1. The value given below is discrete. Use the continuity correction and describe the region of the normal
distribution that corresponds to the indicated probability.
Probability of exactly 3 passengers who do not show up for a flight is
The area between 2
Ch. 5 Homework (13 problems)
1.
a) Continuous random variable
b) Continuous random variable
c) Not a random variable
d) Continuous random variable
e) Continuous random variable
f) Continuous random variable
a) Discrete random variable
b) Continuous random
1. A margin of error of 100 points seems too high to provide a good estimate of the mean score
Z alpha/2=1.96
2. Find the critical value z Subscript alpha divided by 2 z/2 that corresponds to alpha=0.20
Z alpha/2= 1-0.20/2 =0.9
Z 0.1=1.28
3.
4. Use the sa
Ch.6.2 & 6.3 HW
1. Find the indicated z score. The graph depicts the standard normal distribution with mean 0 and standard
deviation 1.
The indicated z score is 2.16
2. Assume that a randomly selected subject is given a bone density test. Those test score
1. Using the simple random sample of weights of women from a data set, we obtain these
sample statistics: n=40 and x overbar=145.02 lb. Research from other sources suggests
that the population of weights of women has a standard deviation given by =30.08 l
Stats: Correlation & Regression
Definitions
Coefficient of Determination
The percent of the variation that can be explained by the regression equation
Correlation
A method used to determine if a relationship between variables exists
Correlation Coefficien
Stats: Counting Techniques
Definitions
Factorial
A positive integer factorial is the product of each natural number up to and
including the integer.
Permutation
An arrangement of objects in a specific order.
Combination
A selection of objects without rega
Statistics: Data Description
Definitions
Statistic
Characteristic or measure obtained from a sample
Parameter
Characteristic or measure obtained from a population
Mean
Sum of all the values divided by the number of values. This can either be a
population
Stats: Estimation
Definitions
Confidence Interval
An interval estimate with a specific level of confidence
Confidence Level
The percent of the time the true mean will lie in the interval estimate given.
Consistent Estimator
An estimator which gets closer
Statistics: Frequency Distributions & Graphs
Definitions
Raw Data
Data collected in original form.
Frequency
The number of times a certain value or class of values occurs.
Frequency Distribution
The organization of raw data in table form with classes and
Stats: Hypothesis Testing
Definitions
Null Hypothesis ( H0 )
Statement of zero or no change. If the original claim includes equality (<=, =, or
>=), it is the null hypothesis. If the original claim does not include equality (<, not
equal, >) then the null
Stats: Normal Distribution
Definitions
Central Limit Theorem
Theorem which stats as the sample size increases, the sampling distribution of
the sample means will become approximately normally distributed.
Correction for Continuity
A correction applied to
Stats: Probability Distributions
Definitions
Random Variable
Variable whose values are determined by chance
Probability Distribution
The values a random variable can assume and the corresponding probabilities
of each.
Expected Value
The theoretical mean o
Stats: Probability
Definitions
Probability Experiment
Process which leads to well-defined results call outcomes
Outcome
The result of a single trial of a probability experiment
Sample Space
Set of all possible outcomes of a probability experiment
Event
On
Statistics: Introduction
Definitions
Statistics
Collection of methods for planning experiments, obtaining data, and then
organizing, summarizing, presenting, analyzing, interpreting, and drawing
conclusions.
Variable
Characteristic or attribute that can a