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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 probability distribution is a mutually exclusive listing of the outcomes of an experiment which can occur by chance and the corresponding probabilities of occurrence.
How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
Using a three month moving average, what would the forecast and MAD have been for July? Which forecasting method would you recommend? Why?
The Smoky Bear Trucking Company claims the average weight of a fully loaded moving van is 12,000 lb. The highway patrol decides to check this claim.
State one referenced hypothesis including the three variables (FA as an IV, age as the covariate and RS as the DV)
Discuss whether the percent distribution of the cross-tab and chi-square supports/does not support the researcher's hypothesis.
A population that starts at 100 and doubles in growth every eight years: The expression would give the population t years after the growth starts.
If the average price of a new home is 145,000 what is the minimum and maximum prices of the houses a contractor will need to build to include the middle 80% of the market.
Given route measured in terms of passengers carried (range is 0.1 to 1). Regress lfare on dist, passen and concen, and provide the heteroskedasticity-robust standard errors.
Use an appropriate graph to compare the distribution of systolic BP for 50-54 year olds with that for 60-64 year olds. Label the axes correctly, include unit of measure and provide an appropriate title. Include your name in the title of your graph. B..
Create a 90% confidence interval for proportion of all kernels that would not pop.
Determine the critical z values. Suppose that normal distribution applies. Right-tailed test; standard deviation = 0.04.
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