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HSA 2009 Using Data to Make Predictions
供稿人: Dyson

The table below shows the number of words a

student typed during five timed sessions.

Which equation best models a line of best fit for

these data?

 

 w = 3m + 60
 w = 102m − 117
 w = 60m + 3
 w = −117m + 102

Based on the results of the simulation, what is the

total number of people out of 150 who would need to

buy less than 10 boxes of cereal to get all 5 prizes?

A box of cereal contains 1 of 5 different prizes.

A simulation was conducted to predict how many

boxes of cereal must be bought in order to get all

5 prizes. The results of 30 trials are shown in the 

stem-and-leaf plot on the next slide.

 

  15

    3

    5

  30

The population for the years 1996 to 2005 of a

small town is shown on the graph on the next slide. 

It is valid because the scaling on both axes is appropriate.

It is valid because the scaling on the vertical axis is appropriate.

 It is not valid because the scaling on both axes is inappropriate.

 It is not valid because the scaling on the horizontal axis is inappropriate.

Based on the graph, the mayor states that the

population of the town increased at a steady rate for

the years 1996 to 2005. Which of the following

statements is true about the mayor’s conclusion?

The median misrepresents these test scores because 100 is an

       extreme value.

The mean represents these test scores because it is the middle value of

      these test scores.

The median represents these test scores because it is the value that occurs

      the most.

 The mean misrepresents these test scores because 100 is an

        extreme value.

The test scores for the nine students in Mrs. Miller’s

history class are shown below.

68   69   70   71   71   72   72   72   100

Which of the following statements is true about the

test scores?

The table shows the cost of health care,

in millions of dollars, from 1996 to 2001. 

The equation of a line of best fit for this data is

y = 30x + 474, where x represents the number

of years since 1996 and y  represents the cost of

health care, in millions of dollars. Which statement

best describes the meaning of the slope of this

equation?

The cost of health care increased by

      $474,000,000 per year since 1996.

The cost of health care increased by $30

      per year since 1996.

 The cost of health care increased by

      $30,000,000 per year since 1996.

The cost of health care increased by $474

       per year since 1996.

The owner of a store wants to decide when to close the store after 4 p.m. The table

below shows the median profit of the store for five time intervals during

a six-month period.  Based on the data in the table, at which of these times should

the owner close the store to maximize profit?

 6:00 p.m.
 5:00 p.m.
 7:00 p.m.
 9:00 p.m.

Minh used the graph on the next slide to show that the

average cost of a school lunch is increasing at a rapid

rate.  Which of these best describes why this is a

misuse of statistics?

 The years should be placed on the horizontal axis

     to show how the average cost of a school lunch

     changes over time.

The cost of a school lunch is actually decreasing.

A line of best fit should be used instead of a

    line graph.

The graph should not include the years where

    the cost stayed the same.

A teacher collects data to show the relationship

between the number of student absences (x) and the

grade a student earns (y). Using the data, the teacher

determines the equation for the line of best fit, as

shown below.

y = −0.25x + 4

The teacher then uses the equation to predict the

letter grade that a student earns. This relationship is

shown on the next slide.

What is the letter grade for a

student that has 4 absences?

  A

  B 

  C

  D

A school has 750 students. A randomly selected

sample of 100 students was asked to name their

favorite class. The results are shown in the table

on the next slide.

 

Based on the survey results, what is the total number

of students at the school who will choose science as

their favorite class?

  12

  16

  75

  90

Based on the survey

results, what is the

total number

of students at the

school who will

choose science as

their favorite class?

The cafeteria manager is going to start selling cookies

at lunch. She surveyed 300 randomly selected students

on their cookie preferences. The survey results are

shown in the table on the next slide. 

She needs cookies for 1,640 students. Based on the

survey results, if each student buys one cookie,

what is the total number of vanilla creme cookies she

should buy? Round the answer to the nearest

whole number.

She needs cookies for 1,640 students. Based on the survey results, if each

student buys one cookie, what is the total number of vanilla creme cookies she

should buy? Round the answer to the nearest whole number.

   67

   12

  366 

  734

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