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The U.S. National Center for Health Statistics compiles data on the length of stay by patients in short-term hospitals and publishes its findings in Vital and Health Statistics. Data from a sample of 39 male patients and 35 female patients on length of stay (in days) are displayed in the histograms below.
a) What would you suggest be changed about these histograms to make them easier to compare?
b) Describe these distributions by writing a few sentences comparing the duration of hospitalization for men and women.
c) Can you suggest a reason for the peak in women's length of stay?
A tire company made a sampling distribution on one of its brands of tires and determined that the tire had a mean life of 56,000 miles with a standard deviation of 18,100 miles.
What are the four assumptions for the chi-square tests? What are the hypothesis when conducting the chi-square tests for goodness-of-fit?
Test the hypothesis that the median weight of NFL players is 250 pounds against the alter- native that it is greater at α = 0.05, using (a) the large sample sign test and (b) the Wilcoxon signed rank test.
What are the respective sample means on "feelsafe" (Importance of Safety) for males and females from the SPSS Tables Set-1, when visiting a sports bar?
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).
a box has three red balls and four green balls in it. a gambler bets 1 on red. a ball is randomly chosen. the gambler
1. an opinion poll asked british columbians are you in favour of a las-vegas-style casino in vancouver? yes or no. a
A person often finds that she is up to 1 hour late for work. If she is from 1 to 30 minutes late, $4 is deducted from her paycheck; if she is from 31 to 60 minutes late for work, $8 is deducted from her paycheck.
kyle averages 5 finished accounts per day. his standard deviation is 1 account per day and we want to know how many accounts he has to finish in a day to be at his 79.95 percentile
consider the following experiment flip a coin. if you obtain heads roll a die. if you obtain tails draw a ball from a
A random sample of 36 drinks from a soft drink machine has an average content 7.6 ounces with an standard deviation of 0.48 ounces. Test the hypothesis ounces against the alternative hypothesis at the 0.05 level of significance.
Which type of graphical display would be an appropriate choice for summarizing the gender data, a bar chart or a dotplot? Which type of graphical display would be an appropriate choice for summarizing the weight data, a bar chart or a dotplot?
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