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A random sample of 1400 movie goers in Flagstaff found 434 movie goers who had bought popcorn on their last visit. Find a 95% confidence interval for the true percent of movie goers in Flagstaff who have bought popcorn on their last visit. Express your results to the nearest hundredth of a percent.
we know many types of data fall into a normal distribution with most of the observations falling toward the middle.
(a) Remove the influence of seasonal factors on the number of visitors to the Addo National Park for each of the periods from 2008 to 2010. (b) Plot both the original data series and the de-seasonalised data series of the number of visitors to the..
In the business world, the mean salary is often to describe the salaries of employees of a company. However, the median salary may be a better measure of the salaries than the mean. Which is the better measure of central tendency? Why
a sample of size 40 from housing units is selected and a hole diameter for bushings on the housings is determined for
Suppose that the actual mean value in the population is mu =120 , what is the probability of a Type II error (incorrectly accepting a false null hypothesis)?
data were collected on gpa and number of facebook friends for students in a small statistics class. some summary
A few random results for you to ponder...do the results justify the conclusions? Why or why not? Give a reason why the conclusions don't necessarily follow from the statement.
Describe how you would develop a random sample from among students.
Given the following before-and-after ratings, use the 0.05 level in determining whether there has been a significant improvement in the ratings received by the instructor.
Is the researcher expecting a positive or a negative correlation?- Draw a scatter plot of the data.- Do the data appear to be roughly linear?
Summarize the relationship between sample size and confidence level.
small sample mean problem. the maker of mini-oats cereal uses an automated packaging machine to pack its 24 ounce box
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