MATH250
CHAPTER 1 AND 2
Question 1
A
B
Classify the following random variable according to whether it is discrete or
continuous.
The number of cups of coffee sold in a cafeteria during lunch
continuou
Calculator Notes (9.3)
Your TI-83/84 calculator will find the proportion for you. You will need only the values for x, n
and the level of confidence. Access the STATS menu by pressing [STAT]. Then scr
Course
CHAPTER
Question 1
Construct a boxplot for the given data. Include values of the 5-number summary in all
boxplots.
A
The ages of the 35 members of a track and field team are listed below. Const
Question 1
0 / 1 point
The probability that a randomly selected individual in a country earns more than $75,000 a year is 6.5%.
The probability that a randomly selected individual earns more than $75,
Question 1
Provide an appropriate response.
0 / 1 point
A card is drawn from a standard deck of 52 playing cards. Find the probability that the card is a an ace or
a king.
a)
b)
c)
d)
ComplementRulePr
Question 1
Provide an appropriate response.
1 / 1 point
A private opinion poll is conducted for a politician to determine what proportion of the population
favors adding more national parks. How large
HypTest1
Question 1
Provide an appropriate response.
1 / 1 point
Suppose you are using = 0.01 to test the claim that > 38 using a P-value. You are given the sample
statistics
and
Find the P-value.
a)
Week 1 Notes
This week we cover Chapter 1 and Chapter 2. Each week, we will provide these lecture notes
that offer an overview of what is important in the sections covered during the week and more
imp
Week 2 Notes
In Chapter 3, we summarize the data by looking at some specific measures. Instructions to find
the mean and median using the TI-83/84 can be found on p. 130 and below. You can find a TIca
Section 5.1 Probability Rules
We will be making extensive use of fractions, decimals, and percents in this chapter. If you
need a review of these concepts, take a moment to do it now either in a previ
Week 6 Notes
Section 9.1 The Logic in Constructing Confidence Intervals about a Population Mean
At the beginning of chapter 9, we discuss confidence intervals. Until now, we only had point
estimates t
Week 7 Notes
Chapter 10 Notes
Chapter 10 is the culmination of all of your hard work this session. We are going to use the
statistical methods we have learned so far to test the validity of claims (ca
Chapter 2 Example, similar to #36 in section 2.2
The following data represent the number of customers waiting for a table at 6:00 PM for 40
consecutive Saturdays at Bobaks Restaurant:
11
8
4
10
6
4
8
Calculator Notes (9.2)
Finding a t-confidence interval is nearly the same as finding a z-interval. From the STATS ->
TESTS menu, scroll down to the 8th entry: TInterval and press [ENTER]. Once again,
Calculator Notes (Section 3.1)
Of course, we want to be able to compute statistical values efficiently on the calculator. To do
that, we need to enter the data into a list where it will be stored unti
Calculator Notes (Section 3.2)
So, how do we calculate these statistics? You have actually already learned how to calculate
them on the calculator. Once you have entered your data into lists and click
Calculator Notes (Section 3.3)
Grouped Data Example:
Listed below is a grouped frequency distribution for 30 business executives. Find the mean from
the grouped frequency distribution.
To enter the da
Calculator Notes (6.1)
Example 5 p. 296
We are given the probability distribution in Table 3 on p. 296. We will go to Stat, Edit, and then
put 0, 1, 2, and 3 into L1. Then, using your right arrow key,
Calculator Notes (6.2)
Example 2, p. 306
First, I determine that the success in this problem is blood type O-negative and that the probability of this is
0.07. I am selecting four people. So, my n = 4
Calculator Notes (7.1)
Calculating Z-Values
Remember to use parentheses on your TI when calculating z-values. For example, to calculate
the Z-value for the x value of 35 with a mean of 38.72 and a sta
Calculator Notes (7.2)
Check out the youtube video on the calculator usage and try that before you follow these notes.
http:/www.youtube.com/watch?v=9N0F4IHong4&feature=channel
Problem: Find the area
Calculator Notes (7.3)
We go through each example in the textbook with technology so you can see how much quicker
it is than using the tables.
Example 1, p. 349
Draw picture like Figure 35 on p. 350.
Calculator Notes (7.4)
Look at the data in problem #9. We would start by entering the data into list 1 in the calculator.
Press [2nd] [y =] to access the [StatPlot] area. You should see
Make sure that
Calculator Notes (8.1)
The normalcdf command is again used in section 8.1, but we will be using the standard error of the
mean in place of the standard deviation in problems involving the Central Limi
Calculator Notes (8.2)
In this section, you will be using normalcdf again to calculate probabilities. We will be using the fact that
mean of the sampling distribution of is p, and the standard deviati
Calculator Notes (9.1)
We need to know FOUR quantities:
, x , n and the level of confidence you want.
NOTE:
must be known and the population must be Normally distributed (or n > 30 )! On
the calculato
Calculator Notes (4.1)
In section 4.1, you will not be asked to compute r, the correlation coefficient, by hand. Just to be
very clear, you are not required to compute this value by hand. Use your TI-