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murzikaleks [220]
3 years ago
6

One way to measure self-discipline is the $1-now or $2-later test (which the researchers call the Delay Choice Task) in which we

see if a subject would decline to accept a dollar bill now when told they could wait a week and get two dollars. Highly self-disciplined adolescents outperformed their more impulsive peers on every academic-performance variable, including report card grades. Which of the following is correct?
A. This study is an experiment, since it was based on a random sample.
B. This study is an observation study since the researchers did not assign the students to one of the self-discipline categories.
C. This study is an experiment, since each subject was classified into a self-discipline category ($1-now or $2-later) and to report card grades.
D. This study is an experiment, since it was based on a random sample
Mathematics
1 answer:
denis23 [38]3 years ago
8 0

Answer:

A. This study is an experiment, since it was based on a random sample.

Step-by-step explanation:

Simple random sampling is a probabilistic sampling procedure that gives each element of the target population and each possible sample of a given size the same probability of being selected.

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Assume the population has a distribution with a mean of 110 and a standard deviation of 8. For a random sample of size 40, find
VARVARA [1.3K]

Answer:

109.33

Step-by-step explanation:

given that the population has a distribution with a mean of 110 and a standard deviation of 8

Sample size n = 40

Std error of sample mean = std dev/square root of sample size

= \frac{8}{\sqrt{40} } \\=1.265

From std normal distribution table we find that 30th percentile for Z is

-0.5244

Corresponding x score =110-0.5244*1.265=109.33663

30th percentile = 109.33663

=109.33

8 0
4 years ago
There are three numbers for the combination to the store’s safe. The first number is 14.The other two numbers can be multiplied
Oduvanchick [21]
1, 24; 2, 12; 3, 8; 4, 6. mix and match for the codes but that's like 100+ combinations and I don't have that kind of time sorry
3 0
3 years ago
What does it mean to say that a number is a perfect square? Give one example of a number that is a perfect square and one that i
lara31 [8.8K]

Answer: when a number is multiplied by itself, it will give you a perfect square.

For example: 5x5= 25 or 4x4= 16.

Step-by-step explanation:

7 0
3 years ago
Anyone know how to solve this?
yuradex [85]

Answer:

<h2>\frac{16}{25}</h2>

Step-by-step explanation:

<h3>( -  \frac{4}{5})^{2}</h3><h3>{( - 1)}^{2}  \frac{ {4}^{2} }{ {5}^{2} }</h3><h3>1 \frac{ {4}^{2} }{ {5}^{2} }</h3><h3>\frac{ {4}^{2} }{ {5}^{2} }</h3><h3>\frac{16}{25}</h3><h3>Hope it is helpful....</h3>
5 0
3 years ago
4 divided by 2/9? If you could, please also explain.
shtirl [24]
You do 4/1 divided by 2/9

4 2
_ divided by _

1 9

Equals 18

(You have to multiply by the reciprocal)

4/1 times 1/4
And
2/9 times 1/4

Hope I helped!!!
7 0
4 years ago
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