Exam 2 Review

Which is the equation for the standard score?

Which is the symbol for the sample mean?

r = 0.4 - describe the form, direction and strength of this relationship

You don’t need a baseline risk to calculate relative risk

Which of the following describe the center of the data

r = 0.9 - describe the form, direction and strength of this relationship

Which is the symbol for population mean?

Is it possible for this relationship to be described by r = 0.7?

Which is the symbol for sample standard deviation?

r = 1 means strong relationship, r = -1 means weak relationship

Events A and B are mutually exclusive. P(A) = .5, P(B) = .1, what is the probability either event A or B happen?

Z-scores correspond to percentiles of areas underneath the normal curve

Which of the following is true for this distribution?

r^2 measures the usefulness of regression prediction

Multiple sample proportions follow a normal, curve and we can use our normalcdf

mutually exclusive and independent are the same thing

What is the missing probability

Median is the value you observed the most in the data set

Adding up all possible events must give me 1 or 100%

The frequenting perspective of stats looks at long run events, personal-probability (bayes) uses your beliefs

what do we call r^2?

Quantiles separate the data into 4 equal sections each containing 25% of data

r can only be between -1 and 1

Which is the symbol for population standard deviation?

Which summary statistics would we report for this distribution?

Relative risk is the ratio of an event occurring in the exposed vs non exposed groups

Variance and Standard Deviation describe the spread of the data

x̄ is calculated by taking the sum of your observations and dividing by how many there were

What does the 5-Number Summary consist of?

To find the median of a data set with an odd number of observation, take the average of the middle two points

We would report the St.D to be 3.937

Which is the first quartile of this distribution?

Variance is the square root of standard deviation

All probabilities must be between -1 to 1

Which summary statistics would we report for this data

r values bigger than 1 and smaller than -1 mean perfect linear relationships

Describe the strength and direction of this linear relationship

If i tell you an event is certain, what is the probability of that event happening

Areas under the normal curve given by the z-table is always the area to the right

Write the equation of the regression line

r^2 can be between -1 and 1

Which of he following is the mean?

What is the percent variation in our response variable that we can explain with this least squares regression line

Which should we have more caution when we do?