QUESTIONS 1. A researcher recruited 55 adults and tested their ability to rememb
ID: 3061995 • Letter: Q
Question
QUESTIONS
1. A researcher recruited 55 adults and tested their ability to remember a list of words. For each participant, the researcher counted the number of words correctly recalled and recorded their age (in years).
HYPOTHESIS
The research hypothesis is that age is related to memory performance.
This hypothesis is SELECT ONE
A. directional
B. non-directional
RESULTS
Suppose the researcher calculated a correlation of r = 0.395 between age and memory performance.
APA style: (r(53) = 0.395, p < 0.01)
CONCLUSION
This result_A. is or B. is not (SELECT ONE)_____ statistically significant
We_A. fail to reject or B. reject (SELECT ONE)_____ the null hypothesis that there is no relationship between (predictor)_A. age or B. memory performance (SELECT ONE)___and (outcome)_A. age or B. memory performance (SELECT ONE)_____(r(53) = 0.395, p < 0.01). As age increases,_A. so does memory performance or B. memory performance decreases (SELECT ONE)_____.
2. A researcher recruited 55 adults and tested their ability to remember a list of words. For each participant, the researcher counted the number of words correctly recalled and recorded their age (in years).
HYPOTHESIS
The research hypothesis is that age is negatively related to memory performance.
This hypothesis is SELECT ONE
A. directional
B. non-directional
RESULTS
Suppose the researcher calculated a correlation of r = -0.04 between age and memory performance.
APA style: (r(53) = -0.04, p > 0.05)
CONCLUSION
This result_A. is or B. is not (SELECT ONE)_____ statistically significant
We_A. fail to reject or B. reject (SELECT ONE)_____ the null hypothesis that there is no relationship between (predictor)_A. age or B. memory performance (SELECT ONE)___and (outcome)_A. age or B. memory performance (SELECT ONE)_____(r(53) = -0.04, p > 0.05). There is_A. no or B. statistically significant (SELECT ONE)_____evidence that these two variables are related to each other.
3. A researcher recruited 40 adults between the ages of 40 and 80 and tested their ability to remember a list of words. For each participant, the researcher counted the number of words correctly recalled and recorded their age (in years).
HYPOTHESIS
The research hypothesis is that age is related to memory performance.
This hypothesis is SELECT ONE
A. directional
B. non-directional
RESULTS
Suppose the researcher calculated a correlation of r = -0.24 between age and memory performance.
APA style: (r(48) = -0.24, p < 0.05)
CONCLUSION
This result_A. is or B. is not (SELECT ONE)_____ statistically significant
We_A. fail to reject or B. reject (SELECT ONE)_____ the null hypothesis that there is no relationship between (predictor)_A. age or B. memory performance (SELECT ONE)___and (outcome)_A. age or B. memory performance (SELECT ONE)_____(r(48) = -0.24, p < 0.05). As age increases,_A. so does memory performance or B. memory performance decreases (SELECT ONE)_____.
4. A researcher tested 23 older adults and 23 younger adults on their ability to remember a list of words. For each participant in each group, the researcher counted the number of words correctly recalled.
HYPOTHESIS
The research hypothesis is that age predicts memory performance.
This hypothesis is SELECT ONE
A. directional
B. non-directional
RESULTS
Suppose the researcher found that the younger adults remembered a mean of 32 words (SD = 1.2) and the older adults remembered a mean of 30 words (SD = 2.7).
Suppose the calculated t is 1.655
APA style: (t(44) = 1.655, p > .05)
CONCLUSION
This result_A. is or B. is not (SELECT ONE)_____ statistically significant
We_A. fail to reject or B. reject (SELECT ONE)_____ the null hypothesis that there is no difference in A. age or B. memory performance (SELECT ONE)___between the two__A. age or B. memory performance (SELECT ONE)__groups (t(44) = 1.655, p > .05). There is___A. evidence or B. no evidence (SELECT ONE)_____that the older adults remembered fewer words (M= 30, SD = 2.7) than the younger adults (M = 32, SD =1.2).
5. A researcher tested 23 older adults and 23 younger adults on their ability to remember a list of words. For each participant in each group, the researcher counted the number of words correctly recalled.
HYPOTHESIS
The research hypothesis is that the younger adults will perform differently on this task than the older adults.
This hypothesis is SELECT ONE
A. directional
B. non-directional
RESULTS
Suppose the researcher found that the younger adults remembered a mean of 36 words (SD = 1.2) and the older adults remembered a mean of 30 words (SD = 2.7).
Suppose the calculated t is 2.613
APA style: (t(44) = 2.613, p < 0.01)
CONCLUSION
This result_A. is or B. is not (SELECT ONE)_____ statistically significant
We_A. fail to reject or B. reject (SELECT ONE)_____ the null hypothesis that there is no difference in A. age or B. memory performance (SELECT ONE)___between the two__A. age or B. memory performance (SELECT ONE)__groups (t(44) = 2.613, p < 0.01). The older adults remembered____A. fewer or B. the same number of or C.more (SELECT ONE)_____ words (M = 30, SD = 2.7) than the younger adults (M = 36, SD = 1.2).
Explanation / Answer
1.
This hypothesis is:
b. non- directional
It is not a one tailed test.
for, r=0.395 and df = 53,
p value = 0.003421
This result is statistically significant.
Here we reject the null hypothesis that there is relationship between age and memory performance. We conclude that there is evidence that these two variables are related to each other.
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