Proportions
Best estimate to a population proportion
Sample Proportion
What is the difference between x bar and mu?
Sample versus population mean
Z score for 90% CI
1.65
when you are estimating the population mean
(pop standard deviation known)
Normal dist/ Z-chart
What is the only food that will never spoil?
Honey
Equation to find the sample proportion
P hat = x / n
What is the best estimate for the population mean?
Sample mean
Z score for 95% CI
1.96
When you are estimating the population proportion
Normal dist/ Z-chart
M&M's fruit chews would eventually become what popular candy?
Starburst
What is the sample proportion: (as a decimal)
14 out of 20 kids surveyed in this stats class think there are sharks in lake winnipesaukee.
(False) 0.7
How does one compute the mean?
Sum of all data divided by number of entries
Z score for 99% CI
2.58
when you are estimating the population mean
(pop standard deviation unknown)
t-dist or t-chart
In what ocean could you find the Bermuda Triangle?
Atlantic Ocean
How does one find q hat and what is it?
1 - p hat (complement or probability of not happening)
How does one estimate a population mean using a sample mean?
Use a confidence interval
T score when given 90% CI and df = 8
1.86
when you are estimating the population mean
(sample standard deviation unknown)
t dist/t chart
Fill in the blank. Ice cream has no ______ and men's vest have no ____________.
bones, sleeves
How does one find the error to confidence intervals that use the sample proportion as their point estimate?
Error = z score *(sqrt of phat times q hat all over n)
Mystery Spot! Click to reveal your prize!
A helping hand: Take 200 points from your team and 300 points from another team and give the 500 points to a less fortunate team.
T score when given 99% confidence and sample size of 20
2.86 (exact)
True or False. All tests in this unit can still be conducted even if the distribution is not normal.
False, they must be normal distributions.
What color car gets the most speeding tickets?
White