Do you think that their cholesterol levels were significantly lowered? Quiz
The question sheet
Reveal any answer as you study-
In the biofeedback study, the differences in blood pressure were calculated as:
- after – before
- after only
- before – after
- average of both
Reveal answer
Answer: after – before
Source evidence
PDF page 583: Use the following information to answer the next two exercises. An experiment is conducted to show that blood pressure can be consciously reduced in people trained in a biofeedback exercise program. Six subjects were randomly selected, and blood pressure measurements were recorded before and after the training. The difference between blood pressures was calculated (after – before), producing the following results:
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How many subjects were randomly selected in the biofeedback blood pressure study?
- Eight
- Four
- Five
- Six
Reveal answer
Answer: Six
Source evidence
PDF page 583: Use the following information to answer the next two exercises. An experiment is conducted to show that blood pressure can be consciously reduced in people trained in a biofeedback exercise program. Six subjects were randomly selected, and blood pressure measurements were recorded before and after the training. The difference between blood pressures was calculated (after – before), producing the following results:
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In the biofeedback study, the mean difference was reported as:
- −8.4
- 10.2
- −10.2
- 8.4
Reveal answer
Answer: −10.2
Source evidence
PDF page 583: = −10.2 sd = 8.4. Using the data, test the hypothesis
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In the biofeedback study, the standard deviation of differences (sd) was:
- 10.2
- 6.4
- −10.2
- 8.4
Reveal answer
Answer: 8.4
Source evidence
PDF page 583: = −10.2 sd = 8.4. Using the data, test the hypothesis
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What hypothesis is being tested in the biofeedback blood pressure study?
- Blood pressure unchanged
- Blood pressure doubled
- Blood pressure decreased
- Blood pressure increased
Reveal answer
Answer: Blood pressure decreased
Source evidence
PDF page 583: that the blood pressure has decreased after the training.
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In the preventative medication study, how many patients were in the treatment group?
- 45
- 113
- 68
- 224
Reveal answer
Answer: 224
Source evidence
PDF page 582: Use the following information to answer the next two exercises. A new preventative medication was tried on a group of 224 patients who had the same risk factors for a disease. 45 patients developed the disease after four years. In a control group of 224 patients, 68 developed the disease after four years. We want to test whether the method of treatment reduces the proportion of patients who develop the disease after four years.
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How many treated patients developed the disease after four years?
- 68
- 113
- 224
- 45
Reveal answer
Answer: 45
Source evidence
PDF page 582: Use the following information to answer the next two exercises. A new preventative medication was tried on a group of 224 patients who had the same risk factors for a disease. 45 patients developed the disease after four years. In a control group of 224 patients, 68 developed the disease after four years. We want to test whether the method of treatment reduces the proportion of patients who develop the disease after four years.
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In the control group of 224, how many developed the disease after four years?
- 136
- 224
- 45
- 68
Reveal answer
Answer: 68
Source evidence
PDF page 582: Use the following information to answer the next two exercises. A new preventative medication was tried on a group of 224 patients who had the same risk factors for a disease. 45 patients developed the disease after four years. In a control group of 224 patients, 68 developed the disease after four years. We want to test whether the method of treatment reduces the proportion of patients who develop the disease after four years.
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In the medication study, subscript 't' represents the:
- Time period
- Total patients
- Treated patient
- Tested control
Reveal answer
Answer: Treated patient
Source evidence
PDF page 582: Let the subscript t = treated patient and ut = untreated patient.
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Which set of hypotheses uses H0: pt = put and Ha: pt < put?
- Option c
- Option b
- Option a
- Option d
Reveal answer
Answer: Option d
Source evidence
PDF page 582: d. H0: pt = put and Ha: pt < put
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Which conclusion states the method has no effect?
- Option a
- Option d
- Option b
- Option c
Reveal answer
Answer: Option a
Source evidence
PDF page 582: a. The method has no effect.
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In the golf instructor study, how many new students did she take?
- Three
- Two
- Four
- Six
Reveal answer
Answer: Four
Source evidence
PDF page 583: 119. A golf instructor is interested in determining if her new technique for improving players’ golf scores is effective.
PDF page 583: She takes four new students. She records their 18-hole scores before learning the technique and then after having taken her class. She conducts a hypothesis test. The data are as follows.
Statistics
Statistics by OpenStax, used under CC BY 4.0. Changes made by Stratacademy.
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