Quiz 1
I know I dont need to remind anyone that UMUCs academic integrity policies. We are all
adults. We know that we shortchange only ourselves if we arent honest. This quiz needs to be
completed without help from others. The work submitted must be your
Chapter 5
Discrete Probability Distributions
This chapter will provide an overview of
probability distributions which give the
probability for values of variables that are
determined by chance.
Definitions
Random Variable
Probability Distribution
A variab
Lets learn how to find the slope, the regression equation and make future
predictions.
Regression Equation
= b0 + b1
response variable or dependent variable
explanatory variable or predictor variable or independent variable
b0 y-intercept
b1 the slope
8. Assume the speed of vehicles along a stretch of I-10 has an approximately normal distribution
with a mean of 71 mph and a standard deviation of 8 mph.
a. The current speed limit is 65 mph. What is the proportion of vehicles less than or equal to the
sp
STAT 200 QUIZ 3 Solutions
Section 6380 Fall 2014
The quiz covers Chapters 7 and 8.
1. (4 points)
Distribution for the Critical
Value
Parameter
Requirements
Proportion p
(1) simple random sample
(2) conditions for the binomial distribution are
satisfied
(3
CHAPTER 12: LINEAR REGRESSION AND
CORRELATION
Exercise 1.
A vacation resort rents SCUBA equipment to certified divers. The resort charges an
up-front fee of $25 and another fee of $12.50 an hour.
What are the dependent and independent variables?
Solution
CHAPTER 11: FACTS ABOUT THE CHISQUARE DISTRIBUTION
Exercise 1.
If the number of degrees of freedom for a chi-square distribution is 25, what is the
population mean and standard deviation?
Solution
mean = 25 and standard deviation = 7.0711
Exercise 2.
If d
CHAPTER 10: HYPOTHESIS TESTING WITH
TWO SAMPLES
Exercise 1.
Indicate if the hypothesis test is for
a. independent group means, population standard deviations, and/or variances
known
b. independent group means, population standard deviations, and/or varian
CHAPTER 8: CONFIDENCE INTERVALS
Exercise 1.
The standard deviation of the weights of elephants is known to be
approximately 15 pounds. We wish to construct a 95% confidence
interval for the mean weight of newborn elephant calves. Fifty
newborn elephants a
Lets try a simple formula for finding sample size
Sample size needs to be determined to ensure that our results will be
statistically significant.
The formula is
1.96 *
E
So lets try a problem now:
We need to determine the sample size for an upcoming exp
Page 1 of 8
Homework Assignment 3
Stat 200 (Clary)
Instructions: Be sure to record the final answer next to Answer and show all your calculation
steps or assumptions under Work. You can type in your calculations, use the equation tool, or
insert images of
http:/www.intropsych.com/ch01_psychology_and_science/correlation_and_predict
ion.html
CORRELATION AND PREDICTION
The
evidence
produced
by
observational
research
is
called correlational data. Correlations
are patterns in the data. For example,
Stern found
Statistics - Normal Distribution
Based on the information below, answer the following questions:
1. Which process shows more variation? What does this mean?
We can see that the spread of the Process B is much higher than the spread of
Process A which indi
1
7318391
1. 1. Watch some TV and pay particular attention to the commercials. Post at least three examples
of statistics presented in commercials (they can come from different commercials) and say what
you think the message the advertisers were trying to
Check Yourself: The Normal Curve
"Above Average" Drivers
Using our scale, and the laws of the normal curve, I know that 14% of the population will be
"above average" drivers and that the scores in this group will range from 115 - 130.
How do I know? By de
Statistics 200 - Variables
Types of Variables
Independent Variables IV
Dependent Variables DV
Extraneous Variables - EV
Types of Variables Interaction Process
EV
EV
DV
IV
EV
Question1.FromIntroductiontoStatisticsbyLaneetal.
Fortheeyecolordatagivenbelow,construct
a)
b)
c)
d)
Apiegraph
Horizontalbargraph
Verticalbargraph
Afrequencytablewithrelativefrequencyforeacheyecolor
EyeColor
NumberofStudents
Brown
11
Blue
10
Green
4
Gray
7. For the data from the 1977 Stat. and Biom. 200 class for eye color,
construct:
a. pie graph
b. horizontal bar graph
c. vertical bar graph
d. a frequency table with the relative frequency of each eye color
9. Which of the box plots on the graph has a la
4. Why is a 99% confidence interval wider than a 95% confidence interval?
Because it doesnt show a field containing x% of the population, but simply the confidence that the
calculator has found the ACTUAL mean of the population.
12. A person claims to be
7. You flip a coin three times.
a. What is the probability of getting heads on only one of your flips?
1/8
b. What is the probability of getting heads on at least one flip?
7/8
27. A refrigerator contains 6 apples, 5 oranges, 10 bananas, 3 pears, 7 peache
18. You choose an alpha level of .01 and then analyze your data.
a. What is the probability that you will make a Type I error given that the null
hypothesis is true?
is the probability of a Type I error given that the null hypothesis is
true.
1%
b. What
Quiz 2
Each question is worth 1 point.
Dont leave anything blank. I can always find a way to give you some credit if youve made an
attempt. Be sure to post any questions you have after the answers open.
The work you turn in by 11:59 P.M. on Dec 4th must b
Week 4
Steve Finch
8. Assume the speed of vehicles along a stretch of I-10 has an approximately normal distribution with a
mean of 71 mph and a standard deviation of 8 mph.
a. The current speed limit is 65 mph. What is the proportion of vehicles less than
eResources
Chapter
Lane et al.
1
Illowsky et al.
1
Exercise
3
10
17
18
50
52
72
80
84
90
Page*
62
63
64
64
53
53
54
56
57
59
* Page numbers are approximated due to version control of the eResources, especially for
Illowsky et al.
Allthatweknowisthatthesco