Biostatistics
Diaz, Exam I
Terms
undefined, object
copy deck
- According to the emperical rule, what % of values fall within the 3 standard deviation of the mean?
- 99.7%
- What is biostatistics?
- The science of collecting, organizing, analyzing, and interpreting data collected within the public health and medical fields
- What are the 4 shapes of interest in the distribution of continuous data?
- Uniform shape, symmetric shape, left-skewed, right-skewed
- According to the chebyshev's theorem what % of values lie within 2 standard deviations of the mean
- 75%
- What are two ways to describe quantitative data?
- Discrete and continuous
- "N" denotest what?
- population size
- What is a statistic?
- A measurement descibing some characteristic of a smaple
- Define quatitative data
- data that consists of numbers representing counts or measurements
- What are the 2 types of data in biostatistics?
- Qualitative and quantitative
- What are three graphical techniques used for qualitative data?
- bar graph, pie graph, pareto chart
- What is the purpose of standard deviation?
- It measures the variation among data values
- "n" denotes what?
- sample size
- When there is one response collected on each subject, this is called....
- Univariate
- What is data?
- Information used to reason or make decision about a population or sample
- According to the emperical rule, what % of values fall within the 2 standard deviation of the mean?
- 95%
- According to the emperical rule, what % of values falls within the 1 standard deviation of the mean?
- 68%
- What are two graphing representations for continuous data
- histogram and stem-and-leaf display
- What is a parameter?
- A measurement describing some characteristic of a population
- What is the measure of variability that compares each data value to the sample mean?
- sample variance
- What are two other name for the median?
- 50th percentile and 2nd quartile (Q2)
- According to the chebyshev's theorem what % of values lie within 3 standard deviations of the mean?
- 89%
- How can a rough estimate of the range for a set of data be found given the standard deviation for the set?
- For the minimum value subtract 2 times the standard deviation from the mean and for the maximum value add 2 times the standard deviation to the mean
- The Chebyshev's theorem applies to what type of data sets?
- Applies to any data set; its results are very approximate
- What is the measure of variability that is the square of the population standard deviation?
- Population variance
- What is the measure of variability that compares each data value to the population mean?
- population variance
- If "n" is an even number, what would the median be?
- the average of the two middle numbers arranged in increasing order
- What does continuouse data refer to?
- data results that have infineitely many possible values that correspond to some continuos scale
- Define range
- it is the difference between the maximum value and the smallest value of a data set
- Greek letters typically represent statistics and english letters represent parameters in statistics?...T or F
- False; it's vice versa
- What is a sample?
- It is a subset of the population
- greak letter "mu" denotes what?
- the population mean
- The graphical techniques used for qualitative data are also used for...discrete data or continuous data?
- discrete data
- A data set always has a mode?...T or F
- False
- What equation do you use to roughly estimate standard deviation
- range divided by 4
- Define qualitative data
- data that consists of non-numerical categories
- What are two methods used to know the appropriateness of the linear model?
- Scatter plot and the linear correlation coeffient
- What 2 areas of statistical study is data collected from?
- design of experiment and sampling methodology
- The empirical rule applies to what type of data sets?
- bell-shaped distributions
- The population variance is almost how much each data value lies on average away from the population mean...True or False
- False; it is exactly not almost, for sample variance it is almost how much each data value lies on average away from the sample mean
- What is a graphical representation of the 5-number summary?
- Box and Whisker Plot
- What are the 3 measures of central tendency?
- mean, median, and mode
- What is the measure of variability that is the square root of sample variance?
- Standard deviation
- What does discrete data refer to?
- data that has values of finite numbers or countable numbers
- For symmetric distribution the median=mode=mean...T or F
- True
- What there are two responses collected on each subject, this is called...
- Bivariate
- What measure of variation is free of specific units of measure?
- Coefficient of variation
- "xbar" denotes what
- the mean
- What is a population?
- Includes all subjects to be studied