A researcher wants to determine the average amount of minutes it takes for a medicine to reduce headache pain for adult males. The researcher contacted 114 subjects to participate in the study, but only got results from 84 of the subjects. The average time it took for the medicine to reduce headache pain for these subjects was 19 minutes.
What is the population?
What is the sample?
What is the parameter?
What is the symbol for this parameter?
What is the statistics?
What is the symbol for this statistics?
A researcher wants to determine the sensitivity of mammograms to determine how effective they are at diagnosing women who have breast cancer. Assume the researcher obtained the above results from a study, calculate and interpret the sensitivity of mammograms for detecting breast cancer.
| Frequency of Breast Cancer Cases | Frequency of Non-Cancer Cases | |
| Frequency of Individuals Who Screened Positive | 17 | 5 |
| Frequency of Individuals Who Screened Negative | 8 | 77 |
|
A total of 66.67% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
||
|
A total of 68% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
||
|
A total of 70.59% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
||
|
A total of 92.77% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
differing expert answers on bartleby and elsewhere online…leaning towards A based on everything I’ve read…can you please answer and explain why? thanks
A researcher wants to determine whether adolescents spend more time in a day around friends than adults do. He gathers a sample of n =10 adolescents (aged 12-17) and a sample of n =6 adults (aged 25-32). The researcher finds that the average time spent around friends for adolescents is M1= 3 hours with a SS1 of 44. He also finds that the average time spent around friends for adults is M2= 2 hours with a SS2 of 40.
a. Do you use a one- or two-tailed test? What is the critical/cut-off t value with an alpha level of α = .01?
b. What is the variance?
c. What is the estimated standard error?
d. What is the value of the t statistic?
e. Do we reject or fail to reject the null hypothesis (α = .01)? Why?
f. Calculate and report the variance explained ( r2)
A researcher wants to determine the sensitivity of mammograms to determine how effective they are at diagnosing women who have breast cancer. Assume the researcher obtained the above results from a study, calculate and interpret the sensitivity of mammograms for detecting breast cancer.
| Frequency of Breast Cancer Cases | Frequency of Non-Cancer Cases | |
| Frequency of Individuals Who Screened Positive | 17 | 5 |
| Frequency of Individuals Who Screened Negative | 8 | 77 |
|
A total of 66.67% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
||
|
A total of 68% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
||
|
A total of 70.59% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
||
|
A total of 92.77% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. |
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