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Chapter 9: Q. 9.3 (page 507)
We want to test if it takes fewer than minutes to teach a lesson plan. State the null and alternative hypotheses. Fill in the correct symbol for the null and alternative hypotheses.
a.
b.
a. Null hypotheses is greater than or equal to.
b. Alternative hypotheses is less than.
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Suppose the null hypothesis,, is: the blood cultures contain no traces of pathogen.State the Typeand Typeerrors.
Sixty-eight percent of online courses taught at community colleges nationwide were taught by full-time faculty. To test ifalso represents California’s percent for full-time faculty teaching the online classes, Long Beach City College (LBCC) in California, was randomly selected for comparison. In the same year,of the online courses LBCC offered were taught by full-time faculty. Conduct a hypothesis test to determine if represents California. NOTE: For more accurate results, use more California community colleges and this past year's data
Suppose the null hypothesis, , is: a patient is not sick. Which type of error has the greater consequence, Type or Type?
Over the past few decades, public health officials have examined the link between weight concerns and teen girls' smoking. Researchers surveyed a group of randomly selected teen girls living in Massachusetts (between and years old). After four years the girls were surveyed again. Sixty-three said they smoked to stay thin. Is there good evidence that more than thirty percent of the teen girls smoke to stay thin?
After conducting the test, your decision and conclusion are
a. Reject: There is sufficient evidence to conclude that more thanof teen girls smoke to stay thin.
b. Do not reject: There is not sufficient evidence to conclude that less than of teen girls smoke to stay thin.
c. Do not reject : There is not sufficient evidence to conclude that more than of teen girls smoke to stay thin.
d. Reject : There is sufficient evidence to conclude that less than of teen girls smoke to stay thin.
"Blowing Bubbles," by Sondra Prull
Studying stats just made me tense,
I had to find some sane defense.
Some light and lifting simple play
To float my math anxiety away.
Blowing bubbles lifts me high
Takes my troubles to the sky.
POIK! They're gone, with all my stress
Bubble therapy is the best.
The label said each time I blew
The average number of bubbles would be at least .
I blew and blew and this I found
Fromblows, they all are round!
But the number of bubbles inblows
Varied widely, this I know.
per blow became the mean
They deviated by , and not.
From counting bubbles, I sure did relax
But now I give to you your task.
Wasa reasonable guess?
Find the answer and pass this test!
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