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Chapter 9: Q. 1 (page 536)
You are testing that the mean speed of your cable Internet connection is more than three Megabits per second. What is the random variable? Describe in words.
The random variable defined here is the mean Internet speed in Megabits per second.
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The cost of a daily newspaper varies from city to city. However, the variation among prices remains steady with a
standard deviation of 20¢. A study was done to test the claim that the mean cost of a daily newspaper is $1.00. Twelve costs
yield a mean cost of 95¢ with a standard deviation of 18¢. Do the data support the claim at the 1% level?
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 Weather Underground reported that the mean amount of summer rainfall for the northeastern US is at least inches. Ten cities in the northeast are randomly selected and the mean rainfall amount is calculated to be inches with a standard deviation of inches. At the level, can it be concluded that the mean rainfall was below the reported average? What if ? Assume the amount of summer rainfall follows a normal distribution.
A statistics instructor believes that fewer than of Evergreen Valley College (EVC) students attended the opening night midnight showing of the latest Harry Potter movie. She surveys of her students and finds thatof them attended the midnight showing.
At a level of significance, an appropriate conclusion is:
a. There is insufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is less than.
b. There is sufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is more than
c. There is sufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is less than.
d. There is insufficient evidence to conclude that the percent of EVC students who attended the midnight showing of Harry Potter is at least
"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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