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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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"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?
La Leche League International reports that the mean age of weaning a child from breastfeeding is age four to five worldwide. In America, most nursing mothers wean their children much earlier. Suppose a random survey is conducted of 21 U.S. mothers who recently weaned their children. The mean weaning age was nine months (3/4 year) with a standard deviation of 4 months. Conduct a hypothesis test to determine if the mean weaning age in the U.S. is less than four years old.
Toastmasters International cites a report by Gallop Poll that of Americans fear public speaking. A student believes that less than of students at her school fear public speaking. She randomly surveys schoolmates and finds that report they fear public speaking. Conduct a hypothesis test to determine if the percent at her school is less than
According to the N.Y. Times Almanac the mean family size in the U.S. is . A sample of a college math class resulted in the following family sizes:
At level, is the class’ mean family size greater than the national average? Does the Almanac result remain valid? Why?
Suppose the null hypothesis,, is: the blood cultures contain no traces of pathogen.State the Typeand Typeerrors.
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