Assume that adults have IQ scores that are normally distributed with a mean of 101.6 and a standard deviation 22. Find the first quartile Upper Q 1, which is the IQ score separating the bottom 25% from the top 75%. How do I find the q1 by using Ti 84 calculator?
Answers
Answer:
escribing data, always start with a graphical representation.
Graphs help identify the overall distribution pattern. Looking at a graph
makes it visually clear how spread a variable is, which values occur most
frequently, and whether or not the distribution is skewed.
Next, obtain more precise information by providing a numerical summary of
the data using the mean, median, range, five-number summary, and any
other appropriate information.
Some distributions are so regular that they can be described by a smooth
curve. Real data are represented in a histogram. Curves represent a symbol,
or an abstract version of a distribution.
Density curves are lines that show the location of the individuals along the
horizontal axis and within the range of possible values.
They help researchers to investigate the distribution of a variable.
Some density curves have certain properties that help researchers draw
conclusions about the entire population.
1. Always plot data first: make a graph.
2. Look for the overall pattern (shape, center, and spread) and
for striking departures such as outliers.
3. Calculate a numerical summary to briefly describe center and
spread.
4. Sometimes the overall pattern of a large number of
observations i