Probability
The proportion of an event occurring can be any number between ____ and ____.
What is 0 and 1
You ask 300 people how happy they feel on a scale from 1 to 100. Estimate the mean happiness.
What is a Confidence Interval for a Population Mean
The probability of getting a result as extreme or more extreme by chance if the null hypothesis is true.
What is a p-value.
If we do not know our population standard deviation, we should use this table.
What is a T-table
We have the following linear function describing number of books someone owns based on their age:
y=0.55x+12
How many books would we expect for someone to own if they are 55 years old?
What is 42.25
The probability that an event does not occur is equal to
What is 1 minus the probability that the event does occur.
How likely are drivers to come to a complete stop at a stop sign? A researcher placed hidden camera at a stop sign and observed 150 cars to see if they came to a complete stop.
What is a Confidence Interval for a Proportion
If you calculate a point estimate then you add and subtract a margin of error from either side of that point estimate.
What is a confidence interval
How do you calculate degrees of freedom on a T-table
What is n-1
What is the null hypothesis for a linear regression t-test?
Ho: There is no significant linear relationship between x & y
Two events that cannot occur at the same time
What is mutually exclusive
Are dogs messier than cats. 50 dogs and 50 cats were observed to see how many pieces of their dry food was scattered next their bowls after eating.
What is a Hypothesis Test for the Difference Between 2 Means
The significance level is also known as this.
What is alpha
The four digit decimals on a z-table represent
What is the area to left of a given point under a normal density curve
Predictor Coef St. Dev
Constant 71.950 1.053
Age .3833 .0204
s=0.3873 R-sq = 98.9%
What is:
y=.3833x+71.950
If there is a 35% chance of rain every day this week, and each day is independent of the other days, what is the probability that it will not rain at all over the next 5 days?
What is 11.6%
Do customers at Safeway wait in the checkout line on average longer than 5 minutes? 150 randomly selected Safeway customers were observed.
What is a Hypothesis Test for a Population Mean
Rejecting the Null hypothesis when in fact the Null is true.
What is a Type I error
What is the z value for a one tailed test with an alpha of .025
What is 1.96
From the following, calculate the t statistic:
Predictor Coef St. Dev
Constant 71.950 1.053
Age .3833 .0204
s=0.3873 R-sq = 98.9%
What is:
(.3833 - Ho)/.0204
(.3833-0)/.0204
t=18.79
Suppose you have a 50% chance of making a shot on the basketball court. If you take 10 shots, what is the probability that you make more than 4?
Do people smoke less when the cigarettes cost more? 500 people were tracked before a 30% cigarette tax was imposed and after the tax was imposed.
What is a Hypothesis Test for Paired Data (Dependent Samples)
The probability of not making a Type II error.
What is Power
If the mean is 6, and standard deviation is 2. What is the probability that on observed value is greater than 9?
What is .0668.
Calculate the residual for (8,8) given the following data:
x y
3 6
9 7
12 10
15 16
17 20
What is 8 - 8.616
residual = -.616