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Chapter 9: Q.7 (page 537)
In a population of fish, approximately 42% are female. A test is conducted to see if, in fact, the proportion is less. State the null and alternative hypotheses.
The null and alternative hypotheses areandrespectively.
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It is believed that a stock price for a particular company will grow at a rate of per week with a standard deviation of. An investor believes the stock won’t grow as quickly. The changes in stock price are recorded for ten weeks and are as follows: ,,, , ,, ,,, . Perform a hypothesis test using a level of significance. State the null and alternative hypotheses, find the -value, state your conclusion, and identify the Type and Type errors.
Marketers believe that of adults in the United States own a cell phone. A cell phone manufacturer believes that number is actually lower. American adults are surveyed, of which, report having cell phones. Use a level of significance. State the null and alternative hypothesis, find the -value, state your conclusion, and identify the Type and Type errors.
A statistics instructor believes that fewer than of Evergreen Valley College (EVC) students attended the opening midnight showing of the latest Harry Potter movie. She surveys of her students and finds that 11 of them attended the midnight showing. The Type I error is to conclude that the percent of EVC students who attended is ________.
a. at least , when in fact, it is less than .
b. , when in fact, it is .
c. less than, when in fact, it is at least .
d. less than , when in fact, it is less than .
"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?
An article in the San Jose Mercury News stated that students in the California state university system take years, on
average, to finish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey of
students and obtain a sample mean of with a sample standard deviation of Do the data support your claim at the
level?
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