Copy in Agenda

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Copy in Agenda

• Unit 4 Test tomorrow

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Unit 4 Review

• Copy each problem in your notes, showing all work
  requested.
• Raise your hand when you have the correct answer.
• If you need help you must show me your notes
  first before I will answer any questions.

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Review Problem 1

• What is the difference between a measure of
  center and a measure of variability?

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Review Problem 2

• How can you determine if a sample is valid or
  invalid?

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Review Problem 3

• Use the data below to complete the table.
• McCleskey - 11,12,15,15,19,23,24
• Palmer - 12,13,13,14,15,18,18,21

Statistical Measure McCleskey Palmer
mean
median
mode
range
First quartile
Third quartile
Interquartile Range
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Review Problem 4

• Find the mean absolute deviation for McCleskey.
• McCleskey - 14,15,18,18,20,21,25
• Mean - 17

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Review Problem 5

• Ms. Mourdock took a survey of the students in her
  classes to see how many students are going to
  attend the school dance. She surveyed 28
  students, and 14 said they would attend. If the
  school has 320 students, how many students might
  Ms. Mourdock expect to attend the dance? (hint
  set up a proportion)

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Review Problem 6

• In a poll of Mrs. Richards math class, 75 of
  the students say that math is their favorite
  academic subject. The yearbook staff wants to
  have a special page dedicated the students
  favorite subject. Explain why this is not a valid
  conclusion. How could the yearbook staff gather
  better data to determine which subject is most
  popular.

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Review Problem 7

• A survey was conducted of customers at Brewsters
  Ice Cream to determine the which flavor is the
  most popular. Of the 100 people surveyed, 20 like
  vanilla, 9 like strawberry, 21 like chocolate, 30
  like mint, 12 like peach and 8 like rocky road.
  What is the sample size?

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Review Problem 8

• Dr. Whittle runs several days each week. The
  number of miles she runs each week for the last
  five weeks is shown below
• 25, 22, 24, 26, 18
• Based on the data, what is a reasonable
  prediction of the total number of mile Dr.
  Whittle runs in one year?

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Review Problem 9

• The two data sets below depict random samples of
  the salaries of two companies. Based on the data
  below which measure of center will provide the
  most accurate estimation of the salaries for each
  company?
• Company A 2 million, 200,000, 250,000,
  225,000, 150,000
• Company B 5 million, 150,000, 250,000,
  200,000, 175,000

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Review Problem 10

• The total number of minutes of homework assigned
  to 7th and 8th grade students each week was
  collected. Compare the variability by comparing
  the mean absolute deviations of each grade.
• 7th 5, 10, 10, 15, 20, 25
• 8th 5, 10, 15, 15, 25, 30

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Review Problem 11

• Given the following data sets, determine which
  set has the greatest interquartile range.

Set 1 Set 2 Set 3 Set 4
Minimum 10 15 20 5
Q1 15 20 30 15
Median 35 45 40 65
Q3 40 50 50 75
Maximum 50 60 55 80
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Review Problem 12

• Give the mean, median, and mode of each set of
  data.

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Review Problem 13

• How do the medians of the two sets of data
  compare?

Store A Store A Store A   Store B Store B Store B
20 26 27   20 21 23
28 28 29   25 26 26
29 32 32   31 33 33
33 35 37   34 38 39
38 39     39 42  
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Review Problem 14

• Jamie is taking a survey to find out the most
  popular type of food in Marietta. Why would the
  surveying customers leaving Olive Garden not be a
  representative sample?

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Review Problem 15

• Use the data provide to answer the following
• Which group has the highest range? Median? Total
  price?
• Can you determine the price of the most expensive
  house in each city from the data given?

  Kennesaw Marietta
Mean 190 175
Median 140 115
Mode 160 100
Range 350 475
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Review Problem 16

• Based on the samples, what generalizations can be
  made?

  Public Private
First Quartile 35,000 58,000
Median 42,000 70,000
Third Quartile 54,000 84,000
A. Graduates from private universities made at least 58,000 per year.
B. The median earnings for public university graduates is 28,000 more than the median earnings for private university graduates.
C. The top twenty-five percent of both the public and private university graduates earned more than 50,000 annually.
D. The interquartile range for public universities is 19,000 more than the interquartile range for private universities.
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Review Problem 17

• The table below shows minutes of studying of 20
  female 7th students and 20 male 7th grade
  students for the Unit 4 test. Does this data
  suggest any differences between males and
  females? Create box plots and compute and compare
  the minimums, medians, and maximums to support
  your answer.

Females Females Females Females Males Males Males Males
84 98 112 120 82 106 116 126
88 98 114 120 94 106 122 126
90 102 116 124 98 110 124 128
94 104 118 124 100 110 124 136
94 108 118 132 104 112 124 162