Definitions
The middle number
What is the median?
Favorite color, hair color, type of shoes are examples of _____ variables
What is categorical?
The mean is 80 and the standard deviation is 10. What is the z-score for an observation of 90?
What is 1?
What % of values are within 2 standard deviations from the mean?
What is 95%?
Where you go in the calculator to find the proportion under a Normal curve.
2:normalcdf(
The sum of the data under the curve is equal to 1.
What is a Density Curve?
Maximum - Minimum
What is Range?
The distribution of scores on an SAT exam is Normal, with a mean 500 and a standard deviation 100. So the median score on the exam is...
What is 500?
For a Normal distribution with mean 20 and standard deviation 5, approx. what percent of the observations will be less than 20?
What is 50%?
Calculator function that includes: area to left, mean, standard deviation
What is 3:invNorm?
A curve where the mean = 0 and the standard deviation = 1.
What is the standard normal curve?
75% of values are lower than this in a data set
What is Q3 (upper quartile)?
To the nearest tenth, the percentage of scores in a standard Normal distribution that are between -2.1 and 0 is...
What is 48.2%?
For a Normal distribution with mean 20 and standard deviation 5, approx. what percent of the observations will be less than 10?
What is 2.5%?
A measure of how much the values in a data set vary.
What is standard deviation?
The percent of the distribution that is at or to the left of the observation.
What is percentile?
What does it mean if you scored within the 25th percentile on a test?
You scored the same or better than 25% of people who took the test.
The heights of adult women are approximately normally distributed about a mean of 65 inches with a standard deviation of 2 inches. If Ronda is at the 99th percentile in height for adult women, than her height, in inches, is closest to ___.
What is 70 inches?
The distribution of heights of adult men is approximately Normal with mean 69 inches and standard deviation 2.5 inches. What percent of all men are between 66.5 and 71.5 inches tall?
What is 68%?
What is the equation for z-score?
What is Z = x - µ /ơ?
Turning your variable (that has a Normal distribution) into one that has a standard Normal distribution.
What is "to standardize?"
Here is a list of exam scores for Mr. William's calculus class:
60 61 61 65 72 75 75 78 81 81 85 89 91 98
What is the percentile of the person whose score was 75?
What is the 50th percentile?
The distribution of the weights of loaves of bread from a certain bakery follows approximately a normal distribution. Based on a very large sample, it was found that 10% of the loaves weighed less than 15.34 ounces, and 20% of the loaves weighed more than 16.31 ounces. What are the mean and standard deviation of the distribution of the weights of the loaves of bread?
What is Mean= 15.93 and Standard Deviation= 0.46?
What percent of observations fall within 3 standard deviations of the mean?
What is 99.7%?
True or False:
A density curve can be used to help define the shape of a bar graph.