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How many close friends? How many close friends do you have? Suppose that the number of close friends adults claim to have varies from person to person with mean μ = 9 and standard deviation σ = 2.4. An opinion poll asks this question of an SRS of 1100 adults.
We will see in the next chapter that in this situation the sample mean response x‾ has approximately the Normal distribution with mean 9 and standard deviation 0.0724.
What is P(8 ≤ x‾ ≤ 10), the probability that the statistic x‾ estimates the parameter μ to within ±1?
Commute times of teachers in a large urban area are normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes. If a commute time is randomly selected, find the probability that the commute time will be greater than 51 mi..
How many treatments are there? What is the total sample size? Is there a significant difference at the 5% Level of significance? Would I accept or reject the null Hypothesis.
your company produces two products model alpha and model beta. these products have profits or contributions of 120 and
do students who learned english as well as another language simultaneously score worse on the sat critical reading exam
Highway Gas Station Convenience Store
Construct the 90% confidence interval for the mean sale time for all homes in the neighborhood.
A contractor is considering a sale that promises a profit of $34,000 with a probability of 0.7 or a loss (due to bad weather, strikes, and such) of $16,000 with a probability of 0.3. What is the expected profit?
a statistician employed by a consumer testing organization reports that at 95 confidence he has determined that the
About 5.5 percentage points in either direction from what would have been obtained by seeking out all Ohio State University female students." Do your results agree with this statement?
Let R be a unique factorization domain then show that prime element R generates a prime ideal.
Given that the sample mean is x¯=93.81, and the sample standard deviation is s=4.65, determine if there are any outliers. (We will define an outlier to be any data value outside of the x¯+_2s range.)
According to the author the labor management scene is often contentious. Why do you suppose this is and what can be done to reduce the contentiousness?
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