# Unit IV Test

21 Questions

Using recursion in Models and Decision Making (Section A-B)

• 1.
Data was collected scores from the same class period of students. Students were presented with the same exact test. On Monday they were given the paper test and on Friday they were given the computer test.   Paper Test Computer Test 72 45 73 38 75 41 76 35 77 31 78 40 79 25 80 32 80 36 81 29 82 34 83 38 84 26 85 32 86 28 88 27
A) Calculate the correlation coefficient, r. B) Create a table chart with all calculations.
• 2.
Which of the following is an arithmetic sequence?
• A.

1, 2, 4, 7, 13, ...

• B.

1, 2, 3, 6, 9 ...

• C.

1, 2, 4, 6, 8 ...

• D.

1, 2, 4, 8, 16 ...

• 3.
A best-fit line drawn on a scatter plot _______________ .
• A.

Approximates the linear relationship of data points

• B.

Always has a positive slope

• C.

Must be drawn through the first and last data points

• D.

Is the line that goes through every data point

• 4.
The scatter plot below shows the women's winning marathon times and the high temperatures on the marathons days. Which predication equation best shows how marathon times and temperature are related?
• A.

Y = - (1/8)x + 140

• B.

Y = (1/8)x - 140

• C.

Y = (1/8)x + 140

• D.

Y = 140

• 5.
A best-fit line is drawn on a scatter plot showing the average daily temperature and the number of people at a public swimming pool. The slope of the line would probably be ________________.
• A.

Zero

• B.

Undefined

• C.

Negative

• D.

Positive

• 6.
The correlation seen in the graph below would best described as:
• A.

High positive correlation

• B.

Low positive correlation

• C.

High negative correlation

• D.

Low negative correlation

• 7.
For 10 days, Taylor kept a record of the number of hours he spent listening to music. The information is shown in the table below.   Day 1 2 3 4 5 6 7 8 9 10 Hours 9 3 2 6 8 6 10 4 5 2
Which scatter plot shows Taylor's data graphically?
• A.
• B.
• C.
• D.
• 8.
A scatterplot is _________________________.
• A.

A line graphed in a portion of Q1 of the coordinate plane.

• B.

A set of data graphed as ordered pairs in a coordinate plane.

• C.

A table of set data.

• D.

A line graph.

• 9.
The correlation coefficient, r, can take on any value within what range?
• A.

R ≥ 1

• B.

0 ≤ r ≤ 1

• C.

-1 ≤ r

• D.

-1 ≤ r ≤ 1

• 10.
True or False: When data is graphed and a positive correlation is observed, the first set is always causing the affect seen in second set of data.
• A.

True

• B.

False

• 11.
Match the following
• A. r = .12
• A.
• B. r = .56
• B.
• C. r = -.15
• C.
• D. r = -.49
• D.
• E. r = .81
• E.
• F. r = -.78
• F.
• 12.
Name   _____________________________
• 13.
The population of Redville grew from 5432 in 1990 to 7116 in 2000. Assuming the population is growing exponentially, predict the population of Redville in 2005.
• A.

• B.

• C.

• D.

• 14.
Match the following exponential functions  A)    B)  C)   D)    Which formula is an exponential decay?
• 15.
Match the following exponential functions  A)    B)  C)   D)    Which formula is an exponential growth?
• 16.
If r = 0, there is a linear correlation.
• A.

True

• B.

False

• 17.
Julie bought a house for \$100,000 five years ago. If the value of the house has appreciated 5% per year, how much is it worth now? Round to the nearest tenths.
• A.

\$ 127,628.15

• B.

\$ 759,375.00

• C.

\$ 127,628.16

• D.

\$ 127,268.16

• 18.
After graduation your parents gave you \$1,500. You planned on saving \$1,000 into a CD. You walked in to a bank the following day and told a banker you would like to have \$2,000 after three years. The financial bank said their CD rates changes 1.6% every year and it's average rate is 9.4% and advises you will meet you goal. Do you agree?
• A.

Yes

• B.

No

• C.

There's not enough information to determine.

• 19.
Match the following arithmetic sequences using the explicit rule...  an = a1 + (n – 1)d  for the following problems. -15, -13, -11, -9,…
• A. What is the common difference?
• A.
• B. What is the next term?
• B.
• C. What is the 7th term?
• C.
• 20.
What is the 50th term of the arithmetic sequence 3, 7, 11, 15, ...
• A.

53

• B.

151

• C.

199

• D.

203

• 21.
A car bought for \$13,000 depreciates at 12% per annum. What is its value after 7 years?
• A.

\$5463.15

• B.

\$5312.78

• C.

\$5312.79

• D.

\$5546.78

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