A research group interested in understanding the effect of listening to classical music on learning mathematics conducted a study. One hundred students were randomly assigned to one of two groups. The first group listened to classical music as they learned a new lesson. The second group learned the same lesson with no music playing. Both groups were tested on the new material to determine how much they learned. The results for the two groups were compared. What kind of study is this?This is an observational study because students were randomly assigned to groups.
This is an observational study because a treatment was applied to both groups.
This is an experiment because a treatment was applied to a group.
This is an experiment because students were able to choose which group to join.

Answers

Answer 1

Answer: First of all, this is not an observational study, but an experiment, since we have two groups and one of the two groups is manipulated or treated. In an observational study the subjects are only observed.

Second, the students did not choose their groups - so we can't choose the last answer.

Therefore the correct answer is:
This is an experiment because a treatment was applied to a group.

Answer 2

Answer:

Answer:

This is an experiment because a treatment was applied to a group.

Step-by-step explanation:

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Mandy,Jeremy, and Lily went to am amusement park during their summer vacation. Mandy spent $16.25 at the amusement park. Jeremy spent $3.40 more than Mandy spent. Lily spent 2 times as much money as Jeremy spent. How much money did Lily spend at the amusement park?

Answers

SInce Jeremy spent 3.40 more that MAndy you do:
16.25 + 3.40 =19.65
Since Lily spent twice as much as Jeremy:
19.65 *2 = 39.30
Lily spent $39.30 at the amusement park

Jana uses 20 cards to play a memory game the cards are either animal cards or fruit cards. The ratio of animal cards to fruit cards is 2:3 How many if the 20 cards are animal cards? Of the fruit cards, 1/3 have bananas on them. How many cards have bananas on them. Show or explain your work.

Answers

Given that,

Total no of cards = 20

The ratio of animal cards to fruit cards is 2:3

No of animal cards = 20

Solution,

Let there are 2x animal cards and 3x fruit cards. ATQ,

2x+3x = 20

5x = 20

x = 4

Animal cards = 2x

= 2(4)

= 8

Fruit cards = 3x

= 3(4)

= 12

It is also mentioned that, of the cards, 1/3 have bananas on them. It means,

$B=(1)/(3)* 12\n\n=4$

Hence, 4 cards have bananas on them.

Based on the diagram, which statement is accurate?A) m∠GDE = m∠FDE
B) m∠GDE < m∠FDE
C) m∠DEG < m∠DEF
D) m∠DFE > m∠DGE

Answers

Answer:

Answer choice C.

Step-by-step explanation:

A plane is an undefined term because

Answers

A place is an undefined term because it is described generally, not using a formal definition.

Hope this helped :)

Answer:

is described generally, not using a formal definition

I TOOK THE TEST JUST NOW AND GOT IT RIGHT

Step-by-step explanation:

Please answer all three questions for full points.

Answers

Answer:

Step-by-step explanation:

1. a) vertical stretch by a factor of 5 and

e) reflection over x-axis

2. c) reflection over the y-axis

e) horizontal shift to the right 4 units

3. c) horizontal shift

Mr. and Mrs. Ferguson are planning a vacation to celebrate their anniversary.Mrs. Ferguson is considering reserving a room at the Abraham Hotel. The Abraham Hotel charges $239 a night.

Mrs. Ferguson calculates that 6 nights will cost $1450. What is the percent error in Mrs. Ferguson’s calculation? Round to the nearest percent. Show your work.

HELP ME

Answers

First, let's calculate the actual cost.
$239*6=1434$ is the actual cost of six nights.
The formula for percent error is $|(measured value-accepted value)/(accepted value)|*100$
The bars (|) stand for absolute value which gets rid of the negative sign if there is one.
Plug in the values: $|(1434-1450)/(1450)|*100$
$|(-16)/(1450)|*100$
$|-0.0110344828|*100$
$0.0110344828*100$
$1.10344828%$ is the percent error.

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