Various Variables
A random sample of 12 people had a mean of 36 vacation days. Assume the standard deviation is 1.3.
What is the mean?
36
What is the z value for a 90% confidence interval?
1.65
This is another word for the "average."
Mean
5+14?
19
A random sample of 36 adults were asked how much candy they consume in a year. The sample mean was 12 pounds, with a standard deviation of 5.
What is the standard deviation?
5
What is the z value for the 95% confidence interval?
1.96
This takes the form of the greek letter, sigma
Squareroot of 49?
7
90 college students were asked how many hours they study per week. There was a sample mean of 30 hours a week, with a standard deviation of 9.
What is the total number of trials?
90
What is the z value for the 99% confidence interval?
2.58
Signified by "E," and states within what range the desired sample size should be in
Margin of error
Squareroot of 100?
10
A researcher is estimating the daily average amount of water consumed per person within 10 liters. She wishes to be 90% confident, and a previous study showed there to be a standard deviation of 5.6 liters.
What is the margin of error?
10
If the z value is 1.65, what is your confidence percentage?
90%
This is another word for a bell curve.
Normal distribution
12+9+4?
25
A student is conducting an experiment to find how much money a person spends on birthday presents within $2. They want to be 95% confident, and a previous experiment showed there to be a standard deviation of $4.67 and a mean of $25.
What is the margin of error?
2
If the z value is 2.58, what is your confidence percentage?
99%
What is the difference between the mean represented with an X, and the mean represented by a greek letter?
(Ms. M, draw what you mean here please).
One is the population mean and one is the sample mean.
5-2(26/13)?
1