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Unit 9 Do Nows
DO NOW #1: (New Seats)
Complete “Are you Ready” on Page 1082 of Module 22.
PRE-AP
HON
REG
Do Now #2
Use the same number line to plot two different boxplots.
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Connie: {82, 83, 84, 84, 85, 86, 86 }
Oscar: {64,70,71,84 ,95,94,96}
Find the Mean (to the nearest whole number)
Make the box plot for each data set by finding the five number summary
(Min, Lower Quartile, Median, and Upper Quartile, Max) the
Think about what can you say about the box plot when the mean is less
than the median? More than the median?
Finished early? Complete the frequency line plot on page 1095 (22.2)
Do Now #2 (Per 6)
Use the same number line to plot two different boxplots.
Connie: {82, 83, 84, 84, 85, 86, 86 }
Oscar: {64,70,71,84 ,95,94,96}
• Find the Mean (to the nearest whole number)
• Make the box plot for each data set by finding the five number
summary (Min, Lower Quartile, Median, and Upper Quartile, Max)
the
Do Now Reflection
Connie: {82, 83, 84, 84, 85, 86, 86 }
Oscar: {64,70,71,84 ,95,94,96}
• How is the data skewed?
• How does the mean compare to the median?
• What can you say about the box plot when the mean is less than the
median? More than the median?
• What does it mean that the median is not in the middle of the box?
• What does it mean when the mean=median.
Do Now #3
Pre-AP
Honors
Per 6
Do Now #3
Do Now #4 (All classes)
Make the probability distribution of a fair coin, flipped four times,
where X is the number of heads.
Make the histogram.
What is the probability of getting at least 2 heads?
Pick-up four papers at the front table
Do Now #5: Normal Distributions
• Suppose the mean weight (in pounds) of a newborn elephant is 200
pounds with a standard deviation of 23 pounds. (Lesson 23.2)
0. Find the percent of elephants that are between 177 and 223 pounds.
1. Find the percent of elephants that are no more than 212 pounds.
2. Find the percent of elephants that are no more than 205 pounds.
3. If you take a sampling of 15 elephants, what is the probability that
your sample has a mean weight of up to 198?
Pre-AP
Hon
Do Now #5: Normal Distributions
• Suppose the mean weight (in pounds) of a newborn elephant is 200
pounds with a standard deviation of 23 pounds. (Lesson 23.2)
0. Find the percent of elephants that are between 177 and 223 pounds.
1. Find the percent of elephants that are no more than 212 pounds.
2. If you take a sampling of 15 elephants, what is the probability that
your sample has a mean weight of up to 198?
Per6
Do Now #5: Normal Distributions
• Suppose the mean weight (in pounds) of a newborn elephant is 200
pounds with a standard deviation of 23 pounds. (Lesson 23.2)
0. Find the percent of elephants that are between 177 and 223 pounds.
1. Find the percent of elephants that are no more than 212 pounds.
Pre-AP
Do Now #6:
1. In your own words, describe The Central Limit Theorem
2. How do you make an interval that captures 95% of desired data?
3. If you finish 1 and 2: Mean= 30, standard deviation is 5. The data is
normally distributed. What percent of the data is between 23 and
33?
Do Now #6:
1. Mean= 30, standard deviation is 5. The data is normally distributed.
What percent of the data is between 23 and 33?
2. Mean= 30, standard deviation is 5. The data is normally distributed.
What percent of the data is between 21 and 32?
Hon
Pre-AP
PreAp
Hon
Do Now #7
Find the confidence interval for the proportion. Round to two decimal
places.
• In a random sample of 1625 families from a large state, approximately 273
of the families travel at least 300 miles away from home once or more each
year. Find a 95% confidence interval for the proportion p of families in the
state that travel at least 300 miles away from home once or more each
year.
Find the appropriate sample size. Round to the nearest whole number.
2. Henry owns a sport supply store and wants to know the mean amount of
revenue per week. He is aiming for a 90% confidence interval and a margin
of error of $200. Given that the population standard deviation is $600, what
sample size should Henry use?
PreAp
Hon
Do Now #7 (
Find the confidence interval for the proportion. Round to two decimal
places.
1. Rachael surveys a random sample of 80 students at her high school and
finds that 18 of the students have a part-time job. Find a 90% confidence
interval for the proportion p of students at Rachael’s school who have a
part-time job.
Find the appropriate sample size. Round to the nearest whole number.
2. Henry owns a sport supply store and wants to know the mean amount of
revenue per week. He is aiming for a 90% confidence interval and a margin
of error of $200. Given that the population standard deviation is $600, what
sample size should Henry use?
All classes
Do Now #8
1. Explain whether each situation is an experiment or an observational
study.
A teacher asks her students to write down everything they eat in a day
and then calculate the total number of calories consumed.
The studies described below are randomized comparative experiments.
Describe the treatment, the characteristic of interest, the treatment group,
and the control group.
2. A medical researcher collects data about a certain medicine. She asks
10 patients to take the medicine and another 10 patients to take a placebo (a
sugar pill known to have no effect). None of the patients knows which group
he or she is in. At the end of six months, the group taking the medicine
showed more improvement in its symptoms than the group taking the
placebo.