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jenyasd209
13 days ago
8

A tooth-whitening gel is to be tested for effectiveness. A group of 85 adults have volunteered to participate in the study. Of t

hese, 43 are to be given a gel that contains the tooth-whitening chemicals. The remaining 42 are to be given a similar-looking package of gel that does not contain the tooth-whitening chemicals. A standard method will be used to evaluate the whiteness of teeth for all participants. Then the results for the two groups will be compared. 1. After the treatment period, compare the whiteness of the 43 treated adults. 2. A placebo is not being used. 3. After the treatment period, compare the whiteness of the two groups. 4. Randomly select 85 adults to be given the treatment gel. 5. The remaining 42 adults receive the placebo gel. 6. Randomly select 43 adults to be given the treatment gel.
Mathematics
1 answer:
babunello [8.4K]13 days ago
5 0

Response:

(a) 3, 5, and 6

Detailed explanation:

In this study, 43 participants will be treated with a gel containing tooth-whitening agents, while the remaining 42 will receive a placebo. Consequently, a placebo is in use.

The selection process for the 43 individuals receiving the gel will be random.

Post-experiment, the whiteness levels of both groups will be compared to analyze the gel's effect.

For true randomness in the experiment, options 3, 5, and 6 are applicable.

(b)

In order for the experiment to be double-blind, the evaluators analyzing the whiteness, as well as the participants, must not know which individuals were given the whitening gel versus the placebo.

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The accurate statements are 0.75 (x,y) = (0.75x, 0.75y), LM is parallel to L'M', and "the vertices of the image are nearer to the origin relative to the pre-image".

Explanation:

It is stated that the triangle ABC underwent dilation as per the rule DO,0.75 (x,y)

DO, 0.75(x,y) signifies the dilation rule, where both x and y values are scaled by 0.75, indicating that the dilation, centered around the origin, has a scale factor of 0.75. The representation for this dilation would be,

(x,y)\rightarrow (0.75x,0.75y)

Consequently, the first statement holds true.

Since both x and y coordinates are scaled down by 0.75, the sides of the image are parallel, but shorter, with a scale of 0.75 compared to the pre-image’s sides.

Thus, the second statement "LM is parallel to L'M'" is also accurate, while the third and fifth statements are incorrect.

The scale factor of 0.75, being less than 1, suggests that the vertices of the image are closer to the origin compared to those of the pre-image.

Hence, the fourth statement "The vertices of the image are nearer to the origin compared to the pre-image" is indeed correct.

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6 days ago
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Santa Claus is assigning elves to work a shift making toy trucks. Apprentice elves draw a wage of forty candy canes per shift, b
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Answer:

link:

Step-by-step explanation:

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1 month ago
Problem Select three ratios that are equivalent to 11:111:111, colon, 1. Choose 3 answers: Choose 3 answers: (Choice A) A 1:111:
Inessa [9000]

Answer:

(Choice B) B 22:222:222, colon, 2

(Choice C) C 55:555:555, colon, 5

(Choice D) D 99:999:999, colon, 99

Step-by-step explanation:

Three ratios that correspond to 11:111:111

(Choice A) A 1:111:111, colon, 11

By dividing by 1

= 1: 111: 111

(Choice B) B 22:222:222, colon, 2

Dividing by 2

= 11: 111: 111

(Choice C) C 55:555:555, colon, 5

Dividing by 5

= 11: 111: 111

(Choice D) D 99:999:999, colon, 99

Dividing by 9

= 11: 111: 111

(Choice E) E 110:10110:10

Dividing by 10

11: 1011: 1

The corresponding ratios are:

(Choice B) B 22:222:222, colon, 2

(Choice C) C 55:555:555, colon, 5

(Choice D) D 99:999:999, colon, 99

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16 days ago
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Answer:

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a reduction in the price of alternative vegetable oils alongside an influx of olive oil producers into the market

type 2

a news report suggesting that olive oil consumption enhances health along with a decline in the supply of olives due to a disappointing harvest

Step-by-step explanation:

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Answer:

The correct selection is 1.

Step-by-step explanation:

The histogram indicates that

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In the 14-18 age category, 4 students are included.

This implies that the ages of 7 students fall within the 5-10 range, 5 students within the 11-13 range, and 4 students within the 14-18 range.

The total count in the dataset is 7+5+4=16

In options 3 and 4, the counts in the datasets are fewer than 16. Hence, options 3 and 4 are invalid.

Option 2 exclusively contains data within the 5-10 range, making it incorrect as well.

In option 1,

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5-10                    5,6,7,8,9,10,10           7

11-13                  11,11,12,12,13            5

14-18                    14,14,15,16              4

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