The first characteristic of a normal curve is that it is bell shaped with the highest point over what?
Correct answer -Mean
100
The graph of a normal distribution
Normal curve
100
If the mean is 60 and a standard deviation is 4. What is the z score 2 stadard deviations to the right?
Answer: 68
100
With a mean of 25 and a standard deviation of 6.One standard deviation to the right is 30 ?
False its 31.
100
What is the percent of the mean - two standard deviations and mean + two standard deviations?
95%
200
What is the second characteristic of a normal curve?
It is symmetrical.
200
A normal distribution with mean = 0 and standard deviation = 1.
Standard Normal Distribution
200
If one point falls beyond 3 standard deviations is the statistical data out of control?
YES!!!!!!!!!!!!!!!!!!!!
200
We use the z formula when they dont give us an x.
True
200
What is the percent of the mean - 3 standard deviations and mean + 3 standard deviations?
99.7%
300
Does the normal curve approach the vertical or horizontal axis ?
It approaches the horizontal axis.
300
Z Score is
The number of standard deviations the original measurement is from the mean.
300
Used cars at Harrys hand-me-downs has a mean car milage of 900 and a standard deviation of 50. What is the probability at random of a car having more than 800 miles?
47.5
300
To the right of ยต is exactly 72%. Is that true or false?
False correct answer-50%
300
What is the percent of the mean - 1 standard deviations and mean + 1 standard deviations?
68%
400
The transition (inflection) points between cupping upward and downward occur above what?
x- 1sd & x + 1sd
400
standard deviation * z + mean = x
What is the equation for x?
400
Billy earned a 178 on his art midterm.The class midtem grade mean score is 150 and a standard deviation of of 10.Convert to a standard z score.
2.8
400
Is it true that when the values increase, the areas to the left of z inrease?
True
400
What is the percent of the mean - 2 standard deviations and mean + 3 standard deviations?
97.35
500
The highest point of the curve lies where?
Over the mean.
500
Provides a way to monitor a variable over a period of time.They also provide a warning mechanism by using past occurences of the mean and standard deviation to signal out of control situations
Control Chart
500
Is -3.10 z score above or below the mean?
below
500
Is it true that when a z value is positive, the area to the left of z is greater than 0.2000 and less than 0.5000?