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motikmotik
3 years ago
10

The average survival time after diagnosis for a certain type of cancer on the standard treatment is two years. A medical researc

her is working on a new treatment. In an early trial, she tries the new treatment on three subjects, who have an average survival time after diagnosis of four years. Although the survival time doubled, the results are not statistically significant, even at the 0.10 significance level, because: the calculation was in error; the researchers forgot to include the sample size. the placebo effect is present, which limits statistical significance. although the survival time has doubled, the actual increase is really two years. the sample size is small.
Mathematics
1 answer:
wolverine [178]3 years ago
4 0

Answer:

The sample size is too small

Step-by-step explanation:

The answer is the last one: the sample size is too small. Since we only got 3 subjects to test, maybe one of them could live for a long time after the diagnosis of Cacer and that made the average survival time go up by a lot.

In order to obtain results with a significance level higher, you need a sample size of at least 20 subjects.

Now lets see why other options wouldnt be good answers:

  • For a small amount of subjects, it is unlikely to have errors in caculation
  • The sample size is given
  • We are not given information about the treatment and we dont even know if the subjects feel more confident with the new treatment. Also, if a Placebo effect works regularly, it shouldnt limit statistical sifgnificance
  • An increase in 2 years is huge in comparison with the previous survival time.

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Joshua spends 25 minutes of each day reading. Let d be the number of days that he reads, and let m represent the total minutes o
zavuch27 [327]

Answer:

The number of days are independent and the total number of minutes are dependent.

The required model for the situation is m=25d

The table is shown below:

Step-by-step explanation:

Consider the provided information.

Joshua spends 25 minutes of each day reading. Let d be the number of days that he reads, and let m represent the total minutes of reading.

We need to determine which variable is independent and which is dependent.

Here, the number of days are independent and the total number of minutes are dependent.

If he spends 25 minutes each day. So the total number of minutes in d days are:

m=25d

The required model for the situation is m=25d

Now make the table which showing the number of minutes spent reading over 7 days.

Substitute the value of d from 1 to 7 in m=25d

Number of days(D)        Minutes(M)

          1                                 25

          2                                 50

          3                                 75

          4                                 100

          5                                 125

          6                                 150

          7                                 175

3 0
2 years ago
One side of trapezoid is 10 inches. The side parallel to this is twice as long as this side. The height is half as long as the g
Vika [28.1K]
The formula for area of a trapezoid is: 1/2 (b1+b2) h
b1=10
b2=10·2=20 because it stated the side parallel is twice as long as the side above
h=10/2=5 because the height is half as long as the give side length
area of the trapezoid is: 1/2 (10+20) 5
(5·10)·5
50·5
area of the trapezoid is 250 in²
4 0
3 years ago
Solve for x -6x-2≥16
pogonyaev

Answer:

D

x is less than or equal to -3

Step-by-step explanation:

I hope I was fast enough ^^

8 0
2 years ago
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Please match the following 3 terms to their definitions.
yan [13]

Answer:

See attached

Step-by-step explanation:

Refer to picture

8 0
2 years ago
Simplify: -14cd-2c^2d^2+15cd+9c^2d^2-15cd
MaRussiya [10]

7c^2d^2-14cd

Hope this helps a bunch!!!!!!!!!!!!

7 0
3 years ago
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