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Chapter 9: Q. 9.1 (page 507)
A medical trial is conducted to test whether or not a new medicine reduces cholesterol by.State the null and alternative hypotheses.
Null hypothesis is
Alternative hypothesis is.
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Registered nurses earned an average annual salary of \(69,110. For that same year, a survey was conducted of 41 California registered nurses to determine if the annual salary is higher than \)69,110 for California nurses. The sample average was \(71,121 with a sample standard deviation of \)7,489. Conduct a hypothesis test.
The mean throwing distance of a football for Marco, a high school freshman quarterback, is yards, with a standard deviation of two yards. The team coach tells Marco to adjust his grip to get more distance. The coach records the distances for throws. For the throws, Marco’s mean distance was yards. The coach thought the different grip helped Marco throw farther than yards. Conduct a hypothesis test using a preset . Assume the throw distances for footballs are normal.
First, determine what type of test this is, set up the hypothesis test, find the-value, sketch the graph, and state your conclusion.
A sleeping bag is tested to withstand temperatures of. You think the bag cannot stand temperatures that low. State the Type I and Type II errors in complete sentences.
The mean age of De Anza College students in a previous term was years old. An instructor thinks the mean age for online students is older than She randomly surveysonline students and finds that the sample mean iswith a standard deviation of Conduct a hypothesis test.
"Phillip’s Wish," by Suzanne Osorio
My nephew likes to play
Chasing the girls makes his day.
He asked his mother
If it is okay
To get his ear pierced.
She said, “No way!”
To poke a hole through your ear,
Is not what I want for you, dear.
He argued his point quite well,
Says even my macho pal, Mel,
Has gotten this done.
It’s all just for fun.
C’mon please, mom, please, what the hell.
Again Phillip complained to his mother,
Saying half his friends (including their brothers)
Are piercing their ears
And they have no fears
He wants to be like the others.
She said, “I think it’s much less.
We must do a hypothesis test.
And if you are right,
I won’t put up a fight.
But, if not, then my case will rest.”
We proceeded to call fifty guys
To see whose prediction would fly.
Nineteen of the fifty
Said piercing was nifty
And earrings they’d occasionally buy.
Then there’s the other thirty-one,
Who said they’d never have this done.
So now this poem’s finished.
Will his hopes be diminished,
Or will my nephew have his fun?
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