Confidence interval of the true proportion
A current study of 900 internet users in Europe found that 20% of internet users were women. What is the 99% confidence interval of the true proportion, p, of women in Europe who use the internet?
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Prove that sequence Un(z)=nze^{-nz^2} converges to zero for all finite z such that Re{z^2}>0 and represent this region geometrically.
For each of the following, indicate whether it is resistant to outliers or not. Do not bother to explain your answers, except for the last one.
Compare standard deviation for heights of males and standard deviation for heights of females in class. Compare values and describe what can be concluded based on numbers.
Assume that two competing television stations, station 1 and station 2, each have 50% of viewer market at some initial point in time. Create the table which illustrates market share of each station over five-year period.
Find whether no homogeneous system AX=b is consistent and if so, state solution in form X = XP + Xh, where Xp is particular solution of AX = b and Xh is solution of AX= 0, where no homogenous system equation:
The manager of the dairy store wants to determine the proportion of people who buy milk each day. Throughout one day, 150 out of 250 people bought milk. What is the 99% confidence interval for the true proportion, p, of customers who buy milk each
In 1965, about 44% of the U.S. adult population had never smoked cigarettes. A national health survey of 1472 U.S. adults (presumably selected randomly) during 2010 revealed that 677 had never smoked cigarettes.
A random sample of 20 fish were taken from the day's catch of fish in Toxic Bay and the mean level, of a chemical herbicide in their blood was found to be 20 parts per million with a standard deviation of 1.2 parts per million.
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