Ch 1: Data & Statistics
Ch 3: Descriptive Statistics, Variability
Ch 3: Z-Score, Empirical, Chebyshev's
Ch 3: Boxplots
Ch 6: Normal Probability Model
100
facts and figures that are transformed into information
What is data?
100
(Symmetry, skewness, modality)
What is a non-symmetrical, skewed right, unimodal histogram?
100
= (x - μ) / σ
What is z-score?
100
The percentage of values that lie between Q1 & Q3
What is 50%?
100
The general Excel function used to calculate probabilities given x (from a normal distribution)
What is "=NORM.S.DIST()"?
200
Descriptive, inferential
What are the two types of statistics?
200
=QUARTILE.EXC(____,3) - QUARTILE.EXC(____,1)
What is the Excel function for calculating IQR?
200
According to this, approximately 68% of values (in a normal distribution) are within one standard deviation of the mean.
What is the Empirical Rule?
200
(Skewness?)
What is a skewed right boxplot?
200
A health expert believes that American adults sleep an average of 6.2 hours on weekdays with a standard deviation of 1.2 hours. Assume that sleep time on weekdays follows a normal distribution. What is the probability that a randomly selected American adult sleeps more than 8 hours on weekdays?
What is 6.7%?
300
Type of categorical/qualitative data; there is a relationship b/t the levels
What is ordinal data?
300
square root of the variance
What is standard deviation?
300
The distribution of a monthly utility bill of a 3 bedroom house using gas or electric energy has mean = $97 and standard deviation = $12. What percentage of homes have a monthly bill b/t $61 and $133?
What is "at least 88.89% of homes have a monthly bill b/t $61 and $133"?
300
(Skewness?)
What is a skewed left boxplot?
300
The flight times from LAX to New York are normally distributed. The average flight time is 325 minutes. The standard deviation is 20 minutes. What is the probability that a random flight takes between 315 to 350 minutes?
What is 58.58%?
400
Type of sampling error; one subset of the population has no chance, less of a chance, or more of a chance of being chosen
What is selection bias?
400
= standard deviation/mean * 100%
What is the coefficient of variation (CV)?
400
The distribution of a monthly utility bill of a 3 bedroom house using gas or electric energy has mean = $97 and standard deviation = $12. The distribution is mound-shaped and symmetric. What percentage of homes have a monthly bill > $121?
What is "2.5% of homes have a monthly bill > 121"?
400
The lower and upper limits of the 1.5-IQR Rule?
What is the "lower limit = Q1 - 1.5*IQR"? What is the "upper limit = Q3 + 1.5*IQR"?
400
The mean daily studying time for ISDS 361A is 5 hours, with a standard deviation of 1.2 hours. Suppose the daily studying time is normally distributed. If I study for more hours than 80% of ISDS 361A students, at least how many hours am I studying per day?
What is 6.01 hours?