DEFINITIONS
, : mean and standard deviation, respectively, of a probability distribution. The mean describes the center, and the standard deviation describes the spread of the
probability distribution
1 in k systematic sampling: sample selected from an or
Definitions
1. Probability: number btwn 0 and 1 that reflects the likelihood of occurrence of some
outcome
total
sample
a. Denoted P(event) =
for event
b. The sum of all probabilities over outcomes is 1
2. Combining events
a. The compliment (opposite) of
Null hypothesis: H0
Alternate hypothesis: Ha (testing against)
Point estimate: single number that is based on ample data and represents a plausible value of a population parameter ('best
guess')
Population parameters
Point estimate
Population mean:
Sampl
STA 270 APPLIED STATISTICS
Homework #3 (Due Tuesday, October 6)
1. Problem 6.3 (page 310)
2. Problem 6.12 (page 311)
3. Let X represent the explanatory variable, the individual being a smoker, and Y
represent the response variable, the presence of lung ca
STA 270 APPLIED STATISTICS
Homework #4 (Due Thursday, October 15)
1. Problem 7.47 (page 382)
2. Problem 7.48 (page 382)
3. Karla took a test that calculates her aptitude in three subjects. She was told that the
scores in each of the three areas are normal
STA 270 APPLIED STATISTICS
Class Homework #0 (Due Thursday, September 3)
1. Please write something about yourself (e.g., interests, hobbies) that will help me remember
you.
2. Please introduce yourself to someone you dont already know in the class. To ans
STA 270 Practice Problems 1
1. A major news corporation conducts an opinion poll by asking a random sample of 1500 U.S.
citizens the following question: Who do you plan to vote for in the next Presidential election?
a. What is the population?
b. What is t
STA 270 APPLIED STATISTICS
Class Homework #1 (Due Thursday, September 10)
The following three exercises are from Chapter 1 (pages 1 30).
1. Problem 1.2
2. Problem 1.5
3. Problem 1.18. Part (a) only
4. Problem 1.19 Part (a) only
5. Problem 1.22 (Hint for p
Homework 6
9.34
a)
b)
c)
d)
e)
90%
95%
95%
99%
99%
9.38
a) It is assumed it is completely unbiased
b) No, the score shouldnt be used when the sample size is 30 or above
9.42
a) (510.20, 549.80) Must be unbiased.
b) 42
9.43
a) Narrower
b) Doesnt work, the
Homework 4
1. a. 0.2611
b. 0.1977
c. 0.4053
d. 0.5
2. Statistics are variables entered in a distribution and describe a sample. Characteristics are
just aspects and elements of the population
3. X bar symbolizes the sample mean while Mu is the mean of the
STA 270 Exam Two Name 9:” ‘
SHOW ALL WORK!
1) The following questions are in a True / False format. Before answering these
questions, be sure to read them carefully! [3 points each)
@ F a. The probability of an event E can always be computed using the for
Study guide, exam 1 STA 270 Daugherty
Terms, concepts and skills required:
Descriptive Statistics and inferentiai Statistics
Numerical, discrete , continuous, and categoricai data types
Calculate and interpret relative frequency. Define and use the term f
Daphne Dupont
STA 270
Assignment 11
1 April 2014
10.36
1) The population characteristic of interest is the proportion of US adults who would not be
bothered if the NSA accessed their phone records.
2) H0: p=0.5
3) H : p>0.5
4) = 0.01
5) np>10 0.5(502)= 25