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An ophthalmologist reviews fundus photographs 30 patients wtth macular degeneration both before and 3 month after receiving a laser treatment. To assess the efficacy, of treatment, each patient is rated as improved, remained the same, or declined.
If, 20 patients improved, 7 declined, and 3 remained the same, assess whether or not patients undergoing this treatment are showing significant change from baseline to 3 months afterward. Report a p-value.
Assume there're three states of the economy: boom, moderate growth, and recession. The annual return on company A stock and company B stock in each state of the economy is given below
Kurt's Adventures, Inc. stock is quite cyclical. In a boom economy, the stock is expected to return 30% in comparison to 12% in a normal economy and a negative 20% in a recessionary period.
For an arch chosen at random in Arches National Park, use the preceding information to estimate the probability that the height of the arch poening is:
In chi-square goodness-of-fit test when there is close agreement between observed frequency and expected frequency, chi-square test value will be small.
If random sample of 9 loads is selected for a weight check, determine the probability that mean weight of those loads is more than 40.60 tons.
A study 200 nurses found that of 125 females nurses, 56 had bachelor's degree; and of 75 male nurses; 34 had bachelor degrees. if a nurse is selected at random, find the probability that the nurse is a female nurse with a bachelor degree.
Choice of exponential smoothing constant w has little or no effect on forecast values using exponential smoothing.
What are the minimum and maximum heights it should use as a basis for its design?
Assume that a hand of 12 cards is dealt from a normal deck of 52 playing cards. What is the probability that of the 12 cards, 3 will be diamonds, 3 will be clubs, 3 will be spades, and 3 will be hearts.
A local group claims that the police issue more than 60 speeding tickets a day in their area.
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
Triathalon Times Jeff Parent is a statistics instructor who participates in triathalons. Listed below are times (in minutes and seconds) he recorded as riding a bicycle for five laps through each mile of a 3-mile loop.
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