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harina [27]
3 years ago
10

A researcher is interested in the effects of exercise on mental health and he proposes the following study: Use stratified rando

m sampling to ensure representative proportions of 18-30, 31-40 and 41- 55 year olds from the population. Next, randomly assign half the subjects from each age group to exercise twice a week, and instruct the rest not to exercise. Conduct a mental health exam at the beginning and at the end of the study, and compare the results.
(a) What type of study is this? (observational or experimental study)?
(b) What are the treatment and control groups in this study?
(c) Does this study make use of blocking? If so, what is the blocking variable?
(d) poin Does this study make use of blinding?
Mathematics
1 answer:
Andre45 [30]3 years ago
6 0

Answer:

Step-by-step explanation:

(a) The type of study described in the question is referred to as an experimental study.

(b) The treatment group is the group that exercises 2 times a week, whereas the control group is the group that does not exercise.

(c) Yes, the study under consideration makes use of blocking.

The blocking variables are 18-30-year-olds, 31-40-year-olds, and 41-55year olds.

(d) No, the study under consideration did not make use of blinding because the patients know if they are in the group that exercises or the one that doesn’t.

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Twenty-seven less than twice a number is -1
11Alexandr11 [23.1K]

Answer: 13

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3 years ago
! + 3 − 5 = 0; by completing the square
mylen [45]

Answer:

x = 1.19258 and x = −4.19258

Step-by-step explanation:

The given equation is :

x^2+3x-5=0

Keep x terms on the left and move  the constant to the right side  by adding it on both sides.

x^2+3x=5

Take half of the x term and square it.

(3\times \dfrac{1}{2})^2=\dfrac{9}{4}

then add the result to both sides

x^2+3x+\dfrac{9}{4}=5+\dfrac{9}{4}\\\\(x+\dfrac{3}{2})^2=\dfrac{29}{4}\\\\(x+\dfrac{3}{2})=\sqrt{\dfrac{29}{4}}\\\\x=\dfrac{-3}{2}+\sqrt{\dfrac{29}{4}}\\\\x=\dfrac{-3}{2}-\sqrt{\dfrac{29}{4}}

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6 0
3 years ago
The ratio of band students to choir students is 4:6. There are a total of 60 students in the band and choir. How many students a
xenn [34]

Answer:

24

Step-by-step explanation:

Given that:

The ratio of band students to choir students is 4 : 6.

Total number of students in the band and choir combined = 60

To find:

The number of students in the band = ?

Solution:

First of all, let us understand the meaning of the ratio given.

Ratio of 4 : 6 means there are 4 number of band students for every 6 number of choir students.

Also, number of band students will be in the multiples of 4 only and

number of choir students will be in the multiples of 6 only

Let the total number of band students = 4x

Let the total number of choir students = 6x

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As per question statement, we can write the following equation:

\Rightarrow 4x+6x=60\\\Rightarrow 10x = 60\\\Rightarrow x =6

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