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Four buses carrying 160 high school students arrive to Montreal. The buses carry, respectively, 34, 48, 29, and 49 students. One of the studetns is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y.
What is the probability that separates the bottom 25 percent from the rest of the distribution.
How do research questions frame studies? What type of wording would lead to a qualitative study? A quantitative one?
Find out whether quality of items produced appears to be independent of production process used. Compute expected number of defective units produced by Process 1.
The maximum allowable payback and discounted payback statistic for the project are 2 and 2.5 years, respectively. Use the NPV decision rule to evaluate this project; should it be accepted or rejected?
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
A battery manufacturer advertises the average life of its automobile battery is 60 months.what % of batteries should last between 50 and 70 months? The standard deviation is 10 months.
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
Determine the highest and lowest scores and calculate the range. Determine an appropriate interval size (i) for grouping data. Draw a frequency polygon from the data. Are the data normal or skewed?
The number of customers who have requested a reservation at full fare for this flight in the past always has a normal distribution with mean 40 and standard deviation 10. Determine how many seats should be reserved for customers who pay full fare.
According to the historical data, the life expectancy in the United States is equal to the life expectancy in Japan. A new study has been made to see whether this has changed.
Let the random variable X represent the number of defective DVD players among 200 randomly selected DVDs of this type. Does the random variable X have a binomial distribution or a Poisson distribution?
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