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Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems. She has also determined that among those who do their assignments, 90 percent will pass the course. Among those students who do not do their homework, 60 percent will pass. Mike Fishbaugh took statistics last semester from Dr. Stallter and received a passing grade. What is the probability that he completed the assignments?
A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough evidence to support the consumer's conjecture at a = 0.05 and how can this be graphed?
The length of a rod is normally distributed with mean 4 inches and variance 0.01 square inch. Two such rods are placed end to end and fitted into a slot. The length of the slot is 8 inches with a tolerance of -0.1 to 0.1 inch. What is the probability..
Heights were measured for a random sample of 20 plants grown while being treated with a particular nutrient. The sample mean and sample standard deviation of those height measurements were 39 centimeters and 12 centimeters, respectively.
In a study relating the amounts of time required for room service delivery at a newly opened Radisson Hotel, 20 deliveries had a mean time of 24.2 min and a standard deviation of 8.7 min. The sample data appears to have a bell-shaped distribution...
What is the probability that a randomly selected bag has between 1000 and 1200 chips? What is the probability that a randomly selected bag has fewer than 1000 chips?
What is the percentage of variation in the dependent variable explained by the variation in the independent variable.
If 8 patients participate in this study (so that n left arms and n left arms are measured), how many degrees of freedom should the researcher use in her t-test critical value?
From the past experience he knows that he population standard deviation is three days in testing to determine his blief he could use one of the following plans n=100 a=.01 n=75, a=.o5 n=50, a=.10.
A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
A study of 20 worldwide financial institutions shows the correlation between their assets and pretax profit to be .86. At the .05 significant levels, can we conclude that there is positive correlation in the population?
The demand for airplane passengers (Y) is a function of a average fare (X1), the fare of the competing airline, and the annual per capital income of the passengers(X3)
9 of 199 males receiving tPa and 13 of 97 males in control group died within 12 months. Create observed and expected contingency tables for these data.
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