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In 1984 the country of Morocco in an attempt to determine the average amount of time that tourists spend in that country on a visit tried two different sampling procedures. In one, they questioned randomly chosen tourists as they were leaving the country; in the other, they questioned randomly chosen guests at hotels. (Each tourist stayed at a hotel.) The average visiting time of the 3000 tourists chosen from hotels was 17.8, whereas the average visiting time of the 12,321 tourists questioned at departure was 9.0. Can you explain this discrepancy? Does it necessarily imply a mistake?
Suppose these data represent whole population. Determine the population mean and population standard deviation.
an educator claims that the drop out rate for seniors at high school in ohio is 15. last year 38 seniors from a random
1- use a ruler to measure the thickness of a single page of the text. awhich unit of measurement did you use amp why?2-
The simplest useful numerical description of a distribution consists of measure of center and measure of spread. The Median is the 50th percentile. Q: Why is not the Mean the 50th percentile?
In the boom years of the late 1990s, it was often said that rapidly increasing stock prices were responsible for much of the rapid growth of real GDP. Explain how this could be true, using aggregate demand and aggregate supply analysis
suppose that x and y are independent exponential random variables each with rate lambda. what is the conditional
a random sample of size 64 is drawn from a population with mean 80 and standard deviation 20. describe the sampling
In a recent study, a random sample of children in grades two through four showed a significant negative relationship between the amount of homework assigned and student attitudes. What is the explanatory variable and what is the response variable?
determine whether the distribution is a discrete probability distribution.x px0 0.001 0.002 1.003 0.004 0.00is the
The probabilities of the weather being fine, raining, or snowing are respectively 1/2, 1/3, and 1/6. The probabilities that a student arrives on time for school under each of these conditions is 3/4, 2/5, and 3/10 respectively. What is the probabi..
At.05 level of significance can director conclude that there is difference in the number of circuit cards bought by month?
a researcher would like to determine whether an over the counter medication has an effect on mental alertness. a sample
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