Descriptive Statistics
Let us talk about faculty evaluation. Oh, let us be serious for a change .
My colleagues and good friends taught STAT 200 in 1684 at UMUC - Europe. Both had ten
students in their respective classes, sections 6980 and 6981. Below ple
WEEK 3
LANE: CHAPTER 5
5) 1/(29) x (9/6); (29) = 512; (9x8x7)/(3x2x1) = 84; 84/512 = 0.164
7a) The coin has only 2 sides so the probability of heads = = 0.5
7b) The probability of heads on at least one flip is 1 (0.53) = 7/8 = 0.875
9a) (5/20) x (4/19) +
WEEK 7
LANE
2a) Y = 2X+9; Y = 2(6)+9 = 21
2b) Y = 2x+9; 14=2x+9 = 2.5
6a) Hit Stat button on calculator, put x numbers for L1 and y numbers for L2. Then
went to Calc hit (LinReg) which gave me r. r=.8942, which means there is a strong
positive correlation
WEEK 5
LANE: CHAPTER 10:
4) The definition of a confidence interval is that it contains the true population
mean. If there is a 90% confidence interval that means I am 90% confident that the
true population mean is in the interval. If I am less certain th
WEEK 2:
CHAPTER 2:
7a.
NUMBER OF STUDENTS
4%
15%
BROWN
BLUE
GREEN
GRAY
42%
38%
7b.
NUMBER OF STUDENTS
GRAY
1
GREEN
4
NUMBER OF STUDENTS
BLUE
10
BROWN
11
0
2
4
6
8
10
12
7c.
NUMBER OF STUDENTS
12
11
10
10
8
NUMBER OF STUDENTS
6
4
4
2
1
0
BROWN
7d.
EYE COLO
WEEK 6
LANE:
18a) The probability of type I error is alpha given that the null hypothesis is
true, so its 0.01.
18b) When null hypothesis is false, it is impossible to make a type I error, so
the probability is 0.
20) True, because if the data analysis re
1. A fair coin is ipped 9 times. What is the probability of getting exactly 6 heads?
n= 9 x=6 prob=0.5
p(6)=[ 9!/(6!*(9-6)!)](0.5)^6* (1-0.5)^(9-6)
p(6)=84 (0.0156)(0.125)
p(6)= 0.1638
2.You ip a coin three times.
(a) What is the probability of getting he
University of Maryland University College
Stat 200 (Whealon)
Quiz 2 80 points
Directions: Read and sign the academic honesty certification statement below before taking the quiz. Please
show your work for maximum credit. 80 points are possible on this qui
University of Maryland University College
Stat 2000 (Whealon)
Quiz 1
Directions: Read and sign the academic honesty certification statement below before taking the quiz. Please
show your work for maximum credit. 40 points are possible on this quiz.
The te
University of Maryland University College
Stat 200 (Whealon)
Quiz 3 80 pts
Directions: Read & sign the academic honesty certification statement below before taking the quiz.
The test and work is due as specified in the Course Schedule. Late submissions ar
WEEK 4
LANE:
8a) (71-65)/8 = 0.75 ~ look on z-table : 0.2266
8b) (71-50)/8 = 2.625 ~ look on z-table : .0044
8c) The new speed limit would be 77.7 ~ 78 MPH
8d) The speeds are not symmetrically placed around the central value, which means
they may not have
Week 1 Homework
LANE:
3) No, you do not know which definition the percentile is based on, so you would need more
information to know how it was calculated.
10) a) x = 1+2+4+16 = 23
b) x2 = 12+22+42+162= 277
c) (x)2 = 1+2+4+16 = 232 = 529
17) The independe
Lora Anderson
1) A man pays $160 a year for a life insurance policy with
a coverage of $145,000 payable to his survivor upon his
death. The probability that he will live through the year is
0.9992.
a. (0.25 points) Supply the probability table for this pr
Lane
3. If you are told only that you scored in the 80th percentile, do you know from that description
exactly how it was calculated? Explain.
I can assume it was calculated using percentile rank formula is: R = P / 100 (N + 1). R represents
the rank orde
Illowsky
Chap 3
#86 Roll two fair dice. Each die has six faces.
a. List the sample space. S=cfw_1,1,2,2,3,3,4,4,5,5,6,6
b. Let A be the event that either a three or four is rolled first, followed by an even number. Find
P(A). P(A) = 5/6
c. Let B be the ev
Lane chap 2
#7 For the date from the 197 Stat. and Biom. 200 class for eye color, construct:
a.
b.
c.
d.
Pie graph
Horizontal bar graph
Vertical bar graph
A frequency table with the relative frequency of each eye color
Eye Color
Brown
Blue
Green
Gray
# of
Lane chap 10
4. Why is a 99% confidence interval wider than a 95% confidence interval?
A confidence interval contains the true population mean. If you have a 95% confidence
intervals then you are 95% sure that the true population mean is in the interval.
Lane Chap 11 & 12
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?
1% probability
b. What is the probability that you will make a Type I e
Lane chap 14
2. The formula for a regression equation is Y = 2X + 9.
a. What would be the predicted score for a person scoring 6 on X?
Y = 2(6) + 9 = 21
b. If someones predicted score was 14, what was this persons score on X?
Y= 2X + 9 = 14
Subtract 9 fro
Post World War II there was several changes that affected everyone, mostly women and African
Americans. The feminist movement and the civil rights movements both contributed to these
changes. There were a lot of similarities, and differences. The women's
Lane Chap 7
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 equ
Lane chap 15
10. If an experiment is conducted with 5 conditions and 6 subjects in each condition, what are
dfn and dfe?
# of groups = 5
DF for groups= 5-1=4
n= total subjects=5*6=30
dfn=30-1= 29
dfe=29-4= 25
17. The following data are from a hypothetical
STAT 200: Introduction to Statistics
Final Examination, Fall 2016 OL1/US1
Page 1 of 8
STAT 200
OL1/US1 Sections
Final Exam
Fall 2016
The final exam will be posted at 12:01 am on October 14, and it is
due at 11:59 pm on October 16, 2016. Eastern Time is ou