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As part of a study,investigators wanted to assess the accuracy of self reported smoking status. Participants are asked whether they currently smoke or not. In addition, laboratory tests are performed on hair samples to determine presence or absence of nicotine. The laboratory assessment is considered the gold, or truth about nicotine. The data are as follows:
.......................................... . Nicotine Absent ................. Nicotine Present
Self reported Non smoker. ........................ 82 ............................... 14
Self reported Smoker ................................. 12 .............................. 52
A. What is the sensitivity of self reported smoking status?
B. What is the specificity of self reported smoking status?
A state meat inspector in lowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled " 3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
This is a test regarding two dependent samples. There is sufficient evidence to conclude that the mean price of textbooks is lower at seller A.
Find the standard deviation for the number of people with the genetic mutation in such groups of 600.
A nectarine-packing firm claims that the nectarines they ship have a mean weight of 5.22 ounces. A test on n = 10 randomly selected nectarines, gave the following results, in ounces:
A precision parts manufacturer produces bolts for use in military aircraft. The specifications for bolt length are 37.50 ± 0.25 cm. The company has established an -chart and an R-chart using samples of size five.
What is the probability that at least one left-handed student in this class is forced to use a seat designed for a right-hander?
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
What are the assumptions and requirements for an LP model to be formulated and used? Under what conditions will an LP problem: be unbounded? be infeasible? have more than one optimal solution?
The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years.
Develop percent frequency distribution and construct bar chart and pie chart.
For a sample of 20 stations last Tuesday the correlation was .78. At the .01 significance level is the correlation in the population greater than 0? t= .78-20.00/.01SQRT 20=?
At the 5% level of significance, test whether the proportion of internet users paying bills online is now more than 50%.
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