Ch 12 Review Walk Through

​Ch 12 Statistic Unit Test
Walk-Through

​Stem Plots (look for a key)

​= 09, 12, 19, 22, 26, 28, 31, 32, 33, 39, 43

​Frequency Tables

​= 1, 5, 5, 5, 6, 6, 6, 7, 7, 9, 10

​Bar Graphs

​= 18, 19, 17, 17, 15, 16, 12, 17, 21

Math Response

Find the mode of the Bar Graph.

Type answer here

Correct Answer: 5

Deg^°

Rad

​Box Plots

​Q0 = 3

​Q1 = 5

​Q2 = 6.5

​Q3 = 8

​Q4 = 11

​Box Plots

​Q0 = 3

​Q1 = 5

​Q2 = 6.5

​Q3 = 8

​Q4 = 11

25%

25%

25%

25%

Multiple Choice

Find the Quartile 3 of the box and whisker plot.

• 58

• 64

• 60

• 66

Multiple Choice

What percentage of the heights are shorter than 60 inches?

• 75

• 50

• 60

• 25

​Give the Q1 for the data set.

​Desmos Commands
Q4 - quartile(x1,4) also Q0, Q1, Q2, Q3
Mean - mean(x1)
Standard Deviation - stdev(x1)
Box Plot - boxplot(x1)
Linear Regression - y1~x1m + b

to find m, b, r

Multiple Choice

Given the data: 136, 150, 119, 150, 125, 140.
Find the upper quartile (Q3).

•  125
• 150
• 139.5
• 143

​Center
Mean
Median
Mode

​Spread
Range
Interquartile range
Variance
Standard Deviation

​

​Center
Mean
Median
Mode

for ​catagories like
color
candy
favorite school subject

​The weight of babies born in the United States is assumed to be normally distributed. The mean weight of babies born in the U. S. is 7 pounds 9 ounces or 121 ounces with a standard deviation of 17 ounces. What percent of the babies are between 138 and 155 ounces?

​The weight of babies born in the United States is assumed to be normally distributed. The mean weight of babies born in the U. S. is 7 pounds 9 ounces or 121 ounces with a standard deviation of 17 ounces. What percent of the babies are between 138 and 155 ounces?

​1. Find z-score for 155 and 138
2. Find % from table
3. Big % minus small %

Fill in the Blanks

​The weight of babies born in the United States is assumed to be normally distributed. The mean weight of babies born in the U. S. is 7 pounds 9 ounces or 121 ounces with a standard deviation of 17 ounces. What percent of the babies are between 138 and 155 ounces?

Multiple Choice

If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall? 

• -5
• -2
• 2
• 5

​SD = 7

+7

+7

+7

+7

+7

+7

Multiple Choice

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have more than 7 accidents?

• 0.3446
• 0.2856
• 0.4
• 0.6554

​1.0
0.9
0.7
0.5
0.3
0.0
-0.3
-0.7
-1.0

​Positive Perfect
Positive Very Strong
Positive Somewhat Strong
Positive Weak
Positive Very Weak
No Correlation
Negative Very Weak
Negative Somewhat Strong
Negative Perfect

Multiple Choice

What is the z-score for an 18-year-old in a group of people with the following ages?

15, 17, 20, 23, 24, 25, 30

• -0.78

• -0.81

• 1.25

• 3.1

Fill in the Blanks

Data: 8, 6,12, 38, 24, 10, 12, 20

Find the percentage over 22.