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A researcher claims that the variation in the number of days that factory workers misses due to illness is greater than the variation in number of days missed by hospital workers. A sample of 42 hospital workers had a standard deviation of 2.1 days, while a sampe of 65 factory workers had a standard deviation of 3.2 days. At alpha = 0.05, is the researcher correct in his claim?
a large industrial firm allows a discount on any invoice that is paid within 30 days. of all invoices 10 receive the
One definition of a low-mileage car is one that is 4 years old and has been driven less than 45,000 miles. What percent of the cars returned are considered low-mileage?
a psychologist is conducting a study in which 30 students attend workshops by the speaking center for one hour per week
suppose you are conducting a study with a total of 50 participants from five different regions of the country and you
Suppose that for a particular flight involving a jumbo-jet with 265 seats, the airline sells 278 tickets. What is the probability that the airline will not have enough seats for all the ticket holders who show for the flight?
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 150 was taken, and the mean amount spent was $225.
Number of days of accrued annual leave. suppose that the mean and variance are 12 and 144, respectively. What is the probability that a sample of size 100 will yield a mean greater than 9?
When someone buys a ticket for an airline flight, there is a 90% probability that a person will not show up for the flight. Air America books 15 people on a commuter flight that can only seat 13 passengers.
question in a completely randomized design 10 experimental units were used for the first treatment 12 for the second
Is there sufficient evidence to indicate that the mean annual percentage turnover for U.S. plants exceeds the corresponding mean percentage for Japanese plants?
question a dean of a business school wanted to know whether the graduates of her school used a statistical inference
Can you describe in detail the differences in ANOVA and the five-step hypothesis testing method?
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