has always been very close to the national average reports that 210 of their 1782 high-school students dropped out last year. Is their experience evidence that the dropout rate may be increasing? Explain.
assume that 25 of all business students at a large university invest in the stock market. a random sample of 120
If we did not know that the grade distribution at Harvard was normal, is there any other technique we can apply to find out the number of students between two intervals?
The cheetahs' coach believes that the Rockets' times are normally distributed as well. Construct a 95% confidence interval the Coach to compare the two teams' sprint units.
A wire 1000ft long has a resistance of 0.5 kilo ohms and a area of 94 (CM). Of what material is the wire made?
1. calculate the residual for the x y pair 44491 4807.2. did the regression equation underestimate or overestimate the
When using the distribution of sample means to estimate the population mean, what is the benefit of using larger sample sizes?
choose independently two number B and C at random from the interval [-1,1] with uniform distribution, and consider the quadratic equation x^2+Bx+C=0. Find the probability that the roots.
If the sample mean is 12.7 oz. and the sample standard deviation is 0.70 oz., find the 95% confidence interval of the true mean.
Let X1, X21 • • • Xio denote a random sample of size 10 from a population which has a normal distribution with unknown mean 0 and variance a2 = 2. (a) Find the Uniformly Most Powerful (UMP) test of size a = 0.01 for testing the simple hypotheses
1. Let X1, X2, X3, and X4 be independent, U (0, 1)-distributed random variables. Compute
Draw a stem-and-leaf plot of these data.- Draw a histogram of these data.- Characterize the shape of the data.
Find out the expected number of correct responses under these circumstances if one in fact selects the responses at random. What is the standard deviation?
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