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shtirl [24]
3 years ago
6

Suppose the poll in the previous question was conducted by email, and those conducting the survey are concerned about the possib

ility of undercoverage, since some people do not use email or have filters that block mass emails. Which of the following is the best way for them to correct for this source of bias (a) Throw this sample out and start over again with a better sampling method. (b) Use a higher confidence level, such as 99%. (c) Use a lower confidence level, such as 80%. (d) Use a t-interval instead of a z-interval. (e) Take a larger sample.
Mathematics
1 answer:
mr_godi [17]3 years ago
3 0

Answer:

Throw this sample out and start over again with a better sampling method

Step-by-step explanation:

Biased sampling leads wrong results, since the sample doesn't represent the population which is aimed to be surveyed. Higher/lower confidence level or t distribution cannot correct it.

Confidence level gives the probability of rejecting null hypothesis while it is true. And t-interval is used when the sample size is small or population standard deviation is unknown.

Before choosing confidence level or type of the statistic to infer results, one must follow random sampling not biased.

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A. A 5in radius ball is in a
abruzzese [7]

Answer:

52.33%

Step-by-step explanation:

Since, all six sides of the box are touching the ball.

So, all the three dimensions of the box are equal.

Hence, it is a cubical box.

Side length of the box (l)

= diameter of the ball

= 2*radius of the ball

= 2*5

= 10 In.

V_{ball} = \frac{4}{3} \pi r^3

V_{ball} = \frac{4}{3} \times 3.14(5)^3

V_{ball} = \frac{4}{3} \times 3.14\times 125

V_{ball} = \frac{1,570}{3}\: In^3

V_{box} =l^3

V_{box} =(10)^3

V_{box} =1000\: In^3

Percentage of the space in the box occupied by the ball

= \frac{V_{ball}}{V_{box} } \times 100

= \frac{\frac{1,570}{3}}{1000} \times 100

= \frac{1570}{3000} \times 100

= \frac{157}{3}

= 52.33\%

5 0
3 years ago
List a pair of vertical angles, then state the relationship between vertical angles ​
strojnjashka [21]

Answer:

6, 8

7, 9

1, 4

they are congruent (same angle measure)

5 0
3 years ago
Read 2 more answers
The ratio of three angles of a triangle is 1:2:3. Find the measurement of the angles
Snezhnost [94]

Answer:

all the angles add up to 180 degrees

So 180÷6=30

(i got 6 cuz 1+2+3)

so 1=30

2=30*2=60

3=30*3=90

     

8 0
3 years ago
Help find the answer for problem number 4
Olin [163]
Adult ticket (a) = $5
Child ticket (c) = $2

785 tickets = $3280

a + c = 785 tickets
5a + 2c = $3280

c = 215 child tickets
a = 570 adult tickets

570 + 215 = 785 tickets
5(570) + 2(215) = $3280

There were 215 child tickets sold on Saturday



3 0
3 years ago
What is the factored form of m2 + - 27n2
Illusion [34]
2(m-27n) this is the answer
3 0
3 years ago
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