Evaluating Data reports

which one is not able to work ?

• Randomly choose three students from each of the 36 after-school activities for the survey.

• Randomly select 100 students from the honor roll list to survey.

• Randomly select half of each grade for the poll.

• Randomly select 20 freshmen, 20 sophomores, 30 juniors, and 30 seniors for the survey

Based on the information in the graphs, which of the following statements statements is a valid conclusion ?

• Summer temperatures in England decreased from 1275 to 1375

• England's average yearly temperature was lower in 1700 than in 1725

• It is likely that temperatures in England will not exceed 9°C in 2025

• it is likely that England's average yearly temperature will not drop below 8°C in 2025

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?

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

• 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 valid because the scaling on both axes is appropriate.

Which of these is the best method for Javier to collect his data ?

• Randomly select 20 students from both the girls' and boys' soccer team

• Randomly select 10 freshmen, 10 sophomores, 10 juniors, and 10 seniors

• choose any 3 buses, and randomly select a total of 40 students from those buses

• Number all students in the school, and randomly select the numbers of 40 students

Which of these best describes why this is a misuse of statistics?

• The graph should not include the years where the cost stayed the same

• The years should be placed on the horizontal axis to show how the average cost of a school lunch changes over time

• A line of best fit should be used instead of a line graph

• The cost of a school lunch is actually decreasing

Which of these is the best method for the school to use to conduct its survey?

• Assign a different number to each student, and select 30 students using a random number generator.

• Assign a different number of each student, and select 15 males and 15 females using a random generator

• Assign a different number to each student who has been at the school for at least one year and select 30 students using a random number generator

• Assign a different number to each student whose age is 16 years or older, and select 30 students using a random generator

Which of these methods provides the most representative sample ?

• Survey 50 randomly selected residents in its viewing area.

• Survey 50 randomly selected people who leave a video rental store.

• Survey 50 randomly selected people who enter the television station.

• Survey 50 randomly selected residents from the local telephone book.

The mayor of the town used the graph to claim the between 1970 and 2000 the number of new houses built increased at a constant rate. Is the claim valid ?

• it is not valid because the graph shoes a constant rate of change

• It is valid because 30 years is long enough to evaluate the increase

• It is not valid because the scale on the horizontal axis is inappropriate

• It is not valid because the scale on the vertical axis is inappropriate