Show:
Catching Z's
Z Marks the Spot
Are You Ready for Area?
The Real World
Give Me a Sign
100
The formula that converts a data point over to the standard normal distribution so that we can use the z table?
What is z = (x - mean) / std deviation
100
If the population mean is 30 and the population standard deviation is 7.5, change 42 into a z-score.
What is 1.6
100
Find the area under the standard normal curve to the left of z=-1.23
What is .1093 ?
100
Suppose the prices of a certain guitar are normally distributed with a mean of $159. What percentage of buyers would pay less than $150 if the standard deviation is $15?
What is 27.4% ?
100
The symbol for a population mean
What is mu?
200
Using z scores (or the z table) is appropriate for data with this shape
What is normal or bell-shaped data
200

CLT: The number of eggs a female house fly lays during her lifetime is normally distributed with a mean of 800 eggs and a standard deviation of 100 eggs. Random samples of size 15 are drawn from this population and the mean of each sample is determined. Find the mean and standard error of the mean.

What is 800 and 25.82

200
Find the area under the standard normal curve to the right of z=1.75.
What is .0401 ?
200
The length of time people wait to ride a roller coaster is normally distributed with a mean time of 20 minutes and a SD of 6 minutes. Find the probability that you will wait more than 30 minutes for the ride.
What is .048 ?
200

The symbol for a population standard deviation

What is sigma? 

300
The mean and standard deviation of the standard normal distribution?
What is mean = 0 and standard deviation = 1?
300
Find the z-score for which 20% of the area lies to the left.
What is .84 ?
300

CLT: The mean heights of women in the U.S. (ages 20 - 29) is mu = 64 inches. If a random sample of 60 women (ages 20 - 29) is selected, what is the probability and the mean height for the sample is greater than 66 inches? Assume sigma = 2.9 inches.

What is 0?

300
The number of cars that go through the drive thru at Wendy's in a day is normally distributed with a mean of 120 and a SD of 30. What is the probability that more than 170 cars go through the drive-thru today?
What is .0475
300
The symbol typically used for "sample size"
What is "n" ?
400
Use the standard normal distribution to find P(z<-1.5 OR z>2).
What is .0896 ?
400
Find the z-score for which 10% of the data lies to the right.
What is 1.28 ?
400
Find the area under the standard normal curve between z=-2 and z=1.
What is .8185 ?
400

CLT: The mean heights of men in the U.S. (ages 20 - 29) is mu = 69.2 inches. If a random sample of 60 men in this age group is selected, what is the probability and the mean height for the sample is greater than 70 inches? Assume sigma = 2.9 inches.

What is .0163 ?

400

CLT: Suppose that in a population of voters in a certain region 38%38% are in favor of particular bond issue. Nine hundred randomly selected voters are asked if they favor the bond issue. 

Find the probability that the sample proportion computed from a sample of size 900900 will be within 55 percentage points of the true population proportion.

What is 0.9980?

500

CLT: mu = 120, sigma = 18, and n = 9 what are the mean and standard deviation of the sampling distribution?

120 and 6

500
Find the z-scores for which 96% of the distribution's area lies between -z and z.
What is 2.05 and -2.05?
500
Find the area under the standard normal curve between z=1.05 and z=2.24.
What is .1344 ?
500
The amount of corn chips dispensed into a 48-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean of 48.5 ounces and a standard deviation of 0.2 ounce. What chip amount represents the 67th percentile for the bag weight distribution?
What is 48.59 ounces?
500
The symbols for a SAMPLE mean and a SAMPLE standard deviation...
What is x-bar (x with a line on top) for mean AND s for standard deviation