{ Maa/1:41 lY
Leah/we Moira 4/9!
Apri\2008summ ex/W16th Yofe move 57» .
934(5th5415183 were Hm? My oimcvma thmwovamt WaflmM/C
2W7,-
v Bureau 0% L01 bevmmhc;
uhemwmcm sfger/erd Hrwovtgh a Immwc
W x 1400?; : MWCIMPYDleCl/lf raw
\abov Foch
*a/UCI ne YMHFJc/I
Question:
1). The figure below shows a histogram for the heights of a representative sample of men. The
shaded area represents the percentage of men whose heights were between _ and
_. Fill in the blanks.
Answer:
1). 66, 72
Question:
2). The age distribut
Question:
1.
A box of tickets has an average of 100, and an SD of 20. Four hundred draws will be
made at random with replacement from this box.
(a) Estimate the chance that the average of the draws will be in the range 80 to 120.
(b) Estimate the chance t
Question:
3.
Two investigators are testing the same null hypothesis about box X, that its average
equals 50. They agree on the alternative hypothesis, that the average differs from 50.
They also agree to use a two-tailed z-test. The first investigator tak
Question:
1.
A survey organization draws a simple random sample of 1,000 registered
voters in a certain town. In the sample, 32% approve of the Mayor. The
organization estimates that 32% of all 50,000 registered voters in the town
approve of the Mayor. Ho
Question:
1.
You are drawing 100 times at random with replacement from a box. Fill in the blanks,
using the options below.
(a)
To test the null hypothesis that the average of the box is 2, you would use_.
(b)
To test the null hypothesis that the box is [1
Question:
1.
True or false and explain;
(a)
The P-value of a test equals its observed significance level.
(b)
The alternative hypothesis is another way of explaining the results; it says the
difference is due to chance.
Answer:
1.
(a)
(b)
True, its the de
Question:
1. A study of IQs of husbands and wives obtained the following results:
for husbands: average IQ 100, SD- 15
for wives: average IQ 100, SD- 15
r=.6
One of the following is a scatter diagram for the data. Which one? Say briefly why you reject the
Question:
1. The figure below shows the probability histogram for the total number of spots when a die is
rolled eight times. The shaded area represents the chance that the total will be between _ and
_ (inclusive).
Answer:
1. 20, 25
Question:
2. Four hun
Question:
4. A poker hand is dealt. Find the chance that the first four cards are aces and the fifth is a king.
Answer:
4. .0000003%
(4/52 * 3/51 * 2/50 * 1/49 * 4/48) = .0000003
Question:
6. A deck of cards is shuffled and the top two cards are placed fa
Question:
1. The Federal Bureau of Investigation reports state-level and national data on crimes.
(a) An investigator compares the incidence of crime in Minnesota and in Michigan. In
2001, there were 3,584 crimes in Minnesota, compared to 4,082 in Michiga
Question:
1. When studying one variable, you can use a graph called a _. When studying the
relationship between two variables, you can use a graph called a _.
Answer:
1. histogram, scatterplot
Question:
2. True or false, and explain briefly:
(a) if the co
Question:
3. From the mid-1960's to the early 1990's, there was a slow but steady decline in SAT scores.
For example, take the Verbal SAT. The average in 1967 was about 543; by 1994, the average was
down to about 499. However, the standard deviation staye
Question:
3.
The Gallup poll asks respondents how they would rate the honesty and ethical standards
of people in different fields - very high, high, average, low, or very low. The percentage
who rated clergy "very high or high" dropped from 60% in 2000 to
Question:
1. A box contains 10,000 tickets: 4,000 [0], 6,000 [1]. And 10,000 draws will be made at
random with replacement from this box. Which of the following best describes the
situation, and why?
i.
The number of 1s will be 6,000 exactly.
ii.
The numb
4.1
1.
My prior is beta (30, 50), so the posterior is beta (35, 75)
a) Mean of the posterior = 35/ (35+75) = 0.318
The mode of the posterior = (35-1)/(35+75-2) = 0.315
b) > qbeta(c(0.025,0.975),35,75)
[1] 0.2348755 0.4077506
The 95% posterior interval is
STAT:1020 HW #3 Fall 2016 Name _Sec _
Directions: Work out all of the assigned problems. Use this page and add
additional pages as needed.
Chapter 8 pg 134-139 review probs/#1, #3, #5, (GPA
STAT:1020 HW #1 Fall 16 Name _Sec _
Directions: Work out all of the assigned problems. Use this page and add
additional pages as needed.
Chapter 3 - page 50 -55/#2 (use abt. page, use a
Competency Exam 3 Name: Amery
22$:025/7Pz025 Spring 2014 ID: f a! v 7
Professor Ankenmann Discussion Section:
Form B
Directions
The point value of each question is indicated at the end of the question. There are 20 points altogether.
Show all of your work