1. Stat 226

2. Population, parameter, statistic, sample
Which goes with which?

3. Population, parameter, statistic, sample
You are looking at the average age of all American alligators, you select 15 alligators off the coast of Florida and track them to see how old they become. The average of these 15 live to be 12. The true average age alligators live to is 16.

4. Population, parameter, statistic, sample
Your dog can jump 2.5 feet. This leads you to believe your dog can jump farther than any other dog. However, the American record book has a dog that can jump 6.48 feet.

5. Population, parameter, statistic, sample
The Iowa state football team has an average height of 6’2”. The NCAA average height for football players is 6’. You then conclude the ISU team is pretty tall.

6. Categorical or quantitative
Top 10 websites
Number of roll – over car accidents based on car brand
The baggage fees for different airlines collected each year
Price of cars people purchased in 2008
Regional rain fall
sales for 4 types of smart phones
Height of 200 random people in Iowa
Net Income
Wine exports of the top 5 wine-exporting countries

7. Categorical or quantitative
Histogram
Bar Graph
Pie Chart
Box Plot
Pareto Chart

8. Create a visual
The following table presents the sales of cars in the US broken down by manufacturer
Manufacturer
Car Sales
Chrysler
107,172
Ford
166,441
General Motors
180,402
Honda
83,925
Nissan
85,182
Toyota
137,960

9. 10 9 8 4 2 8 9 5 8 6 7 8 3 What is the sample size Find the median
What is the sample size
Find the median
Find the IQR
Find the mean
The standard deviation in 1.38, what is the variance?

10. Number summaries
When is the 5 number summary used over the mean and standard deviation?

11. What is this graphic called?
What is an advantage to having them side by side?
Give the 5-number summary for Honda
What is the shape of the distribution of Nissan?
For which of the two distributions do you expect the corresponding mean to be closer to the median?
Compare and contrast both distributions regarding their overall shape, center, spread and For the center and spread do not simply state the numerical values but explain how they compare for both dealerships
Car prices
Honda 83
Nissan 62 64
Price (in 1000s) 43 38 35 25 24 23 16

12. Normal distribution What is the empirical rule tell you?
What is the equation relating Z-score to Mean, standard deviation, and your value of X?

13. Swim team times
The times for the 100m freestyle for the womens swim team is evenly distributed with a mean of 59.6 sec. and a standard deviation of 1.2 seconds.
What time can 50% of the teammates complete a 100m freestyle in?
What percent of swimmers can complete a 100m freestyle between 58.4 seconds and 60.8 seconds.
Jane brags that she can swim the race faster than 95% of her teammates? What would her time be?
If Jenny is wanting to make the team and she can swim a 100 m freestyle in 61 seconds, do you think she would make the team?
What is the probability that one of the girls will beat the opponents fastest swimmer that can swim a 100 m freestyle in 57 seconds?

14. Z-score
What does a z-score tell you?

15. USING z scores P (Z < 1.5) P(Z < z) = 0.35 P (Z > - 1)
P(-z < Z < z) = .78