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Question: Smoking 2004. National data in the 1960s showed that about 44% of the adult population had never smoked cigarettes. In 2004 a national health survey interviewed a random sample of 881 adults and found that 54.6% had never been smokers.
a) Create a 95% confidence interval for the proportion of adults (in 2004) who had never been smokers.
b) Does this provide evidence of a change in behavior among Americans? Using your confidence interval, test an appropriate hypothesis and state your conclusion.
for testing the difference between two population proportions the pooled proportion estimate should be used in the
Consider random samples of size 58 drawn from population A with proportion 0.73 and random samples of size70 drawn from population B with proportion 0.63. Find the mean and standard error of the distribution of differences in sample proportions, p-..
In an effort to determine the size of an animal population, 100 animals are captured and tagged. Some time later, another 50 animals are captured.
A researcher determines that x2= 3.76 to test for significance for a phi correlation coefficient. What was the decision for this phi correlation test?
consider the recurrence relation an 2an ? 1 3n.a write the associated homogeneous recurrence relation.b find the
1. The random vector (X, Y )t has a two-dimensional normal distribution with Var X = Var Y . Show that X + Y and X - Y are independent random variables.
If the number of misprints in a chapter of his prob- ability book is Poisson distributed with mean 2 and if the number of misprints in his history chapter is Poisson distributed with mean 5, then assuming Sam is equally likely to choose either boo..
find the mean variance and standard deviation of the binomial distribution with the given values of n and p.n90
High principal has decided to give an award to any student who scores in the top 10% of statewide scores. How high should a student score be to win this award? Give your answer to the nearest integer.
the comfort widget company makes severtal different widgets. the smallest widget the company manufactures has a mean
Determine the critical value for a two-tail test of a population mean at the a=0.01 level of significance based on a sample size of n=21 see attachment
Determine the first and third quartiles. Develop a box plot. Are there any outliers? Do the amounts follow a symmetric dis- tribution or are they skewed? Justify your answer.
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