5.1
5.2
5.3
5.4
6.1
100
What Has an infinite number of possible values that can be represented by an interval on the number line.
What is a Continuous Random Variable
100
Any x-value can be transformed into a z-score by using what formula?
x - mean over SD
100
Find the z-score that corresponds to the cumulative area .9750
What is z = 1.96
100
True or False? In a Sampling Distribution, the mean of the sample means is equal to the population mean.
True
100
What is the difference between a point estimate and an interval estimate?
A point estimate is a single value estimate an interval estimate is a a range of values.
200
Which Curve has the greater mean?
What is A
200
x = 34 mean = 12 SD = 14
What is 1.57
200
Find the z score that has 18.76% of the distributions area to its right
What is .8124
200
Show me an example of what a histogram looks like
On the board
200
What is the Margin of Error?
What is The greatest possible distance between the point estimate and the value of the parameter it is estimating for a given level of confidence, c.
300
Find the area under the standard normal curve to the left of z = 2.65
What is .9960
300
x = 14 mean = 20 SD = 17
-.35
300
Find the z score that corresponds to a cumulative area of .5726
What is z = .185
300
What is the formula for the standard error of the mean?
(See Notes)
300
Find the point estimate for the below set of data
20 22 45 22 31 22 45 50 40 23 42 22 26 27 28 33
33 34 34 40 29 26 27 49 48 50 22 21 20 36 31 44
What is 32.6
400
What is the area to the right of z = -3.20
What is 0.9993
400
A survey indicates that people use their cellular phones an average of 1.5 years before buying a new one. The standard deviation is .25 year. A cellular phone user is selected at random. Find the probability that the user will use their current phone for less than 1 year before buying a new one. Assume that the variable x is normally distributed.
What is 2.28%
400
Find the z-score that corresponds to P5
What is -1.645
400
The average math SAT score is 520 with a standard deviation of 115. A particular high school claims that its students have unusually high math SAT scores. A random sample of 40 students from this school was selected, and the mean math SAT score was 565. Is the high school justified in its claim? Explain.
See Slideshow, let students work with it
400
What is the formula for the Margin of Error?
(See Slideshow)
500
Find the area under the standard normal curve between z = 2.23 and z = .62
What is 0.2547
500
Triglycerides are a type of fat in the bloodstream. The mean triglyceride level in the United States is 134 milligrams per deciliter. Assume the triglyceride levels of the population of the United States are normally distributed, with a standard deviation of 35 milligrams per deciliter. You randomly select a person from the United States. What is the probability that the person’s triglyceride level is less than 80? Use technology to find the probability.
What is 0.0614327
500
Scores for the California Peace Officer Standards and Training test are normally distributed, with a mean of 50 and a standard deviation of 10. An agency will only hire applicants with scores in the top 10%. What is the lowest score you can earn and still be eligible to be hired by the agency?
What is about 63
500
The training heart rates of all 20-years old athletes are normally distributed, with a mean of 135 beats per minute and standard deviation of 18 beats per minute. Random samples of size 4 are drawn from this population, and the mean of each sample is determined. Find the mean and standard error of the mean of the sampling distribution. Then sketch a graph of the sampling distribution of sample means.
Since the population is normally distributed, the sampling distribution of the sample means is also normally distributed. (See slide show) mean 139 SD 9
500
Use the data about the grocery store employees and a 95% confidence level to find the margin of error for the mean number of hours worked by grocery store employees. Assume the population standard deviation is 7.9 hours.
What is 2.4 Hours? (See Slideshow)