Definitions
What is population mean?
If n = 13, what do we have to assume the shape of the population is if we want our sample to be appropriate for a one-sample t-interval?
What is bell-shaped/normal?
22 companies were sampled on how much money they made last week. With a sample average of $316 and a standard deviation of $89, what is the upper bound of a 95% confidence interval for the population mean? Round to the nearest whole number.
What is about $355?
Which calculator function is used to find z*
What is InvNorm?
Within 4 units of 10, what would be the lower bound and the upper bound?
What is 6 and 14?
What are the two assumptions that must hold for every problem in this section?
What is the sample should be a SRS and the population should have no outliers?
If I have a confidence interval (238, 462), what is the margin of error?
If the margin of error and xbar is known, how can we find the lower bound and upper bound of the confidence interval?
What is (xbar - ME, xbar + ME)?
We should use a t-interval instead of a z-interval when...
What is when sigma is unknown and the sample size is small?
If n is fixed and we want to make the margin of error smaller, what should we change?
What is lower C%?
What is the z-star critical value for the 98.7% confidence level? (Round to 3 decimal places)
What is z-star = 2.484?
What is the ME formula using the z critical value?
What sample statistics is the best point estimate of mu?
What is xbar/sample mean?
For this lesson, what are two distances that are equal to each other?
What is the distance between the LB and xbar & xbar and UB?
If we want to be 90% confidence our estimate is within 5 inches of the population mean, how many people's heights should we measure given we had a sample of 14 people with a mean of 71 inches and a standard deviation of 10 inches in height?
What is 11 people?
What is the ME formula using the t critical value?
What is ME = t-star * (s/sqrt(n))?
What is the critical value in terms of the t-distribution if we have a sample of 19 people?
What is t-star18
What is s/sqrt(n)?
At a 93% confidence, what is zstar? Round to the second decimal place.
What is 1.81?
How would we calculate the minimum sample size required to achieve a specific C% within a specific ME?