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pagano and gauvreau 1993 p 133 reported data for women participating in the first national health and nutrition
in example 415 p 130 a statistically significant relationship was found between hormone therapy and invasive breast
compute the chi-square statistic and assess the statistical significance for the relationship between smoking and time
researchers asked women who were pregnant with planned pregnancies how long it took them to get pregnant baird and
compute the chi-square statistic and assess the statistical significance for the relationship between bird ownership
in a study in berlin reported by kohlmeier et al 1992 and by hand et al 1994 researchers asked 239 lung-cancer patients
the following table contains data on ear piercings and tattoos for a sample of 1375 college women the earpierce
wechsler and kuo 2000 used data from the 1999 college alcohol study to examine the relationship between student alcohol
the following 2 times 2 contingency table shows data for sex and opinion about the legalization of marijuana for
in given example a statistically significant relationship was found between hormone therapy and invasive breast cancer
imagine that 50 men and 50 women are asked do you favor or oppose capital punishment for those convicted of murder in
refer to given exercisea suppose that 500 men and 500 women had been surveyed rather than 50 of each sex as in given
a well-known example of simpsons paradox published by bickel hammel and oconnell 1975 examined admission rates for men
suppose two hospitals are willing to participate in an experiment to test a new treatment and both hospitals agree to
refer to given exercise in which one or more third variables are at least partially likely to account for the observed
this exercise presents a real example of simpsons paradox wagner 1982 the total income and total taxes paid in each of
a researcher observes that compared to students who do not procrastinate students who admit to frequent procrastination
the success rates of two treatments a and b for clinical depression are being compared the research team included five
researchers studied a random sample of north carolina high school students who participated in interscholastic
refer to given exercisea write a two-way table of observed counts for sex and whether a participant in soccer had a
in a national survey n 1000 randomly selected adults are asked how important religion is in their own lives very
the 2 times 2 contingency table that follows shows data for sex and opinion on the death penalty for respondents in the
refer to given exercisea calculate a table of expected counts for the data in given exerciseb show calculations
in a national survey n 1500 randomly selected adults are asked if they favor or oppose a ban on texting while driving