NAME_ Worksheet: Week 7 1. a) In a survey of 1000 randomly selected households, 450 said they have at least two pets. We are interested in estimating the proportion of households that have at least two pets. What distribution should be used for the a
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2-25-09
EX. 1
: TWO SAMPLE Z-TEST
In a survey of 3420 college students attending private schools, 917 said they smoked in the last 30 days. In a survey of 5131 college students attending public schools, 1503 said they had smoked i
Formulas:
P(Ac) = 1P(A)
P(A or B) = P(A) +P(B)P(A and B)
P(A | B) = P(A and B) P(B)
P(A | B) = P(A), if A is independent of B
P(A and B) = 0, if A and B are mutually exclusive
E(X) =Pall k k P(X = k)
E(X + ) = E(X) +
E( X) = E(X)
E(X + Y ) = E(X
PSTAT 5A Your Name: Your TAs Name: Your Section Time:
PRACTICE TEST 1
Winter 2009
INSTRUCTIONS: FOLLOW CAREFULLY You have 50 minutes to complete this exam. You should attempt ALL questions. Anyone found copying another students work, or cheating in any ot
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2-23-09
Key idea #2 the sum (difference) of two normal r.v.s
sum (difference) of two independent normal R.V.s is nor with: mean = sum (difference) of individual means variance = sum of individual variances.
Let X 1 ~ N ( 1 , 1 )
The Decision and Conclusion: [null = claim]
H 0 : { } (claim) HA :{ } Reject H 0 at the level of significance : " There is sufficent evidence to reject the claim that ." Fail to Reject H 0 at the level of significance : " There is not sufficent evi
Summary: Normal Approximations
( independent trials in each sample)
X:
If n 30 then approximately where
X ~ N ( X , X )
X =
and
X = . n
P:
If np 10 and n(1 p ) 10 and binomial criteria hold
P then approximately
where
n = sample size
WEEK 5 MONDAY
SAMPLE STATISTICS
1
PERCENTILES Division of ordered data into: halves: median quarters: quartiles 100ths : percentiles Quartiles middle observation above the median and below the median Q1 = 25th percentile Q2 = 50th percentile = med
When your book uses the t distribution (assuming a
representative sample)
Population is normally distributed. unknown
(1) The
distribution of the population is perhaps unknown in detail, but not too different from normal.
(2)
and if n 30
Some o
PSTAT 5A Your Name: Your TAs Name: Your Section Time:
Practice TEST 2
Winter 2009
INSTRUCTIONS: FOLLOW CAREFULLY You have 50 minutes to complete this exam. You should attempt ALL questions. Anyone found copying another students work, or cheating i
PSTAT 5A PRACTICE TEST 3
PSTAT 5A TEST 2 FORMULA SHEET (You may not need to use all these formulas) Expected Value of a Discrete Random Variable:
E( X ) =
Variance of a Discrete Random Variable:
xp( x)
all x 2 2
Var ( X ) =
Binomial Distribution
WEEK 5
Lesson 4.2 Exercises 4, 6 Read Unit 5. Lesson 5.1 Exercises 1-5 Lesson 5.2 Exercises 1, 3 Lesson 5.3 Exercises 3, 4, 5, 6 Unit 5 self-assessment quiz
Additional Exercises (ask your TA for help or to check your work) 1. A wholesale distributo
WEEK 3 Read Section 3. Lesson 3.1 Exercises 6, 8, 10 Lesson 3.2 Exercise 2 Lesson 3.3 Exercise 3 Do Unit 3 self-assessment quiz. *IMPORTANT* On Test 1, for Binomial distribution questions, you will be expected to check the 4 Binomial criteria. These
WEEK 2 Read Section 2. Lesson 2.1 EXERCISES: 1,2,4 p. 49 Lesson 2.2 EXERCISES: 1,2,3 p. 58 Lesson 2.3 EXERCISES: 1,2,3 p. 69 Read Avoiding Common Mistakes and Summary pp. 71-72 at end of chapter Unit 2 self-assessment quiz. p. 74