Question

which of the following graphs best shows a strong negative association between d and t? a) graph with points scattered b) graph with points scattered c) graph with points scattered d) graph with points scattered ---statistics class miles traveled by air passengers in country x, 1960 to 2005 according to the line of best fit in the scatter - plot above, which of the following best approximates the year in which the number of miles traveled by air passengers in country x was estimated to be 550 billion? a) 1997 b) 2000 c) 2003 d) 2008 the graph below shows the total number of music album sales, in millions, each year from 1997 through 2009. based on the graph, which of the following best describes the general trend in music album sales from 1997 through 2009? a) sales generally increased each year since 1997. b) sales generally decreased each year since 1997. c) sales increased until 2000 and then generally decreased. d) sales generally remained steady from 1997 through 2009. swimming time versus heart rate michael swam 2,000 yards on each of eighteen days. the scatter - plot above shows his swim time for and corresponding heart rate after each swim. the line of best fit for the data is also shown. for the swim that took 34 minutes, michaels actual heart rate was about how many beats per minutes less than the rate predicted by the line of best fit? a) 1 b) 2 c) 3 d) 4

Explanation:

1. First question (scatter - plot for negative association)

Step1: Recall negative - association concept

In a scatter - plot, a negative association means that as one variable increases, the other variable decreases.

Step2: Analyze each option

Option A shows a random scatter of points with no clear trend. Option B shows a weak positive trend. Option C shows a strong positive trend. Option D shows a strong negative trend where as \(d\) increases, \(t\) decreases.

Step1: Locate 550 billion on the y - axis

Find the value of 550 billion on the "Number of miles traveled (billions)" axis of the scatter - plot.

Step2: Read the corresponding year

Draw a horizontal line from 550 billion until it intersects the line of best fit, then draw a vertical line down to the x - axis (Year) to read the year. The year is approximately 2003.

Step1: Observe the graph

Look at the "Annual Music Album Sales" graph. The sales start around 600 million in 1997, increase until around 2000, and then start to decrease.

Answer:

D

2. Second question (air - passenger miles)