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The California Healthy Kids Survey in 1999 and 2001 asked 7th, 9th, and 11th graders in San Luis Obispo County whether they smoked tobacco. In 1999, 6% of 7th graders, 17% of 9th graders, and 23% of 11th graders admitted smoking tobacco while in 2001 the corresponding ?gures were 3%, 13%, and 22%. Create a comparative bar chart showing bars for 7th graders together, bars for 9th
Would miss but could
do without .28 .25 .35 Could de?nitely live
without .26 .34 .46
Construct a comparative bar chart that shows the distribution of responses for the three different technologies.
the mean number of errors per page made by a clerk in the word processing pool of a bank is thought to be 2.8 with the
An airplane with room for 100 passengers has a total baggage limit of 6000 pounds. Suppose that the total weight of the baggage checked by an individual passenger is a random variable x with a mean value of 50 pounds and a standard deviation of 20..
In multi-choice test, each question has four options. Students wil get 10 points for each correct answer; lose four points for each incorrect answer; and receive no points for unanswered questions.
A sample of n people is taken to obtain their opinion. The proportion p¯ in favor in the sample is taken as an estimate of p. Using the Central Limit Theorem, determine how large a sample will ensure that the estimate will, with probability .95, b..
a 95 confidence interval for a population mean u is given as 18.958 21.015. this confidence interval is based on a
Without performing any calculations, will the interval increase, decrease or stay the same? Which of the values in the formula will change?
What is 95% confidence interval estimate for average number of years served by all Supreme Court justices?
what conditions must be met before constructing a confidence interval for a proportion? be sure to be specific with
two points are randomly on a line of length 14 so as to be on opposite sides of the midpoint of the line. in other
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture.
Find out the probability that disc doesn't touch line between two planks. Find out also expected distance from center of the disc to closest line between two planks.
a catalog company that receives the majority of its orders by telephone conducted a study to determine how long
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