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kherson [118]
3 years ago
5

Elena is conducting an experiment to determine if the high school students are more relaxed when the lights are off or when musi

c is played during an exam. She selects 10 of her friends to take an exam with the lights off and another 10 of her friends to take an exam with music playing.
Required:
What is problematic about the way that Elena selected her groups?
Mathematics
1 answer:
Sedaia [141]3 years ago
4 0

Answer:

Problematic is that - only one factor should be analysed at a time. However she has considered both.

Step-by-step explanation:

Groups for any experimental study should be selected on the basis of one variable, other factor(s) remaining constant.

In this case, here are two variables - lights on or off, music playing or not playing - effecting relax level during exams.

She selects 10 students for exam with lights off , 10 for exam without music. This is problematic, as at once only lights or only music factor should be considered.

If one group is with light on , other should be with light off. If one group is with music, other should be without music. This mix up of one light off aspect & one music without music is inapt.

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jason and ben are coworkers five years ago jason was 2.5 times as old as ben if ben is 31 how old is jason]
shtirl [24]

Answer:

65

Step-by-step explanation:

if 5 years ago Ben is 26 years old then Jason was 65.

If you multiply 26 by 2.5 then you'll get 65.

8 0
3 years ago
What is the product of :8.5x(-0.8)x(-12)
Dimas [21]

Answer:

The product of 8.5 \times (-0.8) \times (-12) is 81.6

Step-by-step explanation:

Given : 8.5 \times (-0.8) \times (-12)

To Find : Find the product

Solution:

8.5 \times (-0.8) \times (-12)

(-) \times (-) =+

So, 8.5 \times 9.6

81.6

Hence the product of 8.5 \times (-0.8) \times (-12) is 81.6

8 0
3 years ago
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I'd honestly go with forty eight.
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4 years ago
A person invests 4500 dollars in a bank. The bank pays 6.75% interest compounded semi-annually. To the nearest tenth of a year,
sergiy2304 [10]

Answer:

Step-by-step explanation:

We would apply the formula for determining compound interest which is expressed as

A = P(1+r/n)^nt

Where

A = total amount in the account at the end of t years

r represents the interest rate.

n represents the periodic interval at which it was compounded.

P represents the principal or initial amount deposited

From the information given,

P = 4500

A = 6300

r = 6.75% = 6.75/100 = 0.0675

n = 2 because it was compounded 2 times in a year.

Therefore,.

6300 = 4500(1 + 0.0675/2)^2t

6300/4500 = (1 + 0.03375)^2t

1.4 = 1.03375^2t

Taking log of both sides of the equation, it becomes

Log 1.4 = 2t log 1.03375

0.1461 = 2t × 0.0144 = 0.0288t

t = 0.1461/0.0288

t = 5.1 years.

3 0
3 years ago
it takes Zack 15 minutes to walk 7 1\2 blocks to the swimming pool. at this rate, how many blocks can he walk in one minute?​
gayaneshka [121]

Answer:

1/2 of a block

Step-by-step explanation:

Use proportions to solve

7.5 blocks / 15 minutes = x blocks / 1 minute

7.5=15x

x=.5

1. Multiply the numerators by the other's denominator( 7.5*1 will equal to 15*x)( * means times)

2. Isolate x by dividing 7.5=15x by 15 and you will have what x equals.

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3 years ago
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