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Chapter 9: Q. 9.2 (page 507)
We want to test whether the mean height of eighth graders is inches. State the null and alternative hypotheses. Fill in the correct symbol for the null and alternative hypotheses.
a.
b.
a. Null hypotheses is equal to.
b. Alternative hypotheses is not equal to.
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Sixty-eight percent of online courses taught at community colleges nationwide were taught by full-time faculty. To test ifalso represents California鈥檚 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
"Asian Family Reunion," by Chau Nguyen every two years it comes around. We all get together from different towns. In my honest opinion, It's not a typical family reunion. Not forty, or fifty, or sixty, But how about seventy companions! The kids would play, scream, and shout One minute they're happy, another they'll pout. The teenagers would look, stare, and compare from how they look to what they wear. The men would chat about
their business . That they make more, but never less. Money is always their subject and there's always talk of more new projects. The women get tired from all of the chats. They head to the kitchen to set out the mats. Some would sit and some would stand eating and talking with plates in their hands. Then come the games and the songs and suddenly, everyone gets along! With all that laughter, it's sad to say that it always ends in
the same old way. They hug and kiss and say "good-bye" and then they all begin to cry! I say that 60 percent shed their tears but my mom counted 35 people this year. She said
that boys and men will always have their pride, so we won't ever see them cry. I myself don't think she's correct, so could you please try this problem to see if you object?
Previously, an organization reported that teenagers spent hours per week, on average, on the phone. The organization thinks that, currently, the mean is higher. Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was hours with a sample standard deviation of . Conduct a hypothesis test, the Type I error is:
a. to conclude that the current mean hours per week is higher than , when in fact, it is higher
b. to conclude that the current mean hours per week is higher than , when in fact, it is the same
c. to conclude that the mean hours per week currently is , when in fact, it is higher
d. to conclude that the mean hours per week currently is no higher than , when in fact, it is not higher
Draw the graph of a two-tailed test.
Your friend claims that his mean golf score is 63. You want to show that it is higher than that. What type of test would
you use?
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