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The number of passengers passing through a large South East Asian airport is normally distributed with a mean of 110,000 persons per day and a standard deviation of 20,200 persons (You need to show all your calculations and demonstrate how you obtain your results)
If you select a random sample of 16 days:
(a) What is the sampling distribution of the mean? You should give a brief explanation of your answer.
(b) What is the probability that the sample mean is less than 98,000 passengers?
(c) What is the probability that the sample mean is between 102,000 and 104,500 passengers?
Each of five boxes contains a large (but unknown) number of red and green marbles. You have been asked to find if the proportions of red and green marbles.
Several studies have found that the frequency with which shoppers browse internet retailers is related to the frequency with which they actually purchase
Tony glanced through the data and noticed that the longest time it took to service a car was 25.33 minutes. Suppose the distribution of times to service a car.
What would be the calculated probability based on relative frequency?
the independent newspaper tabulated the gender of all candidates running for election in the 1992 british general
School Dropout Rates The school dropout rate in an Indian village is about 25%, which means that 25% of the students leave school without completing.
Identify the set of possible values for each random variable. (Make a reasonable estimate based on experience, where necessary.)
Suggests a survey of area restaurants to see if the situation is pervasive. What do you think of this research suggestion? How could you improve on your boss's formulation of the research question?
For the data given below, regress one variable on the other. Is there an implication of causality, or are both variables affected by a third?
To support their proposal, they collected data and determined the following regression line for the given data, y = 0.449x - 30.27
The total duration of baseball games in the major league in the 2011 season is uniformly distributed between 447 hours and 521 hours inclusive.
The data below are from a study of lung cancer patients in Turkey (Yilmaz et al., 2000). Use these data to calculate the relative likelihood of being a smoker given that a person is female rather than male.
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