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Johnson & Kuby-Elem. Statistics, Essentials 10/e (Homework)

James Finch

Statistics, section 2, Fall 2019

Instructor: Dr. Friendly

Current Score : 23 / 28

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

Last Saved : n/a Saving...  ()

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    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. –/8 points JKEssStat10 1.AE.005. My Notes
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EXAMPLE 1.5
Applying the Basic Terms

A statistics student is interested in finding out something about the average dollar value of cars owned by the faculty members of our college. Each of the eight terms used in Statistics can be identified in this situation.

  1. The is the collection of all cars owned by all faculty members at our college.

  2. A is any subset of that population. For example, the cars owned by members of the mathematics department is a sample.

  3. The is the "dollar value" of each individual car.

  4. One is the dollar value of a particular car. Mr. Jones's car, for example, is valued at $9400.

  5. The are the set of values that correspond to the sample obtained (9400; 8700; 15,950; . . .).

  6. The consists of the methods used to select the cars that form the sample and to determine the value of each car in the sample. It could be carried out by questioning each member of the mathematics department, or in other ways.

  7. The about which we are seeking information is the "average" value of all cars in the population.

  8. The that will be found is the "average" value of the cars in the sample.

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2. –/2 points JKEssStat10 2.AE.002. My Notes
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EXAMPLE 2.2
Pareto Diagram of Hate Crimes
The FBI reported the number of hate crimes by category for 2003 (http://www.fbi.gov/ucr/ucr.html#hate). The in Figure 2.3 shows the categorized hate crimes, their percentages, and cumulative percentages.

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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 (3, 87) represent?
= 3
= 87

(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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4. –/4 points JKEssStat10 6.E.034. My Notes
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Find the two standard scores (z) that correspond to the following. (Enter your answers from smallest to largest. Give your answers correct to two decimal places.)
(a) The middle 74% of a normal distribution is bounded by them.
and

(b) The middle 88% of a normal distribution is bounded by them.
and


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

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Consider the following. (Give your answers correct to two decimal places.)
(a) Find z(0.15).


(b) Find z(0.27).


(c) Find z(0.73).


(d) Find z(0.91).


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

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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.
74.6 75.7 74.4 76.6 74.8 75.8 76.4 74.2 75.9 75.5

(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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