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According to Money, the average U.S. government bond fund earned 3.9% over the 12 months ending in February 2007. Assume a standard deviation of 0.5%.
What is the probability that the average earning in a random sample of 25 bonds exceeded 3.0%?
When rain is forecast, Mr. Pickwick takes his umbrella. When rain is not forecast, he takes it with probability 1/3. Find the probability that Pickwick has no umbrella, given that it rains.
At the end of the year, an achievement test is administered and the two groups are compared- Is this an experiment or an observation and If it's an experiment, what is the response variable? If it's an observation, what are they observing?
let x-bar1 117 x-bar2 90 s1 10.8 s2 11.4 n1 50 n2 50. find a 95 confidence interval for the difference in the
When considering the symmetric approximation and Monte Carlo risk approaches. Both make the assumption that the total cost distribution is normal.
Let (S, d) be a metric space and X a subset of S. Let the restriction of d to X × X also be called d. Show that the topology on X metrized by d is the same as the relative topology of the topology metrized by d on S.
a. What is the null hypothesis for this test? b. What is the alternative hypothesis for this test? c. Is this a one-sided or two-sided test? How do you know? d. Will you use a z-test or a t-test in this situation? Why?
Average cost of $3,200 for products. n=25. After review it seems mean cost is $2,000 with a standard deviation of $150. Test that average cost is $3,200 or more versus $2,000. assume level of significance of .05.
For the system described in Problem P10.13, the goal is to achieve a phase margin of 50° with the additional requirement that the time to settle (to within 2% of the final value) be less than 4 seconds. Design a lead network to meet the specifica..
ACT scores are normally distributed with mean 18 and standard deviation 6. Assuming that both tests measure the same kind of ability, who has the higher score, and why?
If appropriate, use the Tukey-Kramer procedure to examine differences among machines. What can you conclude about the effects of machines on breaking strength? Explain.
Order pizza with this new crust again. Calculate a 98% confidence interval for the proportion of customers who would order the new thin crust pizza again.
one out of 5000 individuals in a population carried a defective gene. a random sample of 1000 individuals is studied.
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