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Johnson & Kuby - Elementary Statistics 10/e (Homework)

James Finch

Statistics, section 2, Fall 2019

Instructor: Dr. Friendly

Current Score : 20 / 25

Due : Sunday, January 27, 2030 23:30 EST

Last Saved : n/a Saving...  ()

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20/25 (80.0%)

  • Instructions

    Here are some textbook questions from Elementary Statistics 10/e by Robert Johnson and Patricia Kuby published by Brooks/Cole Publishing. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and allows you to try another version of the same question for practice.

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1. –/6 points JKEStat10 3.E.017. My Notes
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Growth charts are commonly used by a child's pediatrician to monitor a child's growth. Consider the growth chart that follows.
(a) What are the two variables shown in the graph? (Select all that apply.)



(b) What information does the ordered pair (4.5, 90) represent?
= 4.5
= 90

(c) Describe how the pediatrician might use this chart and what types of conclusions might be based on the information displayed by it. (Select all that apply.)

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2. –/4 points JKEStat10 6.E.020. My Notes
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–/4
 
Consider the following. (Give your answers correct to four decimal places.)
(a) Find P(-2 < z < 0.00).


(b) Find P(-1.85 < z < 2.11).


(c) Find P(z < -1.51).


(d) Find P(z < -0.42).


You may need to use the appropriate table in Appendix B to answer this question.
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3. –/4 points JKEStat10 8.E.039. My Notes
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–/4
 
A certain adjustment to a machine will change the length of the parts it makes but will not affect the standard deviation. The length of the parts is normally distributed, and the standard deviation is 0.5 mm. After an adjustment is made, a random sample is taken to determine the mean length of parts now being produced. The resulting lengths are as follows.
74.4 75.1 74.1 76.1 74.8 75.4 76.2 74.2 75.9 76.2

(a) What is the parameter of interest?
    


(b) Find the point estimate for the mean length of all parts now being produced. (Give your answer correct to two decimal places.)
mm

(c) Find the 0.99 confidence interval for μ. (Give your answer correct to three decimal places.)
( , )


You may need to use the appropriate table in Appendix B to answer this question.
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4. –/6 points JKEStat10 11.E.014. My Notes
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–/6
 
A manufacturer of floor polish conducted a consumer-preference experiment to determine which of five different floor polishes was the most appealing in appearance. A sample of 100 consumers viewed five patches of flooring that had each received one of the five polishes. Each consumer indicated the patch he or she preferred. The lighting and background were approximately the same for all patches. The results are given below. Solve the following using the p-value approach and solve using the classical approach.
Polish A B C D E Total
Frequency 24 18 16 20 22 100
(a) State the hypothesis for "no preference" in statistical terminology.
    

(b) What test statistic will be used in testing this null hypothesis?
    


(c) Complete the hypothesis test using α = 0.10.
(i) Find the test statistic. (Give your answer correct to two decimal places.)


(ii) Find the p-value. (Give your answer bounds exactly.)
< p <
(iii) State the appropriate conclusion.
    


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5. –/5 points JKEStat10 12.E.011. My Notes
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–/5
 
Consider the following table for a single-factor ANOVA.
Level of Factor
Replicates123
1336
2027
3034
(a) Find x1,2.


(b) Find x2,1.


(c) Find C1.


(d) Find x.


(e) Find (Ci )2.


You may need to use the appropriate table in Appendix B to answer this question.
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