Chapter 16 Flashcards
The mean of sampling distribution refers to what?
Population and normal curve
What is a normal curve?
Symmetrical about the mean
Unimodal
Which statements are applicable to type 2 errors?
They occur when the sample size is too small
Mean accepts the null hypothesis when it is false
When are the parametric tests of significance used?
Measurement is on an interval or ratio scale
At least one population parameter is estimated
What are the levels of measurement, in ascending order?
Nominal, ordinal, interval, ratio
Which level of measurement is ranked variables or events with unequal intervals between numbers on the scale?
Ordinal
Which level of measurement has a scale with an absolute zero?
Ratio
A frequency distribution is used to do what?
Organize data by the frequency of response
When data are skewed and the researcher is interested in the “typical” score, what is the most appropriate measure of central tendency for the nurse researcher to use?
Median
What percentage of scores fall within 1 standard deviation (SD) of the mean?
68%
What is the best way to describe the distribution of the ages of all people who died in 2013?
Negatively skewed
When data are positively skewed, where will the mean be located?
To the right of the median
Which measure of variability is the most unstable?
Range
What is the measure of variability that indicates the range of the middle 50% of the scores?
Semiquartile range
A percentile of 90 is exceeded by what percentage of the scores?
10%
A statistic is a characteristic of what?
Sample
What occurs when differences between score are too large to be caused by chance?
Null hypothesis is rejected
When is the t statistic used?
When the investigator is measuring the differences of means between two groups
Which level of measurement focuses on relative rankings?
Ordinal
Which level of measurement focuses on classification?
Nominal
Which level of measurement focuses on rank ordering with equal intervals and absolute zero?
Ratio
Which level of measurement focuses on rank ordering with equal intervals?
Interval and ratio
Of the measures of central tendency, the most stable is considered to be what?
Mean
The nurse researcher is interested in performing parametric tests of association on more than two variables. The most appropriate tests to use would consist of what?
Path analysis
Multiple regression
