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A computer program has produced the following output for the hypothesis testing problem:
Difference in sample means: 11.5
Degrees of freedom: 24
Standard error of the difference in the sample means:?
Test statistics: t_0=-1.88
P-Value = 0.0713
What is the missing value for the standard error? 2. Is this a two-sided or one-sided test? 3. If α=0.05, what are your conclusions? 4. Find a 90% two-sided CI on the difference in the means.
If the four bridge sites are relatively close to one another, soil conditions, although unknown, are probably similar.
A study is done to determine if Company A retains its workers longer than Company B. Company A samples 15 workers, and their average time with the company.
Describe the constructs and variables under investigation.Describe the instrument or instruments used in the research.
Assume that the standard deviation s is known to be $5.50. Using a 0.05 level of significance, would we conclude the typical amount spent per customer is more than $20.00?
In the year 2006 the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
1. Perform a multiple linear regression and describe your finding. 2. Examine the model fit. 3. Perform a residual analysis
Show that if the limiting conditions n →∞, θ →0, while nθ remains constant, are applied to the momentgenerating function of the binomial distribution, we get the moment-generating function of the Poisson distribution.
It is better to use the median rather than the mean for a distribution when:
according to most estimates 10 of the people in the general population are left-handed and 90 are right-handed. a
A population has a mean of 85 and a standard deviation of 9. With a sample size of n=81, find the mean and standard deviation.
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 81.
What, following independence from Spain, were the so-called "Liberal Reforms" enacted in certain parts of Middle America?
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