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The report "How Teens Use Media" (Nielsen, June 2009) says that 83% of U.S. teens use text messaging. Suppose you plan to select a random sample of 400 students at the local high school and will ask each one if he or she uses text messaging. You plan to use the resulting data to decide if there is evidence that the proportion of students at the high school who use text messaging differs from the national figure given in the Nielsen report. What hypotheses should you test?
In a code division multiple access (CDMA) communications system, k users share a radio channel using a set of n-dimensional code vectors {S1,..., Sk} to distinguish their signals.
Explain the criteria for decision-making under uncertainty and decisionmaking under risk. What is the difference between these two "other-than-certainty" classifications? Include examples of each in the essay.
in order to conduct a survey of the us senate each senator is assigned a number from 1 to 100 and a computer is then
An owner of a fast food restaurant reported to corporate headquarters that the average bill paid by his customers in the last quarter was $6.20 and that the standard deviation was $1.90.
In a sample of 12 bank tellers at a local branch office, the 7 tellers who have completed the advanced training program offered by the bank have a lower average error rate in the processing of transactions than the remaining 5 tellers.
A student wonders if tall women tend to date taller men than do short women. She measures herself, her dormitory roommate
The following chart shows the hourly wages of a sample of certified welders in the Atlanta, Georgia, area. How many welders were studied? What is the class interval?
You've decided to start training for the Iditarod, and a friend has gone out to get some puppies to form your sled dog team.
What proportion of kids aged 10-15 years is assumed to follow a normal distribution with a mean of 191 and a standard deviation of 22.4
The length of certain bricks is a random variable with a mean of 8 inches and a standard deviation of 0.1 inch, and the thickness of the mortar between two bricks is a random variable with a mean of 0.5 inch and a standard deviation of 0.03 inch.
Present your data in either a pie chart, or bar chart. Justify your use of the type of chart.
Burning calories with exercise. Table 28.13 provides data on speed and calories burned per hour for a 175- pound male using two different treadmills (a Cybex and a LifeFitness) at inclines of 0%, 2%, and 4%
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