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andrew11 [14]
3 years ago
11

A researcher wanted to determine whether eating hamburgers for lunch increased the aggression of second graders during their aft

ernoon play period. after feeding a group of 20 students hamburgers for lunch she observed that, on average, the students committed 2.5 aggressive behaviors during their afternoon play period. in this example, which of the following describes the sample?
A The 2.5 aggressive behaviors
B The 20 students the researcher observed
C All second graders
D All second graders who ate hamburgers for lunch
Mathematics
1 answer:
VashaNatasha [74]3 years ago
6 0

Answer:

B: The 20 students the researcher observed

Step-by-step explanation:

The aim of the research was to determine whether eating hamburgers increased the aggression of second graders during their afternoon play period. The one that best described this sample is definitely the ones that the researcher chose for the basis of the research which are the 20 students because their reactions towards the hamburger justifies and gives the study direction

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ikadub [295]
8x+6+4= 3x- 2x- 4 is the correct step
8 0
3 years ago
The number of freshmen entering college in a certain year is 621. What type of data is 621?
horrorfan [7]

Answer:  Third option is correct.

Step-by-step explanation:

Since we have given that

The number of freshmen entering college in a certain year = 621

It is considered as discrete data.

Since we know the definition of Discrete which refers to all types of data which take only numerical values.

It is based on counts.

According to question, we have given the exact number of freshmen instead of any range or interval.

Hence, Third option is correct.

3 0
3 years ago
A football quarterback enjoys practicing his long passes over 40 yards. He misses the first pass 40% of the time. When he misses
laila [671]

Answer:

Probability of missing two passes in a row is 0.08.

Step-by-step explanation:

Event E = A football player misses twice in a row.

P(E) = ?

Event X = Football player misses the first pass

P(X) = 0.4

Event Y = Football player misses just after he first miss

P(Y) = 0.2

Both the events are exclusive so the probability of occuring of these two events can be calculated by the formula:

P(E) = P(X).P(Y)

P(E) = 0.4*0.2

P(E) = 0.08

4 0
3 years ago
A number is called evil if it has 666 in it. How many 7 digit numbers are evil?
defon

Step-by-step explanation:

There are 5 different positions of 666:

666////

/666///

//666//

///666/

////666

The forward dashes represent any number from 0 to 9.

Case 1: "666////"

Number of ways = 10⁴ = 10,000.

Case 2: The other positions.

Since the 1st forward dash cannot be 0 (leading digit),

Number of ways for each position = 9 * 10³ = 9,000

Number of ways for all 4 positions = 9,000 * 4 = 36,000.

Total evil numbers = 10,000 + 36,000 = 46,000.

5 0
2 years ago
9 x 7 = ( x 7) – (1 x 7)<br> = 70-<br> =
WARRIOR [948]

Answer:

63

Step-by-step explanation:

9x7=(10x7)-1x(7)

=70-7

=63

8 0
3 years ago
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