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The gypsy moth is a serious threat to oak and aspen trees. A state agriculture department places traps throughout the state to detect the moths. When traps are checked periodically, the mean number of moths trapped is only 0.5, but some traps have several moths. The distribution of moth counts is discrete and strongly skewed, with standard deviation 0.7.
Question:
Use the central limit theorem to find the probability that the average number of moths in 30 traps is greater than 0.6. Give your answer to four decimal places.
What is the difference between a descriptive model that is developed using multiple regression analysis with time-series data and a model that is considered predictive?
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates
The goal is to get people thinking about how they can actually use correlation and regression in their real life, and where and how can they can really benefit from these techniques?
What is the probability that 25% or fewer male employees will indicate that they have to pick up the slack for moms working flextime?
In ANOVA, what does F=1 mean? What are the differences between a two sample t-test and ANOVA hypothesis testing?
Random samples of five hundred units that were selected daily from a manufacturing process produced an overall defective rate of 3.5%. Calculate the lower and upper control limits for a percentage control chart.
This is called a one-time fling. About 10% of all adults deliberately do a opne-time fling and feel no guilt about it!
Find out the mean number of letters that will arrive in two days.
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
Of the drivers who stop at a gas station, 92% purchase gasoline, and 6% purchase both gasoline and oil. A total of 7% purchase oil.
A school tracks the absences of pupils as part of a flu surveillance system. Regular reporting of absences among 25 students in grade 1 are taken, and based on these data, the long-run proportion of absences under normal conditions is estimated to..
What is the difference between a sample and a population? When can the same information (e.g. the age of each of the ten students in our class) be considered both sample data and population data?
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