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qaws [65]
3 years ago
10

An energy drink company claims that its product increases students' memory levels. To support its claims, the company issues adv

ertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. The missing component in this study is a
A) control group B) sample group C) population D) test group
Mathematics
2 answers:
dexar [7]3 years ago
8 0
A) control group, they did not also survey 10 other ppl who took a placebo 
gladu [14]3 years ago
3 0

Answer: A) control group


Step-by-step explanation:

  • A control group is a group of participants who are used for comparing another group to in a test or experiment. It is composed of participants who do not receive the experimental treatment.

In the given situation an energy drink company claims that its product increases students' memory levels.

To support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory.

But they haven't compose a control group to compare the results for test.

You might be interested in
Find the missing values X and Y on the triangle below
alexira [117]

Answer:

Step-by-step explanation:

The total angle is 180 so 180 is 95 is 75

x=75

A traingle has a total of 180

180-50-75=55

y=55

6 0
2 years ago
A supervisor finds the mean number of miles that the employees in a department live from work. He finds x Overbar = 29 and s = 3
podryga [215]

The correct option is (B).24 miles.

Z-score is basically another term for the specific number of standard deviations. I suppose we can assume normality here, even though it isn't given, so I'd make a rough sketch.

Otherwise, just use the basic formula:

z_{score} =\dfrac{x-\mu}{\sigma}

 Given that,

\bar{x}=29 (statistic for a mean) and s=3.6 (statistic for a standard deviation).

Since z-score must be Less than 1.5, So

1.5> \dfrac{x-29}{3.6}\\

1.5 \times3.6 > x-29\\5.4+29> x\\34.4> x

I just used normal cdf and got 23.6.

Hence the correct option is (B).24 miles.

For more details on z score follow the link:

brainly.com/question/13299273

 

4 0
2 years ago
What is the value of x?
tiny-mole [99]
Very simple:
As the sides that subtend the angle x are of equal lengths and are joined to form a triangle, we know the only other angle (the blank one) is going to also be 56° and since angles in a triangle always add up to 180°, we just have to do:
180 - (2 × 56) = 68°
3 0
3 years ago
In August, a grocery store averaged about 620 customers per day. In September, the average number of customers per day at the st
Nadusha1986 [10]
For these types of questions you normally do the new amount - original amount / the original. So 1075-620/620 which gives you 73.39%.
8 0
3 years ago
Why are fractions difficult to teach and learn? Give 5 reasons.
lakkis [162]

Answer:

It is not hard

Step-by-step explanation:

•Once you get familiar with the lesson you understand it in a much easier way by doing problems pretty often

•If you want get more comfortable with it just search for a few questions in internet specifically educational platforms in schools like teachers

•But if your still confused you can always study it for free by byjus or vedantu and the best option in my opinion is ask your teacher to explain it once more

•It is very hard to solve questions if you are not freindly with the chapter

• Do not hesitate to ask questions if your doubting or anything you might face problems in higher grades with the topic

5 0
3 years ago
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