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a. What is the difference in appearance between a t-distribution and a z-distribution? Why do they have slightly different appearances?
b. When do we use a t-distribution rather than a z-distribution?
Give an example representing a discrete probability distribution and a continuous probability distribution. Explain why your choice is discrete and continuous.
What is their maximum error of the estimated mean quality for a 92% level of confidence and an estimated standard deviation of 8?
As part of their application for a loan to buy Lakeside Farm, a property they hope to develop as a bed-and-breakfast operation, the prospective owners have projected:
A combination of content and supportive examples would be greatly appreciated.
Which is the probability that the median of the sample is between $17 and $20?
What is the relationship between a confidence interval and a single sample, two-tailed hypothesis test? How are they the same? How are they different?
The mean noise level of stroke floors in 20 different hospitals was 63.1 dBA, and the standard deviation was 4.1 dBA. The mean noise level for 24 hospital operating rooms was 56.3 dBA and the standard deviation was 7.5 dBA. At α = .05 can it be co..
This exercise is a "what if analysis" designed to determine what happens to the test statistics and interval estimates when elements of the statistical inference change.
Compute the mean number and median number of apples in a bag.
Generate survival times X from an exponential distribution with rate lambda=1 with a censoring distribution C being exponential with rate theta = 2/3. Then Plot Kaplan-Meier Survival curve estimates along with true survival curve for n=25,100,1000..
Assume the least squares equation is Y' = 10 + 20X. What does the value of 20 indicate?
A filling machine in a brewery is designed to fill bottles with 355 ml of hard cider. In practice, however, volumes vary slightly from bottle to bottle. In a sample of 49 bottles, the mean volume of cider is found to be 354 ml, with a standard dev..
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