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Illowsky and Dean - Introductory Statistics 1/e (Homework)

James Finch

Statistics, section 2, Fall 2019

Instructor: Dr. Friendly

Current Score : 34 / 35

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

Last Saved : n/a Saving...  ()

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34/35 (97.1%)

  • Instructions

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1. –/6 points IllowskyIntroStat1 1.1.042.HW. My Notes
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–/6
 
A fitness center is interested in the average amount of time a client exercises in the center each week. Define the following in terms of the study. Give examples where appropriate.

  • Part (a)

    Population
        


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2. –/2 points IllowskyIntroStat1 1.2.065.HW. My Notes
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1 2
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–/2
 
Airline companies are interested in the consistency of the number of babies on each flight, so that they have adequate safety equipment. Suppose an airline conducts a survey. Over Thanksgiving weekend, it surveys 6 flights from Boston to Salt Lake City to determine the number of babies on the flights. It determines the amount of safety equipment needed by the result of that study.

  • Part (a)

    Select the things that were wrong with the way the survey was conducted. (Select all that apply.)



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3. –/5 points IllowskyIntroStat1 1.2.073.HW. My Notes
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–/5
 
Name the sampling method used in each of the following situations.

  • Part (a)

    A woman in the airport is handing out questionnaires to travelers asking them to evaluate the airport's service. She does not ask travelers who are hurrying through the airport with their hands full of luggage, but instead asks all travelers sitting near gates and those travelers who are not taking naps while they wait.
        


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4. –/8 points IllowskyIntroStat1 1.3.080.HW. My Notes
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–/8
 
Fifty part-time students were asked how many courses they were taking this term. The (incomplete) results are shown below.
Part-time Student Course Loads
# of Courses Frequency Relative Frequency Cumulative Relative
Frequency
1 25 0.5
2 15
3

  • Part (a)

    Fill in the blanks in the table.
    Part-time Student Course Loads
    # of Courses Frequency Relative Frequency Cumulative Relative
    Frequency
    1 25 0.5
    2 15
    3


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5. –/12 points IllowskyIntroStat1 1.3.082.HW. My Notes
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–/12
 
Nineteen immigrants to the U.S. were asked how many years, to the nearest year, they have lived in the U.S. The data are as follows:
2; 5; 7; 2; 2; 10; 20; 15; 0; 7; 0; 20; 5; 12; 15; 12; 4; 5; 10
The following table was produced:
Frequency of Immigrant Survey Responses
Data Frequency Relative Frequency Cumulative Relative Frequency
0 2
2
19
 		0.1053
2 3
3
19
 		0.2632
4 1
1
19
 		0.3158
5 3
3
19
 		0.1579
7 2
2
19
 		0.5789
10 2
2
19
 		0.6842
12 2
2
19
 		0.7895
15 1
1
19
 		0.8421
20 1
1
19
 		1.000

  • Part (a)

    Fix the errors in the table. (Enter your answers for relative frequency as fractions. Round your answers for cumulative relative frequency to four decimal places.)
    Frequency of Immigrant Survey Responses
    Data Frequency Relative Frequency Cumulative Relative Frequency
    0 2
    2
    19
         		0.1053
    2 3
    3
    19
         		0.2632
    4 1
    1
    19
         		0.3158
    5 3
    3
    19
    7 2
    2
    19
         		0.5789
    10 2
    2
    19
         		0.6842
    12 2
    2
    19
         		0.7895
    15
    20 1.000


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6. –/1 points IllowskyIntroStat1 1.3.086.HW. My Notes
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Refer to the following relative frequency table on hurricanes that have made direct hits on the U.S. between 1851 and 2004. Hurricanes are given a strength category rating based on the maximum wind speed generated by the storm.†
Frequency of Hurricane Direct Hits
Category Number of Direct Hits Relative Frequency Cumulative Frequency
1 109 0.3993 0.3993
2 72 0.2637 0.6630
3 71 0.2601
4 18 0.9890
5 3 0.0110 1.0000
Total = 273
What is the relative frequency of direct hits that were AT MOST a category 3 storm? (Round your answer to four decimal places.)


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7. –/1 points IllowskyIntroStat1 1.3.086.HW.general. My Notes
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Suppose that the following relative frequency table represents hurricanes that have made direct hits on land. Hurricanes are given a strength category rating based on the maximum wind speed generated by the storm.
Frequency of Hurricane Direct Hits
Category Number of Direct Hits Relative Frequency Cumulative Frequency
1 119 0.4132 0.4132
2 82 0.2847 0.6979
3 62 0.2153
4 20 0.9826
5 5 0.0174 1.0000
Total = 288
What is the relative frequency of direct hits that were AT MOST a category 3 storm? (Round your answer to four decimal places.)


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