Statistics for Nursing ch. 3 Questions
A sample of eight orthopedic patients on your unit includes two patients on intravenous anticoagulants, four patients on oral anticoagulants, and two patients on subcutaneous anticoagulants. Based on the sample, calculate the probability that orthopedic patients are given some form of anticoagulants.
100%
Your results are 2, 14, 6, 8, 10, 4, 12, 8. If a study reports that you have a normally distributed sample with a mean age of 17.3 years, what is the median?
17.3
You read a study involving a new screen for rheumatoid arthritis, and the report indicates that those with the disease had the antibody levels shown in table 3-3. How many subjects had their antibody levels reported?
18
You read a study involving a new screen for rheumatoid arthritis, and the report indicates that those with the disease had the antibody levels shown in table 3-3. Is this sample normally distributed?
No because the mean, median, and modes are different.
A study polls 40 new mothers who attempt to nurse their infants from birth to 6 weeks. Twenty-seven mothers report nursing with minimal pain and frustration, 10 mothers report nursing with moderate pain and frustration, and 3 mothers report discontinuing nursing due to high levels of pain and frustration. What level of measurement is the nursing pain and frustration?
Ordinal
Final exam grades are normally distributed with a mean of 81. The standard deviation is 3. What range includes 95% of the sample?
75-87
Final exam grades are normally distributed with a mean of 81. The standard deviation is 3. What range includes 68% of the sample?
78-84
Your results are 2, 14, 6, 8, 10, 4, 12, 8. What is the mean?
8
Your results are 2, 14, 6, 8, 10, 4, 12, 8. What is the median?
8
Your results are 2, 14, 6, 8, 10, 4, 12, 8. What is the mode?
8
Final exam grades are normally distributed with a mean of 81. The standard deviation is 3. What is the median grade?
81
A study polls 40 new mothers who attempt to nurse their infants from birth to 6 weeks. Twenty-seven mothers report nursing with minimal pain and frustration, 10 mothers report nursing with moderate pain and frustration, and 3 mothers report discontinuing nursing due to high levels of pain and frustration. What percentage of mothers reported less than or equal to moderate pain and frustration?
92.5%
A researcher is measuring how many times a minute a person coughs when exposed to cigarette smoke. The results from the study are normally distributed, and they include a mean of 4 and a standard deviation of 2. What is an appropriate measure of central tendency?
Any Measure
A study polls 40 new mothers who attempt to nurse their infants from birth to 6 weeks. Twenty-seven mothers report nursing with minimal pain and frustration, 10 mothers report nursing with moderate pain and frustration, and 3 mothers report discontinuing nursing due to high levels of pain and frustration. How could you increase the level of measurement?
Change to ratio, "Incorporate mothers who experience no pain."
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. If the researcher graphs the frequency distributions for the scores in each of the 2 groups, which group would have a flatter bell curve and why?
High compliance because of low standard deviation.
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. What level of measurement are the instrument items?
Interval
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. Researchers conduct a study to determine if there is a relationship between receiving the flu vaccine and developing the flu within 48 hours. They report a p-value of 0.78. What general impression do you get from this result?
Likelihood of getting the flu.
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. Researchers run an analysis to determine if taking levothyroxine is associated with tachycardia. The report a p-value of 0.04. What general impression do you get from this result?
Low probability that these results would occur.
A researcher is measuring how many times a minute a person coughs when exposed to cigarette smoke. The results from the study are normally distributed, and they include a mean of 4 and a standard deviation of 2. If instead the results show a mean of 4 and a standard deviation of 1, but they remain normally distributed, what would this change do to the curve?
Make it taller and skinnier.
A study polls 40 new mothers who attempt to nurse their infants from birth to 6 weeks. Twenty-seven mothers report nursing with minimal pain and frustration, 10 mothers report nursing with moderate pain and frustration, and 3 mothers report discontinuing nursing due to high levels of pain and frustration. What is the mode for nursing pain and frustration?
Minimal
A study polls 40 new mothers who attempt to nurse their infants from birth to 6 weeks. Twenty-seven mothers report nursing with minimal pain and frustration, 10 mothers report nursing with moderate pain and frustration, and 3 mothers report discontinuing nursing due to high levels of pain and frustration. What is the median for nursing pain and frustration?
Moderate
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. A patient in the low-compliance group scores 26. Is this patient more or less anxious than average in this group?
More
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. A patient in the high-compliance group has a score with a corresponding Z-score of 2. What was her actual HAM-A score? Is she more or less anxious than the average patient in this group?
19, More Anxious
A sample of eight orthopedic patients on your unit includes two patients on intravenous anticoagulants, four patients on oral anticoagulants, and two patients on subcutaneous anticoagulants. Hip replacement patients have the same probability of being on oral anticoagulants as the orthopedic patients in your previous study, and you have four in your daily assignment. Calculate the number of patients with hip replacements who you anticipate would need oral anticoagulants.
2
A researcher is measuring how many times a minute a person coughs when exposed to cigarette smoke. The results from the study are normally distributed, and they include a mean of 4 and a standard deviation of 2. Where do 68% of the sample responses fall?
2-6
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. Another patient in the low-compliance group has a score with a corresponding Z-score of -1.5. What was his actual HAM-A score? Was he more or less anxious than the average patient in this group?
21, Less Anxious
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. The researcher knows that, with these results, 68% of her subjects in the low-compliance group scored in what range on the HAM-A?
22-26
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. What is the median score in the low-compliance group?
24
A sample of eight orthopedic patients on your unit includes two patients on intravenous anticoagulants, four patients on oral anticoagulants, and two patients on subcutaneous anticoagulants. Based on the sample, calculate the probability that orthopedic patients are given IV anticoagulants.
25%
A sample of eight orthopedic patients on your unit includes two patients on intravenous anticoagulants, four patients on oral anticoagulants, and two patients on subcutaneous anticoagulants. Calculate the probability that orthopedic patients are given subcutaneous anticoagulants.
25%
You read a study involving a new screen for rheumatoid arthritis, and the report indicates that those with the disease had the antibody levels shown in table 3-3. Complete the cumulative frequency column.
3, 8, 11, 18
You read a study involving a new screen for rheumatoid arthritis, and the report indicates that those with the disease had the antibody levels shown in table 3-3. What antibody was the mean?
37.5
Your results are 2, 14, 6, 8, 10, 4, 12, 8. Calculate the standard deviation.
4
Your results are 2, 14, 6, 8, 10, 4, 12, 8. If the sample is normally distributed, 68% of the responses are within what range?
4-12
You read a study involving a new screen for rheumatoid arthritis, and the report indicates that those with the disease had the antibody levels shown in table 3-3. What antibody level was the median?
43
You read a study involving a new screen for rheumatoid arthritis, and the report indicates that those with the disease had the antibody levels shown in table 3-3. What antibody level was the mode?
48
A sample of eight orthopedic patients on your unit includes two patients on intravenous anticoagulants, four patients on oral anticoagulants, and two patients on subcutaneous anticoagulants. Calculate the probability that orthopedic patients are given oral anticoagulants.
50%
A study polls 40 new mothers who attempt to nurse their infants from birth to 6 weeks. Twenty-seven mothers report nursing with minimal pain and frustration, 10 mothers report nursing with moderate pain and frustration, and 3 mothers report discontinuing nursing due to high levels of pain and frustration. What percentage of mothers continued to nurse for the full 6 weeks with minimal pain and frustration?
67.5%
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. If instead of finding a normal distribution in the low-compliance group the researcher discovers there are three individuals with scores that are substantially higher than the rest of the group, what type of skew would these outliers cause?
Positive Skew
A researcher is measuring how many times a minute a person coughs when exposed to cigarette smoke. The results from the study are normally distributed, and they include a mean of 4 and a standard deviation of 2. What level of measurement is this?
Ratio, because the answer can be 0.
A researcher is measuring how many times a minute a person coughs when exposed to cigarette smoke. The results from the study are normally distributed, and they include a mean of 4 and a standard deviation of 2. The follow-up cohort study reports a mean of 5 and a standard deviation of 1. What would this change do to the curve?
Shift Left (Negative Skew)`
A researcher is comparing patients with high medication compliance versus those with low medication compliance in an outpatient psychiatric day program utilizing the Hamilton Anxiety Rating Scale (HAM-A), which has 14 items scored on a scale of 1-4. A higher score on the HAM-A indicates higher levels of anxiety. After collecting the data, she determines the scores obtained in both groups are normally distributed. In the low-compliance group, the mean score is 24 and the standard deviation is 2. In the high-compliance group, the mean score is 16 and the standard deviation is 1.5. If the distribution is skewed, what do you know about the mean, median, and mode?
They all will shift.
