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avanturin [10]
3 years ago
6

A French teacher was interested in determining if a foreign language computer program could help students learn better. She deci

ded to randomly put students into two groups. One group would use the computer program and the other group would use traditional methods. The group that used the computer program scored an average of 84 on the first test. The other group that used traditional methods scored an average of 80 on the first test. She will use the information from these two groups to improve her teaching for all students that she sees. Which of the following is true regarding the numbers "80" and "84"?a) Both 84 and 80 are parameters.b) 84 is a statistic; 80 is a parameterc) 84 is a parameter; 80 is a statisticd) Both 84 and 80 are statistics.
Mathematics
1 answer:
ExtremeBDS [4]3 years ago
5 0

Answer:

D

Step-by-step explanation:

The 84 and 80 are both statistics since they are a sample of the whole population of target and parameter refers to a study that involves using the whole target population.

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Christy rode her bike 60 miles in 5 hours. (A) what was her average speed in miles per hour?
Rufina [12.5K]

Answer:

12mph

Step-by-step explanation:

Christy rode 60 miles in 5 hours.

60/5 = 12 miles per hour

3 0
3 years ago
Read 2 more answers
If twice a number is increased by 5 and this sum is multiplied by -3, the result is -57 . What is the number?
cupoosta [38]
Set it up like this, going from words on the page to letters and variables:
-3(2x+5) = -57. Twice a number is 2x, increased by 5 is 2x+5, and that is multiplied by -3 to get a total of -57. Distribute the -3 into the parenthesis to get -6x - 15 = -57. Move the 15 over by addition to get -6x = -42. Divide both sides by -6 to get that x = 7
6 0
3 years ago
1) Give an example of a rational number AND an irrational number. Explain how someone could tell the difference between your two
harina [27]

Answer:

1. Ratoinal= 2

irrrational= 8.34284

A rational number can be put into a fraction while an irrational cannot.

My irrational number is a never-ending decimal that never repeats and my rational number is a whole number.

2.I don't know what it means to terminate. If I convert my rational number into a decimal no it does not repeat any digits because the decimal form of 2 would just be 2.0

3. A repeating decimal can be written and a rational number because it can be put into a fraction. ex; 4/9 is a fraction and in decimal, form it is 0.444444444...

Step-by-step explanation:

3 0
3 years ago
According to a recent​ survey, the population distribution of number of years of education for​ self-employed individuals in a c
strojnjashka [21]

Answer:

a) n=100,\,\mu_s = 14.7, \,\sigma_s=0.32

b) n=400,\,\mu_s = 14.7, \,\sigma_s=0.16

c) "a.The mean of the sampling distribution stays the same, but the standard error decreases."

Step-by-step explanation:

a) We have a population with mean of 14.7 and standard deviation of 3.2.

We have to calculate the parameters of the sampling distribution (mean and standard deviation), for a sample size of n=100.

The mean for the sampling distribution is the same of the population:

\mu_s=\mu=14.7

The standard deviation of the sampling distribution is related to the population standard deviation by the inverse of the square of the sample size:

\sigma_s=\sigma/\sqrt{n}=3.2/\sqrt{100}=3.2/10=0.32

b) For a sample size of n=400, the mean is the same (14.7), but the standard deviation becomes:

\sigma_s=\sigma/\sqrt{n}=3.2/\sqrt{400}=3.2/20=0.16

c) "a.The mean of the sampling distribution stays the same, but the standard error decreases."

As we calculated, the standard error decreases as the sample size increases. This is because the variability of the variable is reduced as the sample size is bigger.

The mean stays the same independently of the sample size.

7 0
3 years ago
What is equivalent to the equation to 1/4 (8 + 6z + 12) ?
Fed [463]
1/4 (8 + 6z + 12) 

------------------------------------------------------------
Combine like terms :
------------------------------------------------------------
1/4 (6z + 20)

------------------------------------------------------------
Apply distributive property :
------------------------------------------------------------
1/4(6z) + 1/4(20)
3/2z + 5

------------------------------------------------------------
Answer: 3/2z + 5
------------------------------------------------------------
7 0
3 years ago
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