Questions from Statistics Principles

Q: x1 = 28, n1 = 254, x2 = 36,

x1 = 28, n1 = 254, x2 = 36, n2 = 301, 95% confidence

Q: The General Social Survey asked, “About how often did you

The General Social Survey asked, “About how often did you have sex in the past 12 months?” About 47% of respondents indicated they had sex at least once a week. In an internet survey for a marriage an...

Q: x1 = 804, n1 = 874, x2 = 892,

x1 = 804, n1 = 874, x2 = 892, n2 = 954, 95% confidence

Q: The drug Prevnar is a vaccine meant to prevent certain types of

The drug Prevnar is a vaccine meant to prevent certain types of bacterial meningitis, typically administered to infants around 2 months. In randomized, double-blind clinical trials of Prevnar, infants...

Q: In randomized, double-blind clinical trials of Prevnar, infants

In randomized, double-blind clinical trials of Prevnar, infants were randomly divided into two groups. Subjects in group 1 received Prevnar, while subjects in group 2 received a control vaccine. After...

Q: In October 1947, the Gallup organization surveyed 1100 adult Americans and

In October 1947, the Gallup organization surveyed 1100 adult Americans and asked, “Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?” Of the 1100 adults surveyed,...

Q: The Pew Research Group conducted a poll in which they asked,

The Pew Research Group conducted a poll in which they asked, “Are you in favor of, or opposed to, executing persons as a general policy when the crime was committed while under the age of 18?” Of the...

Q: The Harris Poll conducted a survey in which they asked, “

The Harris Poll conducted a survey in which they asked, “How many tattoos do you currently have on your body?” Of the 1205 males surveyed, 181 responded that they had at least one tattoo. Of the 1097...

Q: The body mass index (BMI) of an individual is a

The body mass index (BMI) of an individual is a measure used to judge whether an individual is overweight or not. A BMI between 20 and 25 indicates a normal weight. In a survey of 750 men and 750 wome...

Q: Researchers at Harris Interactive wondered if there was a difference between males

Researchers at Harris Interactive wondered if there was a difference between males and females in regard to some common annoyances. They asked a random sample of males and females, the following quest...