CR practice EOC #1-12

• (-8,-2)
• 6
• (-8,2)
• 12
• (8,-2)
• 18
• (8,2)
• 36

A survey of 40 randomly selected males and 40 randomly selected females shows that, on average, males spend 0.6 more hours watching television than females. In order to determine if this difference is statistically significant, the researcher uses advanced statistical techniques to run a simulation of this situation 100 times.

Let M = Average time males spend watching television

Let W = Average time females spend watching television

Let N = M – W

The results are displayed in the graph to the left.

Based on the results of these simulations, at the 0.05 level of significance, is there statistically significant evidence that males watch more television than females?.

• There is evidence that males watch more television than females because a difference of 0.6 occurred only 1% of the time

• There is evidence that males watch more television than females because a difference of 0.6 or greater occurred only 2% of the time.

• There is not evidence that males watch more television than females because a difference of 0.6 or greater occurred 2% of the time.

• There is not evidence that males watch more television than females because a difference of 0.6 or greater occurred 6% of the time.

Triangle PMT is shown to the left.

mGH= x + 3

mPG= 4x+1

mGJ= 2x-1

What is the measure of segment PG?

• 4 units

• 7 units

• 14 units

• 17 units

The rectangle FGHI, diagonals FH and GI intersect at E.

IE= 3x+4

EG= 5x-6

What is the length of FH?

• 5 units

• 10 units

• 19 units

• 38 units

What is the value of 3h(2) + 4g(1)?

• 39

• 28

• 10

• -6

The police chief of a town is trying to determine the average speed of drivers on a specific road.

·       The police chief took a random sample of the speeds of 100 drivers on the road.

·       The mean was 48.5 miles per hour, with a standard deviation of 2.5 miles per hour.

·       The police chief wanted to decrease the margin of error of his next sample.

Which choice would decrease the margin of error?

• decreasing the sample size

• increasing the sample size

• changing the time that the data is collected

• changing the road on which the data is collected

The equation of the graph is shown to the left.

Which equation represents the graph?

• y = |x|-2

• y = |2x| -2

• y = |x-2|

• y = |2x-2|