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

Question

21-04-2020
Mathematics

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

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kollybaba55 kollybaba55 · Answer 1 · 2020-04-21T10:24:38+02:00

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

bratislava bratislava · Answer 2 · 2021-11-19T10:16:18+01:00

As park is interested to study how the functions of the brain change with age and how older individual memory ability changes. For this, she selects 11 and 16 yrs old adults to study the landscape.

As per Dr park, her team notices some older adults produce the same level of activity during the tasks and the younger adults showed more diversity of brain. While others showed less brain activity. For this, she wants to use the independent measure of the T-test to study how they react to visual tasks.

As per the population, it would not be valid for Dr park to make use of the T-test. As the two populations where the samples are selected do not appear to have equal variances.

Hence the option C is correct.

Learn more about the Park is interested in how the functioning of the brain changes with age.

brainly.com/question/16096197.