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Over half of all American teens (ages 12 to 17 years) have an online profile, mainly on Facebook. A random sample of 491 teens with profiles found that 334 included photos of themselves.
(a) Give the 90% large-sample confidence interval for the proportion p of all teens with profiles who include photos of themselves. Large-sample Interval:?
(b) Give the plus four 90% confidence interval for p . (The plus-four interval always pulls the results away from 0% or 100%, whichever is closer. Even though the condition for using the large-sample interval is met, the plus four interval is more trustworthy.) Plus four Interval?
Assume that 60 percent of the voters in a particular region support a candidate. Find the probability that a sample of 1,000 voters will yield a sample proportion in favor of the candidate within 4 percentage points of the actual proportion.
determine the number of subgroups needed to establish the central lines and control limits for x and r charts with a
Where does the p-value come from for the spatial scan statistic used in SaTScan? How Monte Carlo simulation is used to derive a p-value for a cluster ?
On a scale from 0 to 100, the mean level of economic development among the countries in the world is 65 and the standard deviation is 10. What proportion of countries in the world have economic development scores above 80?
What is the importance of pretesting questions and instruments? What are risks of not doing this? Provide an example.
an article in ad hoc networks discussed an underwater acoustic sensor network to monitor a given area in an ocean. the
What is the proportion of people surveyed that rated the subway system from 3 to 4. What is the proportion of people surveyed rated the Subway System from 1 to 3.
Ten different people's income tax returns are done by each of the three software packages and the time is recorded for each. Which of the following is true?
it has been shown that people drive 5 - 10mph faster than the posted speed limit on a highway. it has been thought that
In a national wide survey a researcher expects 30 percent of the population will agree with an value statement. He wishes to have less than 2% error and 95% confident. What sample size is needed?
what is the equation for the regression line if n 7 ?x 69 ?y 528 ?xy 4754 and x?sup2
to examine the effectiveness of its four annual advertising promotions a mail order company has sent a questionnaire to
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