There are two congruent triangles that are being formed from the lamppost, the light, the ground and the man. Always try to draw a picture for these types of problems. It helps a lot when solving. Your answer should be about 4.3ft
50 PTS for answer!! I need help! "Work this one out," said Monica to her colleague. "I drive from my home to the office every mo
1 answer:
You might be interested in
Answer:
The confidence interval for the difference in proportions is
No. As the 95% CI include both negative and positive values, no proportion is significantly different from the other to conclude there is a difference between them.
Step-by-step explanation:
We have to construct a confidence interval for the difference of proportions.
The difference in the sample proportions is:
The estimated standard error is:
The z-value for a 95% confidence interval is z=1.96.
Then, the lower and upper bounds are:
The confidence interval for the difference in proportions is
<em>Can it be concluded that there is a difference in the proportion of drivers who wear a seat belt at all times based on age group?</em>
No. It can not be concluded that there is a difference in the proportion of drivers who wear a seat belt at all times based on age group, as the confidence interval include both positive and negative values.
This means that we are not confident that the actual difference of proportions is positive or negative. No proportion is significantly different from the other to conclude there is a difference.
Answer:
C. Those who have a car tend to have a cell phone.
Step-by-step explanation:
The relative frequency for a data set n is calculated by dividing each frequency by n.
We have a table that relates the use of cars and cell phones.
First, we take from the table the population that has a car.
Then, of the students who have a car, 12 have a cell phone and 6 do not have a cell phone.
Then we calculate the relative frequencies for those who have a cell phone and those who do not.
______________________________________________
Relative frequency Students with car n = 18.
-------------------------------------------------- --------------------------------------
C<em>ell phone No cell phone Total n</em>
12/18 6/18 18
_______________________________________________
_______________________________________________
Relative frequency Students with car n = 18.
-------------------------------------------------- --------------------------------------
C<em>ell phone No cell phone Total n</em>
0.666 0.333 18
________________________________________________
Most students who have a car also have a cell phone.
Now we calculate the relative frequency for students who do not have a car.
_______________________________________________
Relative frequency Students without a car n = 7
-------------------------------------------------- --------------------------------------
<em>Cell phone No cell phone Total n</em>
2/7 5/7 7
_______________________________________________
_______________________________________________
Relative frequency Students without a car n = 7
-------------------------------------------------- --------------------------------------
<em>Cell phone</em> <em> No</em> <em>cell phone Total n</em>
0.286 0.714 7
_______________________________________________
Most students who do not have a car do not have a cell phone either.
<em>Then these data suggest that. Those who have a car tend to have a cell phone.</em>
Option C