Algebra 1-2 DA Name______

Data Unit Test In-class Review

1. Vocabulary: Match the definition with the correct word.

  1. The part of a population that is surveyed
/ Frequency
  1. A sample in which every element has an equal chance of being selected
/ Random sample
  1. A sampling error that cause one option to seem better than the other
/ Correlation
  1. To conclude or decide from something known or assumed
/ Bivariate Data
  1. A set of data that has two variables
/ Infer
  1. A numerical value that reflect the relationship between two variables
/ Statistics
  1. The degree of relation correspondence between two sets of data
/ Sample
  1. When a change in one quantity causes a change in a second
/ Bias
  1. The number of times the value appears in the data set
/ Causation
  1. The ratio of the number of times an event occurs
/ Two way table
  1. A table listing two categorical variables whose values have been paired
/ Relative frequencies
  1. Facts or data of number kind assembled classified an tabulated so as to present significant information about a given subject
/ Correlation coefficient

2) Identify the relationship between the two quantities in the given question as causation or correlation.

a. The number of additional calories consumed and the amount of weight gained.

b. The age of a child and his/her shoe size.

c. Thenumber of cars traveling over a busy holiday weekend and the number of accidents reported.

d. The amount of rainfall and the level of water in the lake.

3) The following graph depicts the relationship between the number of mice in a barn and the number of cats in a barn.

A. The data represents which type of correlation?

a. Weak

b. Positive

c. Negative

d. None

B. Which statement can be concluded about the data?

a. There is a causation between number of cats and the number of mice but not necessarily correlation.

b. More cats cause fewer mice.

c. There is no correlation between the number of cats and the number of mice.

d. There is a correlation between the number of cats and the number of mice but not necessarily causation.

C. Draw in a line of best fit.

D. Explain why you think the line is a good fit.

4) Identify sample as biased or unbiased

a. Trevor is outside a local Toyota dealership taking a survey on the most popular car.

b. Monique survey’s people at the mall to determine the most popular television show.

c. Kyle is at Pacer’s game and is taking a survey on people’s favorite NBA team.

d. The city survey’s the community about a new round-about using a telephone survey .

5) The question you are investigating is: Are you willing to pay higher taxes to build a new youth soccer stadium? Which group of people could be used to obtain an unbiased sample for this question?

a. people at a soccer game

b. people at a retirement seminar

c. people at a mall.

6) Use the following scenario to answer the questions:

A town mayor wants to know if the residents of a town are bothered by the noise at a local amusement park.He surveys 50 residents living in the neighborhood located next to the park.

a. What is the bias is this scenario?

b. Whose interests might be served in this scenario?

7) Tell whether the correlation coefficient for the data is positive, negative or no correlation.

8) Use the graph at the right to answer the following questions:

a. Choose two points on the graph so that a line through them closely represents the pattern of all the points on the graph.

( ____, ____ ) and ( ____, ____ )

b. Draw the line on your graph.

c. Use the two points to calculate the slope.

d. Write an equation in point-slope formusing your slope and a point

e. Now write your equation in slope-intercept form.

8) The data is summarized in a two-way table for the age and the number of accidents per year. Complete the table first. Then calculate the percentage to the nearest tenth.

Age / Accidents per year
1 / 2 / 3 / Total
17-25 / 15 / 23 / 40
26-40 / 50 / 44 / 56
Above 40 / 62 / 22 / 11
Total

______Calculate percentage of drivers with 2 accidents.

______Calculate percentage of drivers 17-25 with 3 accidents.

______Calculate percentage of drivers above 40.

______Calculate percentage of drivers 26-40 with 1 accident.

______Calculate percentage of drivers with 1 accident.

______Calculate percentage of drivers above 40 with 2 accidents.

______Calculate percentage of drivers 17-25 with 1 accident.

______Calculatepercentage of drivers 26-40 with 3 accidents.

______Calculate percentage of drivers 26-40.

______Calculate percentage of drivers above 40 with 3 accidents.

______Calculate percentage of drivers 26-40 with 2 accidents.

______Calculate percentage of drivers 17-25.

______Calculate percentage of drivers with 3 accidents.