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Makovka662 [10]
3 years ago
12

A student researcher conducts an experiment that investigates the effects of a new mathematics website on student achievement. S

he randomly assigns students to two groups: one that receives supplemental instruction from the website and one that doesn't receive the supplemental instruction. Each sample consists of 20 students. Observations of student engagement are rated by the researcher, according to an engagement scale. How could this study be improved?
Select all that apply.

A.
Have another researcher provide ratings, as well.

B.
Administer a quiz or exam that gauges student understanding.

C.
Increase the sample size.

D.
Limit observations to students who are engaged.
Mathematics
2 answers:
pickupchik [31]3 years ago
8 0

Answer:

A, B and C

Step-by-step explanation:

A. Adding another researcher to provide ratings will make the study less biased.

B. A quiz or exam will show which students have a better understanding of the math material. Better quiz or exam results show that the site is more effective for a student with or without the supplemental instruction.

C. Having a greater sample size is better because a greater scope of students is covered. Different students have different abilities and learning preferences.

MrRissso [65]3 years ago
7 0

Answer:

A. - Have another researcher provide ratings, as well.

B. - Administer a quiz or exam that gauges student understanding

C. - Increase the sample size.

Step-by-step explanation:

Option A is correct because additional researchers help identify and eliminate bias in individuals.

Option B would be very helpful in obtaining quantitative data on students improvement.

Option C will also improve the study because larger sample sizes mean more accurate results.

Option D is NOT correct, as limiting observations to students who are engaged eliminates the control group and makes it so that there is no baseline, rendering the experiments results almost meaningless.

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On a cold day, hailstones fall with a velocity of 2i − 6k m s−1 . If a cyclist travels through the hail at 10i m s−1 , what is t
Paraphin [41]

Answer:

The velocity of the hail relative to the cyclist is V_{hc}=-8\hat{i}-6\hat{k}

The angle at which hailstones falling relative to the cyclist is \theta = 36.86^\circ

Step-by-step explanation:

Given : On a cold day, hailstones fall with a velocity of 2\hat{i}-6\hat{k}\text{ m/s} . If a cyclist travels through the hail at 10\hat{i} \text{ m/s}.

To find : What is the velocity of the hail relative to the cyclist and At what angle are the hailstones falling relative to the cyclist?

Solution :

The velocity of the hailstone falls is V_h=2\hat{i}-6\hat{k}\text{ m/s}

The velocity of the cyclist travels through the hail is V_c=10\hat{i} \text{ m/s}

The velocity of the hail relative to the cyclist is given by,

V_{hc}=V_h-V_c

Substitute the value in the formula,

V_{hc}=2\hat{i}-6\hat{k}-10\hat{i}

V_{hc}=-8\hat{i}-6\hat{k}

So, The velocity of the hail relative to the cyclist is V_{hc}=-8\hat{i}-6\hat{k}

Now, The angle of hails falling relative to the cyclist is given by

\theta = \tan^{-1}(\frac{-6}{-8})

\theta = \tan^{-1}(\frac{3}{4})

\theta = 36.86^\circ

So, The angle at which hailstones falling relative to the cyclist is  \theta = 36.86^\circ

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Answer:

Kela will be able to travel for 7 stops before her money runs out.

Step-by-step explanation:

Since Kela wants to visit a friend who lives 8 kilometers away, and she'll ride the subway as she can before walking the rest of the way, and she needs to buy an access pass that costs $ 5.50 and there is also a fee of $ 1.25 for each stop, if Kela doesn't want to spend more than $ 15 on the trip, to determine the largest number of stops she can afford, the following calculation must be performed:

(15 - 5.5) / 1.25 = X

9.5 / 1.25 = X

7.6 = X

Therefore, Kela will be able to travel for 7 stops before her money runs out.

4 0
3 years ago
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