Density Curves and Normal Distributions
All Normal Distributions follow which rule?
What is the 68, 95, 99.7 Rule or Empirical Rule?
What is the key difference between and experiment and an observational study?
In an experiment a treatment is imposed.
A distribution has a mean that is much larger than the median. The shape of the distribution is...
What is skewed to the right.
Used to describe a scatterplot?
What is direction, form and strength?
What is Mountain Dew or Nectar of the gods?
What is the area to the left of Z = 2.01
0.9778
Sampling method in which the groups are similar within but different between
What is the standard deviation.
Makes the sum of the squares of the residuals as small as possible?
What is the LSRL or Least Squares Regression Line?
University where Mr. McAfee earned his Bachelor of Science degree in mathematics
What is Purdue University?
Scores on an IQ test for a certain group are approximately normal with a mean of 110 and a standard deviation of 25. What percent of people in this group have IQ scores between 125 and 150?
0.2195 or 21.95%.
The most important advantage of experiments over observational studies.
What is evidence of causation or cause and effect.
Consider the following data set. Give the cutoff values that would be used to determine if there are outliers. Must show work!
16, 19, 24, 25, 25, 26, 28, 33, 33, 34, 37, 37, 40, 42, 45, 45, 46, 49, 73
What are 75 and -5? must have work to support answers.
Percent of variation in the y variable that can be explained by the least squares regression of y on x.
What is r-squared or the coefficient of determination?
First marathon where Mr. McAfee qualified for the Boston Marathon.
What is the Columbus Marathon?
The weight of a certain type of cockroach follows a normal distribution with a mean of 50 grams. After measuring the weights of many cockroaches, a lab assistant reports that 14% of the cockroaches weigh more than 55 grams. Based on this report, what is the approximate standard deviation of weights for this type of cockroach? Make sure and label your answer!
What is 4.6 grams?
To gather information about the validity of a new standardized test for tenth-grade students in a particular state, a random sample of 15 high schools was selected from the state. The new test was administered to every 10th grade student in the selected high schools. This kind of sample is ...
What is a Cluster Sample?
Consider the following SAMPLE data:
16, 19, 24, 25, 25, 26, 28, 33, 33, 34, 37, 37, 40, 42, 45, 45, 46, 49, 73
Find the mean, standard deviation, and variance.
What is 35.6316, 13.1496, and 172.9123.
The equation of the LSRL that can be used to predict the number of wins from the average number of points scored per game is y-hat = -3.75 +0.437x where x is the average number of points and y-hat is the number of wins.
Find the residual for a South Carolina, which scored an average of 30.1 points per game and had 11 wins.
What is 1.6 wins?
Name of Mr. McAfee's one-eyed pet goldfish?
Who is One-Eyed Jack?
An airline flies the same route at the same time each day. The flight time varies according to a normal distribution with unknown mean and unknown standard deviation. On 15% of the days, the flight takes more than an hour. On 3% of the days, the flight lasts 75 minutes or more. Find the mean and standard deviation.
What is mean = 41.43 minutes and standard deviation = 17.86 minutes
Suppose that 35% of the registered voters in a state are registered Republicans , 40% as Democrats, 25% as Independents. A newspaper wants to select a random sample of 1000 registered voters to predict the outcome of the next election. If they randomly select 350 republicans, randomly select 400 Democrats, and randomly select 250 Independents, did this sampling procedure result in a simple random sample of registered voters from this state? Answer yes or no and YOU MUST EXPLAIN Clearly!
NO! Not every group of 1000 possible groups in the entire population have an equal opportunity of being chosen.
Consider the following statistics:
Mean, median, IQR, Standard deviation, variance, correlation coefficient.
Of theses, which are considered "resistant" measures?
What is the median and IQR?
Each year students take a standardized math test. For 4th graders, the average was 55.1 with a standard deviation of 12.3. In 3rd grade, the average 61.7 with a standard deviation of 14. The correlation between the two sets of scores is r = 0.95. Calculate the equation of the Least Squares line used to predict a 4th grade score from third grade score. You can use your book for this question.
y - hat = 3.60 +0.835x
Type of animal Mr. McAfee ran over on his first date?
What is a cat?