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There are 10 keys and only one of them can open a lock. We do not know which key can open the lock, but we will try them one by one until we find the right key. We record the keys which we have already tried.
a. What's the probability of finding the right key in the first trial?
b. What's the probability of finding the right key in the third trial?
c. If we know the first two keys we tried are not the right key, what's the probability of finding the right key in the next/third trial?
The LDL cholesterol levels in a certain population has the distribution N(5.9, 0.8). 1. What is the cholesterol level of the 'healthiest' (i.e. lowest!) 20%?
Example Study 2: Another researcher finds 4,000 men over 40 who have not had heart attacks and are willing to participate in a study. She assigns 2,000 of them into a regular program of supervised exercise. The other 2,000 continued their usual..
Are Gender and type of job independent?
Use the Excel Analysis ToolPak to find the linear correlation coefficient for the systolic and diastolic measurements.
VISA Card USA wanted to determine if there is a relationship between an individual's age and the method of payment they use. They gathered data on the type of payment used by 200 individuals which is reported in the table below:
What is the probability in the sample?
AirTran Airways and Southwest Airlines were among the leaders in on-time arrivals, with both having 88% of their flights arriving on time. But for the 12% of flights that were delayed, how many minutes were these flights late? Sample data showing the..
Comment on the sign of each estimated coefficient in turn, and state whether this is what you expect. Ignore significance at this stage.
In a regression analysis, a nurse researcher found a correlation of between pain relief scores and satisfaction with nursing care.
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 64 carts, using the new method, wa..
Describe each r value in words
Sixty percent of Americans read their employment construct, including the fine print ("Snapshots," usatoday.com, January 20, 2004). Assume that the number of employed who read every word of their contract can be modelled using the binomial distributi..
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