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Zolol [24]
3 years ago
12

"Suppose that a committee is studying whether or not there is waste of time in our judicial system. It is interested in the mean

amount of time individuals waste at the courthouse waiting to be called for jury duty. The committee randomly surveyed 81 people who recently served as jurors. The sample mean wait time was 7 hours with a sample standard deviation of 2.2 hours."
a. Define the random variables X and X- in words.
b. Which distribution should you use for this problem? Explain your choice.
c. Construct a 95% confidence interval for the population mean time wasted.
d. Explain in a complete sentence what the confidence interval means.
Mathematics
1 answer:
Digiron [165]3 years ago
7 0

Answer:

See Explanation Below

Step-by-step explanation:

Given

n = sample size = 81

u = mean wait time = 7 hours

σ = standard deviation = 2.2 hours

a

X is wait time per individual

X- is the mean of the sample means of size 81

b. Normal distribution

It's a distribution that occurs naturally in many situations; and it fits many natural phenomena. an example is given in the question above.

c.

x-bar = 7

To calculate the Margin of Error (ME)

For confidence Interval of 95%, the margin of error M.E = 1.96σ/√n

Where n = 81

M.E = 1.96 * 2.2 /√81

M.E = 0.48

So, the confidence Interval is given as follows

95% CI: 7-0.48 < u < 7+0.48

95% CI: 6.52 < u < 7.48

d. We are 95% confident that the population mean waiting time is

between 6.52 and 7.48 hours

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Answer:

Correct answer is option <em>D)</em> Construct the bisector of an angle.

Step-by-step explanation:

Angle bisector of an angle is a line that divides the angle in two equal parts.

A Line <em>BD</em> is called the angle bisector of \angle ABC if

\angle ABD = \angle CBD

Please refer to image attached.

As per the question image, if the line PW is joined it will be the angle bisector of \angle QPR.

Steps of construction of angle bisector:

1. Draw the angle QPR.

2. Open compass and make an arc that will cut the two lines on points Q and R respectively as shown in question figure.

3. With the same compass opening, put the compass on Q and make an arc in the area between \angle QPR.

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So, Correct answer is option <em>D)</em> Construct the bisector of an angle.

6 0
3 years ago
A rectangle has vertices E(-4, 8), F(2, 8), G(2, -2) and H(-4, -2). The rectangle is dilated with the origin as the center of di
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Answer:

The dilation on any point of the rectangle is P'(x,y) = \frac{5}{2}\cdot P(x,y).

Step-by-step explanation:

From Linear Algebra, we define the dilation of a point by means of the following definition:

G'(x,y) = O(x,y) +k\cdot [G(x,y)-O(x,y)] (1)

Where:

G(x,y) - Coordinates of the point G, dimensionless.

O(x,y) - Center of dilation, dimensionless.

k - Scale factor, dimensionless.

G'(x,y) - Coordinates of the point G', dimensionless.

If we know that O(x,y) = (0,0), G(x,y) =(2,-2) and G'(x,y) =(5,-5), then scale factor is:

(5,-5) = (0,0) +k\cdot [(2,-2)-(0,0)]

(5,-5) = (2\cdot k, -2\cdot k)

k = \frac{5}{2}

The dilation on any point of the rectangle is:

P'(x,y) = (0,0) + \frac{5}{2}\cdot [P(x,y)-(0,0)]

P'(x,y) = \frac{5}{2}\cdot P(x,y) (2)

The dilation on any point of the rectangle is P'(x,y) = \frac{5}{2}\cdot P(x,y).

5 0
2 years ago
which statement is true regarding the graphed functions F(0) = 2and g(-2) = 0 f(0) = 0and g(-2) = 4 f(2) =0and g(-2)= 0 f(-2)= 0
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Answer:

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4 0
3 years ago
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5 0
2 years ago
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If 79.5% of married couple households are both native and 13.2% are both foreign, then (a) what percentage of married couple hou
Zanzabum

Answer:

The correct solution is "7.3%".

Step-by-step explanation:

It seems that the given question is incomplete. Find below the attachment of the complete and appropriate query.

According to the question,

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where,

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Now,

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7 0
3 years ago
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