module 4 practice test 3

Refer to the stem plot below to answer the following question. Stem plot reflecting the ages of the surveyed employed nursing population. Determine the number of nurses in the survey. a 19 b 25 c 20 d Cannot determine

20 The correct answer is c. Count all the leaves.

Assume a normal distribution of data. What percent of the population will fall between 1 and 2 standard deviations above the mean? a 2.35% b 13.5% c 14.7% d 16.75%

13.5 The correct answer is b. The Standard Deviation Rule says that 34% of the values will fall within 1 standard deviation above mean and that 47.5% of the values will fall within 2 standard deviations above the mean. To find the population that will fall between 1 and 2 standard deviations we subtract 34% from 47.5% to get 13.5%.

Determine Q1 for the level of hemoglobin in the following sample. {20.2, 19, 14.9, 17.2, 18.2, 19.3,12.6,12.6,16.1} a 13.75 b 19.15 c 5.4 d 25%

13.75 The correct answer is a. Q1 is the value that represents the limit for the lowest 25% of the data.

Determine the median for the level of hemoglobin in the following sample. {20.2, 19, 14.9, 17.2, 18.2, 19.3,12.6,12.6,16.1} a 16.7 b 17.2 c 12.6 d 5.4

17.2 The correct answer is b. The median is the middle value if the list is sorted. Therefore, the median is: {12.6,12.6, 14.9, 16.1, 17.2, 18.2, 19, 19.3, 20.2}

Refer to the bar chart below to answer the following question. Bar chart reflecting median earnings for full-time, year-round workers based on licensing and gender. Determine the best estimate for the difference in salary for female NPs and RNs. a 20,000 b 90,000 c 130,000 d 50,000

20,000 The correct answer is a. $80,000 - $60,000 = $20,000

Use the pie chart below to answer the following question. Pie chart reflecting the RN population at various institutions. Nursing homes and extended care facilities, 6.5%, Ambulatory care 11.7%, Public/Community Health 18.3%, Hospitals 50.1%, Other 13.4%. If 366 nurses work in public/community health, how many are in the survey? a 2000 b 1500 c 670 d 6700

2000 366 ÷ 0.183 = 2,000.

According to the Standard Deviation Rule in a population that is normally distributed, what percent of the population will fall between 2 and 3 standard deviations of the mean? (Include both above and below the mean!) a 4.7% b 2.35% c 7.5% d 10.2%

4.7 The correct answer is a. The Standard Deviation Rule says that 2.35% of the values will fall within 2 to 3 standard deviations above the mean. Since we are looking for the population that both falls above and below the mean, we would multiply 2.35 by 2. Therefore, the answer is 4.7%.

Refer to the histogram below to answer the following question. Histogram reflecting the frequency of a sample population in terms of the number of years worked as a nurse. . How many nurses have between 10 and 20 years of experience? a 31 b 48 c 55 d 51

51 The correct answer is d. Approximately 31 worked 10-15 years and 20 worked 16-20 years. 31 + 20 = 51.

Use the pie chart below to answer the following question. Pie chart reflecting the RN population at various institutions. Nursing homes and extended care facilities, 6.5%, Ambulatory care 11.7%, Public/Community Health 18.3%, Hospitals 50.1%, Other 13.4%. If 500 nurses are surveyed, how many work in the category labeled "other?" a 29 b 67 c 57 d 74

67 b. 500 x 0.134 = 67.

Use the stem plot below to answer the following question. Stem plot reflecting the ages of the surveyed employed nursing population. Determine the number of nurses in the survey who were in their 30's. a 5 b 7 c 6 d Cannot determine

7 Count the number of leaves in the "3" stem.

Determine the range for the level of hemoglobin in the following sample. {20.2, 19, 14.9, 17.2, 18.2, 19.3,12.6,12.6,16.1} a 12.6 b 7.6 c 20.2 d 5.4

7.6 The correct answer is b. The range is equal to the maximum minus the minimum value. 20.2 - 12.6 = 7.6.

Determine the median (Q2) for the following list of triglyceride levels. {121,110, 74,47,90,71,97,146} a 93.5 b 121 c 47 d 71.5

93.5 The correct answer is a. Ordering the data set, Q2 falls between 90 and 97. Q2 = fraction begin. numerator: (90 + 97) denominator: 2 fraction end. = 93.5.

What summary values need to be known in order to determine if a value is an outlier? a Q1 b Q3 c Mean d Both A and B

BOTH A AND B You can determine IQR knowing Q1 and Q3.

What is the best type of graph to use where it is easiest to estimate outliers? a) Stem plot b) Histogram c) Dot plot d) Box plot

Box plot The correct answer is d. Outliers are determined by Q1 and Q3, which are clearly shown on a box plot. The outliers themselves are also displayed on the box plot.

Please use the graph below to answer the following question: Graph reflecting average RN salaries in 2009, 2010, and 2012. Of the following options, which is the most misleading fact pertaining to this graph? a The graph is depicted in 3D. b The vertical scale does not start at 0. c The acronym RN isn't defined. d The bars are colored.

The correct answer is b. The vertical scale does not start at 0.

When observing a box plot, what proportion of the data lies between Q1 and Q3? a 25% b 50% c 75% d 100%

The correct answer is b. This area represents the middle 50% of the data.

Which of the following will result in a data set with more than one value? a Number of hospitals in Massachusetts b Average age for all of the patients currently in the ICU c Age of each of 15 randomly selected patients d Your current weight

The correct answer is c. The other three answers are single measured values.

How are the mean and median of a sample related if the distribution is negatively skewed? The mean is greater than the median. b The mean is less than the median. c They are equal. d Cannot be determined

The mean is less than the median. When the distribution is negatively skewed, the mean is less than median.

You surveyed 50 nurses in the Boston area to determine at which hospital they are employed. What type of graph would be best to use to display this data? a Bar graph b Pie chart c Histogram d Dot plot

bar graph The correct answer is a. Bar graph. While pie charts are used for categorical data, a bar graph is a better choice since the entire nursing population (as a whole) has not been surveyed. The best way to display a large quantitative data set is a histogram.

Assuming all four lists have the same mean value of 100, which list appears to have the greatest standard deviation? a 98, 98, 100, 97, 92, 104 b 100, 100, 100, 100, 100, 100 c 99, 107, 83, 92, 86, 90 d 142, 95, 164, 125, 169, 128

d The list contains the greatest range of values.