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July 21, 2017UncategorizedBy classhelp24@gmail.com [email if you need fresh paper done]

Three questions plus one attached question. ?Need to see the breakdown to get answer to each….

1. A clinical trial is conducted comparing a new pain medication for arthritis.? Participants are randomly assigned to receive the new medication or a placebo.? The outcome is pain relief within 30 minutes.? The data are shown below.

Pain Relief

No Pain Relief

New Medication

44

76

Placebo

21

99

Estimate the risk difference in pain relief between treatments

=

Estimate the relative risk in pain relief between treatments

=

Estimate the odds ratio in pain relief between treatments

=

The upper and lower limits of the are shown below

Lower Limit of CI: ____0.41____

Upper Limit of CI: ___1.61_____

Based on the Confidence Interval values which of the following are true?

One can be 95% confident that the true value will be greater than the upper limit.One can be 95% confident that the true value will be greater than the lower limit.One can be 95% confident that the true value will between the upper and lower limit.

  • a and b

2. The following data were collected in a clinical trial evaluating a new compound designed to improve wound healing in trauma patients.? The new compound is compared against a placebo.? After treatment for 5 days with the new compound or placebo the extent of wound healing is measured and the data are shown below.

Percent Wound Healing

Treatment

0-25%

26-50%

51-75%

76-100%

New Compound ()

15

37

32

41

Placebo ()

36

45

34

10

Is there a difference in the extent of wound healing by treatment?? (Hint:? Are treatment and the percent wound healing independent?)? Run the appropriate test at a 5% level of significance.

??????????????????? df= ________

?????????????? alpha= ________

?Reject H0 if ?2>________

Compute expected frequencies

Expected Frequency = (Row Total * Column Total)/N.

Complete the expected frequencies for each cell.

Percent Wound Healing

Total

Treatment

0-25%

26-50%

51-75%

76-100%

New Compound

15

( ??)

37

( ??)

32

( ??)

41

( ??)

125

Placebo

36

(? ?)

45

( ??)

34

( ??)

10

( ??)

125

Total

51

82

66

51

250

Compute? ?2.

???????????? ?2= ________

Based on comparing the computed ?2 to the rejection level ?2 which of the following is (are) true?

  • We have statistically significant evidence at .05 to show that H0 is false.
  • Treatment and percent wound healing are not independent.
  • Treatment and percent wound healing are independent.
  • a and b.

3. A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo.? Participants are randomly assigned to receive the new treatment or a placebo and the outcome is pain relief within 30 minutes.? The data are shown below.

Pain Relief

No Pain Relief

New Medication

44

76

Placebo

21

99

Is there a significant difference in the proportions of patients reporting pain relief?? Run the test at a 5% level of significance.

Reject H0 if Z <? ________ ?or if Z > ________

alpha= ________

?= ________

?= ________

??= ________

??Z ??= ________

Based on comparing the computed z to the rejection level z which of the following is (are) true?

  • We have statistically significant evidence at .05 to show that H0 is false.
  • We have statistically significant evidence at .05 to show that there a significant difference in the proportions of patients reporting pain relief.
  • We do not have statistically significant evidence at .05 to show there a significant difference in the proportions of patients reporting pain relief.
  • a and b
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