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Response time at an online site can be modeled with an exponential distribution with a mean service of 5 minutes. John knows this and it is not sure to wait for an answer. What is the probability that for the reply to John's request
(a) What is the probability that the reply to John's request takes longer than 10 minutes?
(b) What is the probability that the reply to John's request takes shorter than 10 minutes?
(c) If the mean service is now 2 minutes, what is the probability that it takes longer than 10 minutes?
Compute the Kappa statistic and its standard error reading reproducibility of the diagnosis of dyspnea in this clinic.
Find the z-score for a car driving 20 mph in this construction zone. It is an outlier (assume the data is bell shaped, so dont actually test it with pearsons index).
A bank has the following data on the gender and marital status of 200 customers.What is the probability of finding a single female customer? Is marital status independent of gender? Explain using probabilities.
If the test is positive, what is the probability that this person actually has heart disease?
A report by the NCAA states that 57.6% of football injuries occur during practices. A head trainer claims that this is too high for his conference, so he randomly selects 36 injuries and finds that 17 occurred during practices. Is his claim correc..
Develop a test of hypothesis to determine if the mean time spent in the mall is more than 0.75 hours. Use the .05 significance level.
Suppose you wish to test a one-tail hypothesis where you reject H0 only in the lower tail. You calculate ZSTAT = 1.38. What is the statistical decision if you test the null hypothesis at the 0.01 level of significance?
What is the probability that during 5 minutes interval no one will enter the store? b) what time interval is such that the probability is 0.5 that no one will enter the store during that interval?
If the probability of getting caught copying someone else's exam is .1, find the probability of not getting caught in three attempts. Assume independence.
ExxonMobil's required return for equity, re is 14%. Its required return for debt, rd is 8%, its debt-to-total-value ratio L, is 35%, and its marginal tax rate, T is 40%, calculate its (adjusted WACC)?
Infer that the difference in the level of satisfaction with service between the two branches.
A standard deviation of 1 month will have a total lifetime of at least 45 months if all of the bulbs are used non stop.
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