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Groebner et al-A Course in Business Statistics 4/e (Homework)

James Finch

Statistics, Fall 2010

Instructor: Dr. Friendly

Current Score : 6 / 17

Due : Saturday, November 13, 2010 23:00 EST

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Question
Points
1 2 3 4 5
3 3 0/2 0/4 0/5
Total
6/17 (35.3%)

Description

Here are some textbook questions from A Course in Business Statistics 4/e by Groebner, Shannon, Fry, and Smith published by Prentice Hall. 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. 3/3 points All Submissions Notes Question: GroeStat4 3.E.024.
Question part
Points
Submissions
1 2 3
1 1 1
1/50 1/50 1/50
Total
3/3
 
Assume the following sample represents vehicle speeds.
51 43 58 67 67 69 40 52
66 44 47 41 41 45 47 41
(a) Determine the proportion of this data set that is within one standard deviation of the mean.
Enter a number.
Your answer is correct.
(b) Determine the proportion of this data set that is within two standard deviations of the mean.
Enter a number.
Your answer is correct.
(c) Determine the proportion of this data set that is within three standard deviations of the mean.
Enter a number.
Your answer is correct.


2. 3/3 points All Submissions Notes Question: GroeStat4 5.E.076.
Question part
Points
Submissions
1 2 3
1 1 1
1/50 1/50 1/50
Total
3/3
 
When only the value-added time is considered, the time it takes to build a laser printer is thought to be uniformly distributed between 7 and 16.2 hours.
(a) What are the chances that it will take more than 10 value-added hours to build a printer?
Enter a number.
Your answer is correct.
(b) How likely is it that a printer will require fewer than 9 value-added hours?
Enter a number.
Your answer is correct.
(c) Suppose a single customer orders two printers. Determine the probability that the first and second printer each will require fewer than 9 value-added hours to complete.
Enter a number.
Your answer is correct.


3. 0/2 points All Submissions Notes Question: GroeStat4 7.E.052.
Question part
Points
Submissions
1 2
0/1 0/1
1/50 1/50
Total
0/2
 
A bank in Midland, Texas, is interested in estimating the proportion of customers who have credit cards with one or more other banks. A simple random sample of 310 customers showed that 106 have these credit cards. If the bank wishes the estimate to be made with a 95% confidence level, what are the upper and lower limits of the confidence interval estimate?
(
Enter a number.
Your answer is incorrect.,
Enter a number.
Your answer is incorrect.)

4. –/4 points Notes Question: GroeStat4 8.E.009.
Question part
Points
Submissions
1 2 3 4
0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50
Total
0/4
 
Determine the p-value for each of the following hypothesis scenarios.
(a) H0: = 1346 versus Ha: 1346 and z = 2.12
Enter a number.

(b) H0: 4000 versus Ha: 4000 and z = -1.93
Enter a number.

(c) H0: 24.78 versus Ha: 24.78 and z = 0.89
Enter a number.

(d) H0: 200 versus Ha: 200 and z = -2.2
Enter a number.


5. –/5 points Notes Question: GroeStat4 12 .E.030.
Question part
Points
Submissions
1 2 3 4 5
0/1 0/1 0/1 0/1 0/1
0/50 0/50 0/50 0/50 0/50
Total
0/5
 
You are given the following summary statistics from a regression analysis.
= 200 + 150x
SSE = 22.50
SSX = Sum of Squares x=99645
n=18
x=52.0
(a) Determine the point estimate for y if xp = 29 is used.
Enter a number.

(b)Provide a 95% confidence interval estimate for average y, given xp = 29.
(
Enter a number.
,
Enter a number.
)
(c)Provide a 95% prediction interval estimate for a particular y, given xp = 29.
(
Enter a number.
,
Enter a number.
)

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