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Chapter 9: Q.52 (page 539)
Draw the general graph of the left-tailed test.
A graph of left-tailed test was represented.
To draw a graph of a left-tailed test
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"Phillip鈥檚 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, 鈥淣o way!鈥�
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鈥檚 all just for fun.
C鈥檓on 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, 鈥淚 think it鈥檚 much less.
We must do a hypothesis test.
And if you are right,
I won鈥檛 put up a fight.
But, if not, then my case will rest.鈥�
We proceeded to call fifty guys
To see whose prediction would fly.
Nineteen of the fifty
Said piercing was nifty
And earrings they鈥檇 occasionally buy.
Then there鈥檚 the other thirty-one,
Who said they鈥檇 never have this done.
So now this poem鈥檚 finished.
Will his hopes be diminished,
Or will my nephew have his fun?
A teacher believes that of students in the class will want to go on a field trip to the local zoo. She performs a hypothesis test to determine if the percentage is the same or different from . The teacher samples students and reply that they would want to go to the zoo. For the hypothesis test, use a level of significance.
First, determine what type of test this is, set up the hypothesis test, find the p-value, sketch the graph, and state your conclusion.
Suppose the null hypothesis, , is: a patient is not sick. Which type of error has the greater consequence, Type or Type?
Suppose the null hypothesis,, is: the blood cultures contain no traces of pathogen.State the Typeand Typeerrors.
"The Craven," by Mark Salangsang
Once upon a morning dreary
In stats class I was weak and weary.
Pondering over last night鈥檚 homework
Whose answers were now on the board
This I did and nothing more.
While I nodded nearly napping
Suddenly, there came a tapping.
As someone gently rapping,
Rapping my head as I snore.
Quoth the teacher, 鈥淪leep no more.鈥�
鈥淚n every class you fall asleep,鈥�
The teacher said, his voice was deep.
鈥淪o a tally I鈥檝e begun to keep
Of every class you nap and snore.
The percentage being forty-four.鈥�
鈥淢y dear teacher I must confess,
While sleeping is what I do best.
The percentage, I think, must be less,
A percentage less than forty-four.鈥�
This I said and nothing more.
鈥淲e鈥檒l see,鈥� he said and walked away,
And fifty classes from that day
He counted till the month of May
The classes in which I napped and snored.
The number he found was twenty-four.
At a significance level of ,
Please tell me am I still alive?
Or did my grade just take a dive
Plunging down beneath the floor?
Upon thee I hereby implore.
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