Chapter 9: Q. 9.11 (page 515)
Assume the p-value is What type of test is this? Draw the picture of the p-value.
Short Answer
It is a left- tailed test.
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Chapter 9: Q. 9.11 (page 515)
Assume the p-value is What type of test is this? Draw the picture of the p-value.
It is a left- tailed test.
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It is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than seven hours of sleep per night, on average. A survey of LTCC Intermediate Algebra students generated a mean of hours with a standard deviation of hours. At a level of significance of , do LTCC Intermediate Algebra students get less than
seven hours of sleep per night, on average?
The error is not to reject that the mean number of hours of sleep LTCC students get per night is at least seven when,
in fact, the mean number of hours
a. is more than seven hours.
b. is at most seven hours.
c. is at least seven hours.
d. is less than seven hours.
"Blowing Bubbles," by Sondra Prull
Studying stats just made me tense,
I had to find some sane defense.
Some light and lifting simple play
To float my math anxiety away.
Blowing bubbles lifts me high
Takes my troubles to the sky.
POIK! They're gone, with all my stress
Bubble therapy is the best.
The label said each time I blew
The average number of bubbles would be at least .
I blew and blew and this I found
Fromblows, they all are round!
But the number of bubbles inblows
Varied widely, this I know.
per blow became the mean
They deviated by , and not.
From counting bubbles, I sure did relax
But now I give to you your task.
Wasa reasonable guess?
Find the answer and pass this test!
The mean age of De Anza College students in a previous term was 26.6 years old. An instructor thinks the mean age for online students is older than 26.6. She randomly surveys 56 online students and finds that the sample mean is 29.4 with a standard deviation of 2.1. Conduct a hypothesis test.
"Red tide" is a bloom of poison-producing algae-a few different species of a class of plankton called dinoflagellates. When the weather and water conditions cause these blooms, shellfish such as clams living in the area develop dangerous levels of a paralysis-inducing toxin. In Massachusetts, the Division of Marine Fisheries (DMF) monitors levels of the toxin in shellfish by regular sampling of shellfish along the coastline. If the mean level of toxin in clams exceeds (micrograms) of toxin per kg of clam meat in any area, clam harvesting is banned there until the bloom is over and levels of toxin in clams subside. Describe both a Type and a Type error in this context, and state which error has the greater consequence.
According to the N.Y. Times Almanac the mean family size in the U.S. is . A sample of a college math class resulted in the following family sizes:
At level, is the class’ mean family size greater than the national average? Does the Almanac result remain valid? Why?
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