Question 1
0.2 / 0.5 pts
Here are the summary statistics for the weekly payroll of a small company:
Lowest salary = 250, mean salary = 500, median salary = 500, range =
1050,
IQR = 300, Q1 = 350, stan
STA2023 Worksheet #1
The following problems come directly from the assigned homework.
They are due on or before the last day of testing for Test 1.
If you have been keeping up with the homework all al
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Insurance
A 26-year-old woman takes out a $12,000 one-year life insurance policy that
costs $130. Mortality tables indicate that the probability that a 26-year-old
women will die within a year is 0.00
Chapter 1
1. A recent newspaper article reported on American's eating habits. The article reported that only about one third of American adults ate 2 or
more servings of fruit per day, and only 26% at
OUTLINE 4 INFERENCE FOR ONE PROPORTION (CH 16 & 17)
HW: Worksheet Inference For One Proportion
A population proportion can be described as the number of observations with a certain characteristic divi
STA2023
Review Unit 3 (Ch 15 18, 20-21)
Chapter 15:
Recognize the definition of the law of large numbers
Recognize the definition of the Central Limit Theorem
State the sampling distribution of x or p
WORKSHEET INFERENCE FOR ONE PROPORTION
1) A TV newscaster reports the results of a poll of voters, and then says, The margin of error is plus or minus
4%. Explain carefully what that means.
2) Several
OUTLINE 2 CONFIDENCE INTERVALS FOR ONE MEAN (CH 16 & 18)
HW: Worksheet Confidence Intervals for One Mean
_ drawing conclusions about a population from sample data.
All the methods in this course assum
WORKSHEET INFERENCE FOR COMPARING 2 MEANS
For each problem decide if 2 dependent or 2 independent samples.
1) A researcher suggests that female nurses earn more than male nurses. A survey of 20 female
WORKSHEET HYPOTHESIS TESTS FOR ONE MEAN
Performs the appropriate hypothesis test or confidence interval for each problem. Consider whether you should
be using a T or a Z. Assume all populations are ap
WORKSHEET INFERENCE FOR 2 PROPORTIONS
1) The Centers for Disease control and Prevention reported a survey of randomly selected Americans age 65
and older, which found that 411 of 1012 men and 535 of 1
WORKSHEET CONFIDENCE INTERVALS FOR ONE MEAN
For each problem decide if you should use the T-distribution or the Z-distribution. Assume all populations approximately
normally distributed when necessary
REVIEW CHAPTER 15
1) It is believed that the distribution of the number of days an employee missed from work per year at a chain
grocery store has a mean of 9 days with a standard deviation of 3.7 day
OUTLINE 1 - Chapter 15 Sampling Distributions
HW: Pg 419 # 1, 5, 13ab and make c can you estimate the probability that the next 40 parties will tip an
average of at least $10? Explain. If yes, find th
OUTLINE 3 HYPOTHESIS TESTS FOR ONE MEAN (CH 17 & 18)
HW: Worksheet - Hypothesis Tests for One Mean
The goal of confidence intervals was to estimate a parameter.
The goal of hypothesis tests is to asse
OUTLINE 5 - INFERENCE FOR COMPARING 2 MEANS (20B & 21)
HW: Worksheet Inference for Comparing Two Means
Previously we compared a population mean to a constant value.
Ex: Is there sufficient evidence to
OUTLINE 6 - INFERENCE FOR 2 PROPORTIONS (CH 20A)
HW: WORKSHEET- INFERENCE FOR 2 PROPORTIONS
This section compares two population proportions instead of one proportion to a fixed value.
A logical estim
APPENDIX D Tables and Selected Formulas A-SE
Table Z Second decimal place in z
Areas under the 0.09 0.03 0.07 0.06 0.05 0.04 0.03 0.02 0.01
standard Normal curve 0 0000+ 73 9
0.0001 0.0001 0.0
ANSWERS REVIEW CH. 12-14
1) a) No, one probability is <0. b) Yes. p( x) 1 and 0 p( x) 1 c) No, p( x) 1.05 1
2) P(W)=.15, P(F)=.08, P(C) = .77 a1) 1-.08=.92 a2) .08+.15=.23
b1) (.77)3 .4565 b2) P(all c
WORKSHEET 14
1) Based on data from the Statistical Abstract of the United States, the probability that a newborn baby will be
a girl is roughly 0.487. In the next three births, what is the probability
Chapter 14b The Binomial Distribution
HW: Binomial Distribution Pg 387 # 7 and Worksheet 14
Recall: Data or distributions can be classified as continuous or discrete.
The _ is a discrete distribution
Chapter 14a Random Variables
HW: Pg 387 # 1, 3, 15, 17ab, 21, 23, 25, 29, 31, 33, 37
A _ is a variable that takes on the values of a random event. Capital letters like X are
used to represent these va
Chapter 13 Probability Rules
HW: Pg. 356 # 1, 3, 7, 15ab, 19 37 odd, 39bc, 41, 45
Recall: If events A and B are disjoint, then they have no elements in common and
P( A or B ) = P ( A) + P ( B)
What if
Chapter 12 From Randomness to Probability
HW: Pg. 334 # 3, 5, 7, 11, 15, 19, 21, 27 33 odd, 39, 41 a-b, 43 49 odd
Flipping a coin produces _ results because no one can predict if it will land on heads
STA2023
Test 1 Review
The following are topics you should have mastered before taking the test.
Chapter 1 & 2
Be able to label data as categorical or quantitative if given in sentence format or paragr
TI-83 COMMANDS - Descriptive Statistics and Graphs
Entering Data
<Stat> , Edit, enter data
To erase column of data:
Arrow up to L] , <Clear>, <Enter>
Histogm
<2"d>,<Y=> (gives stat plot), 1, on <enter