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
kap26 [50]
3 years ago
14

Dr. Park is interested in how the functioning of the brain changes with age and how this, in turn, affects older individuals’ me

mory abilities. She randomly selects 11 older and 16 younger adults to study pictures of landscapes presented for 5 seconds each. After a 10-minute rest period, both groups perform a visual recognition test. They view a series of pictures and categorize each as either "old" (part of the set they studied) or "new" pictures. While this test is occurring, researchers use fMRI to measure the participants’ brain activity. Dr. Park and her team notice that the older adults all produced similar amounts of activity during the task. The younger adults, on the other hand, showed much more diversity of brain activity. Some younger study participants had a large amount of activity, while others had much less. Would it be valid for Dr. Park to use the independent-measures t test to test whether the brain activity of younger adults is different from that of older adults during a visual recognition task?
a. Yes, because none of the assumptions of the independent-measures t test are violated.
b. Yes, because the independent-measures t test is a robust test. No, because the two groups studied are not independent.
c. No, because the two populations from which the samples are selected do not appear to have equal variances.
Mathematics
2 answers:
a_sh-v [17]3 years ago
8 0

Answer:

Option C.  No, because the two populations from which the samples are selected do not appear to have equal variances.

Step-by-step explanation:

The variance measures how far a set of (random) numbers are spread out from their average value.

The fact that the younger adults show diversity in their brain activity while the older adults produce similar activities show that there are no equal variances in the two populations from which the samples are selected.

Therefore it would not be valid for Dr. Park to use the independent-measures t-test to test whether the brain activity of younger adults is different from that of older adults during a visual recognition task

AnnZ [28]3 years ago
5 0

Answer:

No, because the two populations from which the samples are selected do not appear to have equal variances.

Step-by-step explanation:

We know that in the given study the two groups studied are older and younger people. The samples are randomly selected and are independent of each other. The t-test is a robust test if the assumptions are followed. In the given study, we are given that the older adults produced a similar response, while the younger adults produced more of diverse brain activity. Therefore, the variance of younger adults would not be equal to the variance of older adults. Since one of the assumptions of the t-test is that the population of the two groups have same variance and here this assumption appears to be violated. Hence the correct option is:  No, because the two populations from which the samples are selected do not appear to have equal variances.

You might be interested in
each morning a gardener uses 24 1/2 gallons of water from a metal reservoir.each afternoon,she adds 15 1/4 gallons of water to t
Alika [10]
Every day, the volume increases by 24 1/2+15 1/4=39 3/4 gallons. So after 5 days, the volume increases by 39 3/4 * 5 = 795/4= 198.75 gallons
3 0
3 years ago
Can someone help with this question? Thank u! :)
MatroZZZ [7]

Answer:

2.50

Step-by-step explanation:

the pattern shown in the miles driven goes up each time by 5000, stating it's going up by a constant of 5000. the cost goes up each time by 2000.

divide 5000/2000 which would give you 2.5

round it by two decimal places which gives you 2.50

7 0
3 years ago
Please answer this correctly
bonufazy [111]

Answer:

The dependent variable is m

Step-by-step explanation:

A dependent variable is dependent on an independent variable. This variable is dependent on other variable that are measured . The dependent variable are expected to change as a result of the manipulation of the independent variables. Usually as the experiments changes the independent variable the dependent variable are observed and noted.

The independent variable is unaffected by the other variable you are measuring. The independent variable represent a quantity that is been manipulated in an experiment.

According to the question Jenny works as a server at Jefferson restaurant . The more table she is assigned to serve the more money she earns during a shift.

The independent variable is the number of table Jenny served because this is what she has control over.

The dependent variable is the amount of money Jenny earns because the amount of money she earns is dependent on the number of tables she served . Therefore the dependent variable is m

7 0
3 years ago
What is significant about circles that provides us with an equilateral triangle?
Ipatiy [6.2K]

Answer:

The circle is important when constructing equilateral triangles because it can allow one to draw an accurate triangle while not having a ruler to measure it out.

Step-by-step explanation:

7 0
3 years ago
6th grade math help me plzz
uysha [10]

Answer:

A-B really simple.

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • I need serious Help!
    5·1 answer
  • The table shows the number of stars awarded in an online math game
    8·1 answer
  • PLEASE HELP ME!!!!!!!!!!! BRAINLEIST ANSWER WILL BE GIVEN :)
    5·1 answer
  • 3. One morning, the elevator in Emilio's apartment building was out of order. When he walked down the stairs from
    12·1 answer
  • Which is another way to write 3 tens 9 ones
    15·1 answer
  • Is this wrong?
    5·1 answer
  • What is the vertex and line of symmetry on this table?
    8·1 answer
  • Every month, $55 is withdrawn from Tom's savings account to pay for his gym membership. He has enough savings to withdraw no mor
    12·1 answer
  • Solving for x<br><br> r + 11 + 8r = 29
    11·2 answers
  • Genevieve is buying snacks at the concession stand.she bought 3 hamburgers and 2 order of fries.the fries cost 2.50$.she spent a
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!