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Gain Communications sells aircraft communications units to both the military and the civilain markets. Next year's sales depend on market conditions that cannot be predicted exactly. Gain follows the modern practice of using probability estimates of sales. The military division estimates its sales as follows.
X = units sold 1000 3000 5000 10000Probability 0.2 0.2 0.3 0.3The corresponding sales estimates for the civilian division are as follows.Y = units sold 300 500 750Probability 0.4 0.5 0.1We have already calculated the following statistics.μX = 5300 units; σX2 = 11410000; μY = 445 units; μZ = $12157500, where Z = 2000X + 3500Y
Find the standard deviation of the estimated profit, Z = 2000X + 3500Y.
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
Assume half of the 200 passengers are men. What doorway height satisfies the condition that there is a 0.95 probability that this height is greater than the mean height of the 100 men?
He would like 95% confidence intervals for the average price people would be willing to pay: one for the higher-income group, one for the lower-income group.
For each of the following, indicate whether or not you would expect it to have a strong seasonal component and why.
A group of teenagers were monitored closely over the period of several weeks to measure how frequently they watched violent television programs.
A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
Develop a point of the population standard deviation for life expectancy of VCRs.
Why do you use the chi-square statistic? What type of data is used with chi square analysis?
A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 35000 miles. To check the claim the firm randomly selects and test 54 of these tires and gets a mean lifetime of 34,570
Develop a hypothesis, label the independent and dependent variables, discuss what the experimental and control groups are doing in this study, and decide who (and how many) participants are needed. Be sure to discuss random sampling and random ass..
Critically discuss why you would or would not expect each of the following variables to be normally distributed.
A math course has 2 sections. Section one has 55 students of which 10 received an A. Section two has 45 students of which 11 received an A. If a student was chosen randomly from 100 students
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