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
The midpoint of a confidence interval is
What is a point estimate/sample mean
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 cluster sampling
Two events that cannot occur at the same time
What is mutually exclusive (disjoint)
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
How do you calculate expected counts in a chi square GOF test
What is row total * column total / total total
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 1 error
What is the z value for a one tailed test with an alpha of .025
What is 1.96
Spot the error in this conclusion AND reword correctly:
Ho: Temperatures aren't increasing
Ha: Temperatures are increasing
Because the p value (0.01) is less than .05, we cannot reject the null hypothesis and conclude that temperatures aren't increasing.
Because the p value (0.01) is less than .05, we can reject the null and have significant evidence that temperatures are increasing
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?
What is 62.3%
You believe that a company is underselling soda cans. They advertise 120z, but you take a sample of 100 cans and fine the sample mean to 11.5oz with a standard deviation of 0.3oz.
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
Identify shape, center, and spread
min: 10
Q1: 14
med: 18
Q3: 29
max: 41
What is:
Skewed right
18
10-41 (spread), 31 (range), 15 (IQR)