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Chapter 9: Q.59 (page 540)
Assume the null hypothesis states that the mean is at least . Is this a left-tailed, right-tailed, or two-tailed test?
It is a left-tailed test if the null hypothesis states that the mean is at least
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A Nissan Motor Corporation advertisement read, “The average man’s I.Q. is The average brown trout’s . So why can’t man catch brown trout?” Suppose you believe that the brown trout’s mean I.Q. is greater than four. You catch brown trout. A fish psychologist determines the I.Q.s as follows: . Conduct a hypothesis test of your belief.
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?
From generation to generation, the mean age when smokers first start to smoke varies. However , the standard deviation pf that age remains constant of around years . A survey of smokers of this generation was done to see if the mean starting age is at least . the sample mean was with a sample standard deviation ofdo the data support the claim at the level?
The US Department of Energy reported that of homes were heated by natural gas. A random sample of homes in Kentucky found that were heated by natural gas. Does the evidence support the claim for Kentucky at the level in Kentucky? Are the results applicable across the country? Why?
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