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A company that manufactures video cameras produces a basic model and a deluxe model. Over the past year, 30% of the cameras sold have been of the basic model. Of those buying the basic model, 31% purchase an extended warranty, whereas 50% of all deluxe purchasers do so. If you learn that a randomly selected purchaser has an extended warranty, how likely is it that he or she has a basic model? (Round your answer to four decimal places.)
life expectancies for men and women were measured by country. it was found that the average male life expectancy was
a researcher is interested in determining the proportion of first year university students who have suffered hearing
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
A population has mean 325 and variance 144. Suppose the distribution of sample means is generated by random samples of size 36.
assume that you are testing ho p .5 vs. ha p gt .5 and that based on the collected data the p-value of the test is
A researcher is using a chi-square test to determine whether there are any preferences among four brands of cola. With alpha = .05 and a sample of n = 30, what is the boundary for the critical region for the hypothesis test.
it is estimated that 56 of the children between the ages of 3 and 5 years are already enrolled in school. in a sample
A Patent Medicine Company supervisor assumes that the bottling machine is operating properly if only 5 percent of the processed bottles are not full. A random sample of 100 bottles had 7 bottles that weren't full. Using a significance level of .01..
Suppose you are working with a data set that is normally distributed with a mean of 400 and a standard deviation of 20. Determine the value of x such that only 1% of the values are greater than x. (how to find the value of x with z score)
after a military campaign sample of 59 soldiers were examined it was determined that 32 of them suffered from lifetime
Can we reject the hypotesis that the birthays are equally during each season of the year? use the 0.10 level of significance
A least squares linear trend line is just a simple regression line with the independent variable being time (months or years for example).
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