Answer:
a) Statistic.
b) The population proportion is expected to be between 0.29 and 0.31 with a 94% degree of confidence.
Step-by-step explanation:
a) The proportion of 30% is a statistic, as it is a value that summarizes data only from the sample taken in the study from USA Today. Other samples may yield different proportions.
b) We can use the statistic to estimate a confidence interval for the parameter of the population.
The standard error for the proportion is calculated as:

The margin of error is 0.01. We can use this value to determine the level of confidence that represents.
The formula for the margin of error is:

This z-value, according to the the standard normal distribution, corresponds to a confidence interval of 94%.
The interval for this margin of error is:

Then, we can conclude that the population proportion is expected to be between 0.29 and 0.31 with a 94% degree of confidence.
Hi there! :)
<u>Answer:</u>
Donovan babysat for 7 hours on Saturday in order to earn $31.50.
Step-by-step explanation:
In order for you to answer your question, you'll need to use the cross product method:
$9 → 2 hours
$31.50 → X hours
<u>(2 × 31.50)</u> ÷ 9 = X hours
<u>63 ÷ 9</u> = X hours
<u>7 = X hours</u>
There you go! I really hope this helped, if there's anything just let me know! :)
Answer:
C.) All squares are rectangles
Step-by-step explanation:
Rectangles
-4 sides
-the length of opposite sides are equal
-the opposite sides are parrallel to each other
-all angles in a rectangle are 90°
Squares have all the characteristics needed in a rectangle
There are 45 green beads
<em><u>Solution:</u></em>
Let the number of red beads be "x"
Given that, Carrie has 3 times as many green beads as red beads
Number of green beads = 3 times number of red beads
Number of green beads = 3x
<em><u>She 2 as many blue beads as green beads</u></em>
Number of blue beads = 2 times the number of green beads
Number of blue beads = 2(3x) = 6x
<em><u>She has 150 total</u></em>
Therefore,
Number of red beads + Number of green beads + Number of blue beads = 150
x + 3x + 6x = 150
10x = 150
x = 15
Thus, number of green beads = 3x = 3(15) = 45
Thus there are 45 green beads