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Gravetter - Essentials of Statistics 6/e (Homework)

James Finch

Statistics, Fall 2010

Instructor: Dr. Friendly

Current Score: 6/21

Due: Saturday, October 30, 2010 23:00 EDT

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Question
Points
1 2 3 4 5 6 7 8 9 10 11
0/1 0/1 0/1 0/1 0/1 1 1 0/1 0/1 4/8 0/4
Total
6/21

Description

Here are some textbook questions from Essentials of Statistics for the Behavioral Sciences 6/e by Frederick J. Gravetter published by Wadsworth.

Questions 1 is a simulation question.

Questions 2-5 are tutorial questions.

Questions 6-11 are test bank questions.

Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. –/1 points Notes Question: GWEssStat6 3.Sim.01.
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2. –/1 points Notes Question: GWEssStat6 1.Tut.01.
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To receive credit, you must enter the correct answer in the blue box, click Submit for Credit, then click OK in the pop-up box. Use the Tutor Steps for help in finding the right answer.



3. –/1 points Notes Question: GWEssStat6 1.Tut.02.
Question part
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To receive credit, you must enter the correct answer in the blue box, click Submit for Credit, then click OK in the pop-up box. Use the Tutor Steps for help in finding the right answer.



4. –/1 points Notes Question: GWEssStat6 3.Tut.01.
Question part
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To receive credit, you must enter the correct answer in the blue box, click Submit for Credit, then click OK in the pop-up box. Use the Tutor Steps for help in finding the right answer.



5. –/1 points Notes Question: GWEssStat6 5.Tut.01.
Question part
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To receive credit, you must enter the correct answer in the blue box, click Submit for Credit, then click OK in the pop-up box. Use the Tutor Steps for help in finding the right answer.



6. 1/1 points All Submissions Notes Question: GWEssStat6 6.TB.002.
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A random sample requires that
    

Your answer is correct.



7. 1/1 points All Submissions Notes Question: GWEssStat6 6.TB.004.
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A jar contains 10 red marbles and 20 blue marbles. A random sample of n = 3 marbles is selected from the jar. If the first two marbles are both blue, what is the probability that the third marble will be red?
    

Your answer is correct.



8. 0/1 points All Submissions Notes Question: GWEssStat6 6.TB.010.
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What proportion of a normal distribution is located in the tail beyond a z-score of z = –1.00?
    

Your answer is incorrect.



9. 0/1 points All Submissions Notes Question: GWEssStat6 6.TB.047.
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A random sample of 2 marbles is obtained from a jar containing 10 red marbles and 20 blue marbles. If the first marble selected is red, then the probability that the second marble will be blue is p = 20/29.
    

Your answer is incorrect.



10. 4/8 points All Submissions Notes Question: GWEssStat6 6.TB.072.
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If a vertical line is drawn through a normal distribution at each of the following z-score locations, then determine whether the tail is on the left side or the right side of the line and determine what proportion of the distribution is located in the tail. (Round all answers to four decimal places.)
(a) z = +2.00
    

Your answer is correct.


p =
Enter an exact number.
Your answer is incorrect.

(b) z = +0.75
    

Your answer is correct.


p =
Enter an exact number.
Your answer is incorrect.

(c) z = -0.50
    

Your answer is correct.


p =
Enter an exact number.
Your answer is incorrect.

(d) z = -1.25
    

Your answer is correct.


p =
Enter an exact number.
Your answer is incorrect.


11. 0/4 points All Submissions Notes Question: GWEssStat6 6.TB.075.
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The average employee in the U.S.A. spends µ = 23 minutes commuting to work each day. Assume that the distribution of commute times is normal with a standard deviation of σ = 8 minutes. (Round the answers for z to the nearest hundredth and the answers for p to four decimal places.)
(a) What proportion of U.S. employees spend less than 15 minutes a day commuting?
z =
Enter an exact number.
Your answer is incorrect.
p =
Enter an exact number.
Your answer is incorrect.

(b) What is the probability of randomly selecting an employee who spends more than 35 minutes commuting each day?
z =
Enter an exact number.
Your answer is incorrect.
p =
Enter an exact number.
Your answer is incorrect.

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