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The probability that an open heart operation is successful is .72. What is the probability that in two randomly select open heart operations at least one will be successful? Draw a tree diagram.
A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair (in days)
The data show that 48 of the doctors picked brand x. If these data were evaluated using a chi-square test for goodness of fit, what is the expected frequency for brand x?
The average price of a home is reported to be $203,190. Use this price as the population mean, and assume the population standard deviation is 43,890.
Use a graphical technique to compare the ages, household incomes, and education of the five groups of car buyers. (Do not use Box plots or Stem-and-Leaf Display).
A letter is drawn 1,000 times, at random, from the word A R AB I A. There are two offers. (A) You win a dollar if the number of A's among the draws is10 or more above the expected number. (B) You win a dollar if the number of B's among the drawsis 10..
The standard deviation of the differences d for the paired sample data s d = ____________
You choose random sample of 50 cans, and mean amount of paint per 1-gallon can is 0.995 gallon. Is there evidence that mean amount is different from 1.0 gallon (use α=0.01).
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Kind of examination produced significant main effects on both mean mark and time taken to complete the examination.
Provide a descriptive statistic (to 1 decimal) that could be used to estimate the number of women out of 1000 in this population who have tissue abnormalities.
The team wins 55% of their night games, and 85% of their day games. According to today's newspaper, they won yesterday. What is the probability the game was played at night?
The Consumer Price Index (CPI) and the cost of a slice of pizza
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