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A new vaccine was recently tested to see if it could prevent the painful and recurrent ear infections that many infants suffer from. The Lancet, a medical journal, reported a study in which babies about a year old were randomly divided into two groups. One group received vaccinations; the other did not. During the following year, only 333 of 2455 vaccinated children had ear infections, compared to 499 of 2452 unvaccinated children in the control group.
a) Are the conditions for inference satisfied?
b) Find a 95% confidence interval for the difference in rates of ear infection.
c) Use your confidence interval to explain whether you think the vaccine is effective.
Use the frequency chart on the age of actors and when they won a prestigious award and construct a corresponding histogram.
a regression of birth weight on the mothers estriol level is shown belowbirth weight g 2149 0.61estriol level. which
Construct a scatter diagram where the variables are the two kinds of reputation scores. Do schools given higher scores by the academicians seem to also receive higher scores from the lawyers/judges?
In Lysistrata, the Chorus of Women defeats the Chorus of Men in the first of the conflict by: ________?
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p- value.
a box contains one twenty-dollar bill and four one-dollar bills. two bills are randomly chosen one at a time without
How large should the sample size be if she wishes to be accurate within $0.10. A previous study showed that the standard deviation of the price was $.12.
What are the assumptions necessary to use the z-series test? What are the assumptions necessary of use the t-series test?
What do you expect to find if your hypothesis is correct? If you obtain the expected results, what do you conclude about the effect of the artificial sweetener on headaches?
What is the point estimate of the difference between the population means? What is the 95% confidence interval estimate of the difference between the population means?
When making the histogram from frequency table, (a) what goes along the bottom, (b) what goes along the left edge, and (c) what goes above each value?
you toss a die and your payoff is fx 0 if x 0 x 2 otherwise. what is the optimal strategy and what is your expected
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