Chapter 1
Is the following an observational study or designed experiment?
Fred wants to know whether there is a correlation between drinking chocolate milk and ear infections. He creates a survey and sends it to a random sample of participants asking how much chocolate milk they drink a year and how many ear infections they get on average in a year.
Observational Study
Qualitative
What is/are the mode(s) of the following data set? Is the following bimodal, multimodal, or no mode?
10, 20, 14, 15, 17, 19, 30, 21, 20, 10, 11, 12, 18
10 and 20. Bimodal
Where was Pafnuty Chebyshev born?
Russia
What musical instrument does Jack steal from the giant in Jack and the Beanstalk?
a Harp
What type of sampling method is being used:
Quinton wants to know how much gum people in his school chew in a month. He divides the class into each first period class and then surveys four people from each class.
Stratified
True or False: 3D Pie Charts are just as good as 2D pie charts.
False.
Determine the sample mean of the following:
4 5 7 8 11
7. For sample MEAN, you still divide by n. You only divide by n-1 for standard deviation and variance.
Is the following a statistic or parameter?
85% of Americans own a toothbrush.
parameter
What does the Richter scale measure?
The strength of earthquakes
What is the level of measurement of military rank?
Ordinal
Why don't we need a y-axis scale on a dot plot?
Because each dot represents 1, so we just need to count the dots.
Find the z score of the SAT score 1500 if the mean is 1350 and the standard deviation is 100
1.5
What is the IQR of the following data set:
3, 6, 9, 7, 2, 10, 7, 9, 7, 6
3
There are only two countries that start with the letter A, but do not end with the letter A. Name both.
Azerbaijan and Afghanistan
What type of observational study is this:
Framingham Heart Study: more than 10,000 people have been monitored since 1948. the study continues to this day with the grandchildren of the original participants taking part in the study.
Cohort
What is a Pareto Chart
A bar graph where the bars go in decreasing order
5, 8, 9, 7, 9, 3, 8, 8, 7, 10
Yes, 3 is an outlier.
Correctly identify ALL five symbols for each measure.
1. Sample standard deviation
2. Population mean
3. Z-score
4. Sample mean
5. Population variance
1. s
2. mu
3. z
4. x bar
5. sigma squared
The Gobi desert is located between what two countries
China and Mongolia
What type of bias is this:
A company wants to know people's thoughts on a certain political figures, so they call a simple random sample of people from ages 18-80.
Nonresponse bias: younger generations are less likely to pick up the phone than older generations causing a lack of representation of younger people in the survey.
Give three examples of data misrepresentations
Answers will vary
What percent of data is between 2.5 and 3.5 if the mean is 2 and the standard deviation is 0.5?
16%
Find the sample standard deviation for the following data set. Round to the nearest hundredth
2, 4, 3, 7
2.16
Name 8 (non-Woodberry teacher) mathematicians
Answers will vary