1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alenkinab [10]
3 years ago
8

A school district decides to compare a new math textbook with the textbook that has been used for the past few years. Each of th

e fourth graders in one school is randomly assigned to be in one of two classes, one in which a teacher continues using the old book and another in which a new teacher uses the new book. The school administrators compare the average scores of the two classes on a mathematics standardized test at the end of the year to determine which book is better.Which of the following is a potential confound in this study?a. Both classes have children who report that they do not like math.b. The teachers have different amounts of teaching experience.c. The standardized test is graded incorrectly.d. There are different children in fourth grade this year than there were last year.
Social Studies
1 answer:
GarryVolchara [31]3 years ago
4 0

Answer:

B. The teachers have different amounts of teaching experience.

Explanation:

The teachers having different amounts of teaching experience is the only problem that varies systematically along with the textbook version, so it is the only one that could be a confound. The Longer a teacher teaches a particular Course the more vast and learned he/she becomes and the more experience he/she becomes. He will know methods and things to do to ensure that the students understands better. Unlike a teacher that doesn't have much experience. So both of them handling the same course will definitely yield different results.

You might be interested in
There are number of ways _ can help the society to be strong, united and peaceful.<br><br>​
likoan [24]

Answer:

1. You?

2. People?

Explanation:

4 0
2 years ago
Who was the first president to speak at a national ffa convention
Paladinen [302]
In 1953 President Dwight D. Eisenhower became the first President to speak at a National FFA Convention.
5 0
3 years ago
What should you see in your rear-view mirror before you attempt to return to the right lane after you pass a vehicle on the left
Hitman42 [59]

Before returning to the proper lane, sign and have a look at your interior rearview mirror and ensure you can see the front bumper of the car you just exceeded.

Before you return to the right lane, signal and observe your indoor rear-view reflect and make certain you can see the front bumper of the automobile you surpassed. appearance quickly over your right shoulder to make certain that you can see as minimum numerous toes of pavement between your vehicle and the only you exceeded.

One way to do this is to search for the vehicle for your internal rearview reflection. whilst you may see each headlight in your rearview replicate, you may have enough room to return to your riding lane. everything out the back automobile window the identical manner you could see it in case you turned round to appearance.

Learn more about rearview here

brainly.com/question/2821478

#SPJ4

4 0
1 year ago
What feature of the Roman Empire continued in the Byzantine Empire?
REY [17]

Answer:

The FitnessGram™ Pacer Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The 20 meter pacer test will begin in 30 seconds. Line up at the start. The running speed starts slowly, but gets faster each minute after you hear this signal. Ding  A single lap should be completed each time you hear this sound. Ding  Remember to run in a straight line, and run as long as possible. The second time you fail to complete a lap before the sound, your test is over. The test will begin on the word start. On your mark, get ready, ding

Explanation:

6 0
3 years ago
Read 2 more answers
What do you think caused dinosaurs to become extinct.
Orlov [11]

The Cretaceous-Tertiary extinction event, or the K-T event, is the name given to the die-off of the dinosaurs and other species that took place some 65.5 million years ago. For many years, paleontologists believed this event was caused by climate and geological changes that interrupted the dinosaurs’ food supply. However, in the 1980s, father-and-son scientists Luis (1911-88) and Walter Alvarez (1940-) discovered in the geological record a distinct layer of iridium–an element found in abundance only in space–that corresponds to the precise time the dinosaurs died. This suggests that a comet, asteroid or meteor impact event may have caused the extinction of the dinosaurs. In the 1990s, scientists located the massive Chicxulub Crater at the tip of Mexico’s Yucatán Peninsula, which dates to the period in question.

Dinosaurs roamed the earth for 160 million years until their sudden demise some 65.5 million years ago, in an event now known as the Cretaceous-Tertiary, or K-T, extinction event. (“K” is the abbreviation for Cretaceous, which is associated with the German word “Kreidezeit.”) Besides dinosaurs, many other species of mammals, amphibians and plants died out at the same time. Over the years, paleontologists have proposed several theories for this extensive die-off. One early theory was that small mammals ate dinosaur eggs, thereby reducing the dinosaur population until it became unsustainable. Another theory was that dinosaurs’ bodies became too big to be operated by their small brains. Some scientists believed a great plague decimated the dinosaur population and then spread to the animals that feasted on their carcasses. Starvation was another possibility: Large dinosaurs required vast amounts of food and could have stripped bare all the vegetation in their habitat. But many of these theories are easily dismissed. If dinosaurs’ brains were too small to be adaptive, they would not have flourished for 160 million years. Also, plants do not have brains nor do they suffer from the same diseases as animals, so their simultaneous extinction makes these theories less plausible.

8 0
3 years ago
Read 2 more answers
Other questions:
  • f. What were the policies of the Renaissance popes, and what impact did those policies have on the Catholic Church?
    15·1 answer
  • Lancelot lives in a society with essentially three different groups of people. The groups consist of the clergy, the nobility (
    14·1 answer
  • Wilbur does not like change. He thinks the cell phone he currently owns is just fine even though it doesn't have all the feature
    11·1 answer
  • Suzanne has been diagnosed with conduct disorder. Her therapist has been teaching her to talk to herself when she is faced with
    11·1 answer
  • why did the federalists believe that the national government could be strengthen by the constitution by stay limited enough to p
    15·1 answer
  • Which Virginian served as Washington’s secretary of state and advised him about other countries?
    8·1 answer
  • Which statement best describes the pattern of income growth in the United States since the 1970s?
    12·1 answer
  • When a country's constitution requires the branches of government to remain independent of each other, it is
    13·1 answer
  • What step should a person involved in domestic violence always take? Leave their abuser immediately. Ignore the consequences of
    6·1 answer
  • Most musical instruments of East Asia originated in _________________.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!