12 . (VIEJO)
x values (IQ)
xbar = 108.9
Sx = 13.17
y values (GPA)
ybar = 7.447
Sy = 2.10
Equation of LSL = Regression line (y^ calculation)
y^ = b0 + (b1) x
y^ = Altered Response variable (y value changed by x) = GPA
x = Explanatory variable (value that c
5.13
When a particular penny is held on its edge and spun, the probability that
heads are face up when the coin comes to rest is 4/9. If the coin is spun 4
times, the probability that the coin will come up heads exactly twice is
(assume trials are indepen
Question 1
Determine whether each of the following statements is true or false.
A) The margin of error for a 95% confidence interval for the mean increases as the sample size
=
D) The sample size required to obtain a confidence interval of specified margi
12. (NUEVO)
x values (IQ)
xbar = 108.9
S.D. of x = 13.17
y values (GPA)
ybar = 7.447
S. D. of y = 2.10
Equation of LSL = Regression line (y^ calculation)
y^ = b0 + (b1)* x
y^ = Altered Response variable (y value changed by x) = GPA
x = Explanatory variabl
1 of 24
Consider the following set of random variables:
I. Total number of points scored during a football game
II. Lifespan in hours of a halogen light bulb
III.Height in feet of the ocean's tide at a given location
IV.Number of fatalities in civilian ai
CLT(Central Limit Theorem) and Normal Probabilities - Draw a normal graph for each
problem. Include x scores and z scores and shade appropriate areas. 1. Replacement times for CD players are normally distributed with a mean of 7.1 years and a standard dev
Unit Review - TEST 3 - Statistics 1. Replacement times for CD players are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years. A) Find the probability that a randomly selected CD player will have a replacement time less tha
Random Variables and Probability Distributions
Which wager would you prefer?
You are given $100 and must pick one of two wagers, for an outcome based on flipping a fair coin:
a) You win $200 if it comes up heads and lose $50 if it comes up tails b) You wi
Descriptive Statistics
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Descriptive Stats
Descriptive statistics are used to describe data, i.e., descriptive statistics are used to summarize data in order to communicate information about the data set in a conc
Central Limit Theorem
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Question
Suppose we wanted to know the average height of all women attending UST how could we go about doing this?
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Question
Suppose we wanted to know the average height of all women
Confidence Intervals
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Estimation
Estimation is a form of statistical inference Estimation of population parameters
Estimator a formula/process for estimating a parameter from sample data Estimate value/range of v
Confidence Intervals
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Quick Review
Constructing a CI
1. 2.
3.
4.
5.
6.
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t-distribution
Students t-distribution Similar to a standard normal distribution
Symmetric, bell shaped, centered on the mean (0) H
MATH 3332 Midterm Exam Spring 2011 Directions: Please read each question carefully. Make sure to clearly mark your answers and show all necessary work. You may only consult with your professor on these problems. This test is due at the beginning of class