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1. The following data represent the total fat content (in grams) of a cooked chicken item for a sample of
fast-food chains:
8, 10, 39, 34, 16, 27, 26, 18, 16, 23, 16
Use this data set to compute the mean, medi
90th Percentile Calculation EXAMPLES:
Systems that collect 5 samples
1. Order lead results from lowest to highest:
No 1: 0.008 mg/L
No 2: 0.008 mg/L
No 3: 0.008 mg/L
No 4: 0.011 mg/L
PB90 = 0.0155 mg/L
No 5: 0.020 mg/L
2. Multiply number of samples by 0.9
The following variable (X) represents the number of CPA's in
each of a sample of 12 small Accounting firms:
10, 12, 11, 13, 12, 10, 9, 14, 10, 7, 14, 8
Use this data to compute:
The mean, the median, the mode, the range, the variance,
the standard deviati
1. The following probability distribution represents the number of people living in a Household
(X), and the probability of occurrence (P(X). Compute the Expected Value (mean), the Variance
and the Standard Deviation for this random variable.
X
1
2
3
4
5
Bianca Williams
Statistics I
6/19/15
1. A researcher believes that the average size of farms in the U.S. has increased from the 2002
mean of 471 acres. She took a sample of 23 farms in 2011 to test her belief and found a sample
mean of 487 acres and a sam
ame: _ Class: _ Date: _
Statistics Practice 1
Multiple Choice
Identify the choice that best completes the statement or answers the question.
Find the mean, median, and mode of the data set. Round to the nearest tenth.
_
_
_
1. 2, 1, 13, 9, 10, 6, 15, 9, 1
1. A small town has 5600 residents. The residents in the town were asked whether or not they favored
building a new bridge across the river. You are given the following information on the residents'
responses, broken down by gender:
Men
Women
Total
In Fav
AP Statistics
I;" ,:
Chapter 7 Review
Name
,
1. Family size can be represented by the random variable X. Determine the average family size.
Z,
.17
(a) 2.94
.
( 3.29
' 3.00
, t f
.47
4
/, )f > ,:.ii : ): -,*')
) 3.49
(e) 3.86
0
.
The heights of married men
Section 4.5 HW- Answers
1. A professor finds that 70% of her students study for her exam the day before the exam. The
passing rate for the course is 63%. The percentage of students that study for the exam the day before
and pass the course is 52%.
First s
STA 2023 Test #2 Practice Multiple Choice
1.
Items produced by a manufacturing process are supposed to weigh 90 grams. The
manufacturing process, however, is such that there is variability in the items
produced and they do not all weigh exactly 90 grams.
Bianca Williams
Statistics I
June 10, 2015
1. The speed of automobiles on a section of I-95 is normally distributed with a population mean
of 65 miles per hour and a population standard deviation of 8 miles per hour. A random sample
of 30 cars is to be se
Bianca Williams
Statics I
June 8, 2015
The attendance at baseball games at a certain stadium is normally distributed, with a mean of
45,000 and a standard deviation of 3000. For any given game:
A) What is the probability that attendance is greater than 48
MSIS 361A
Fall 2000
Code:
Exam I
Dr. Hanizavareh
Name _
Note: To earn credit with the problem section you must show reasonable work. A correct answer without work will
not be given any credit.
Problem 1.
An insurance company has collected the following da
CHAPTER 8INTERVAL ESTIMATION
MULTIPLE CHOICE
1. The absolute value of the difference between the point estimate and the population parameter it
estimates is
a. the standard error
b. the sampling error
c. precision
d. the error of confidence
ANS: B
PTS: 1
Bones Brothers & Associates prepare individual tax returns. Over prior years, Bones Brothers
has maintained careful records regarding the time to prepare a return. The mean time to
prepare a return is 90 minutes and the standard deviation of this distribu
Based on the Nielsen ratings, the local CBS affiliate claims its 11 p.m. newscast reaches 41% of
the viewing audience in the area. In a survey of 100 viewers, 36% indicated that they watch the
late evening news on this local CBS station. What is the p-val
1. A small town has 5600 residents. The residents in the town
were asked whether or not they favored building a new bridge
across the river. You are given the following information on the
residents' responses, broken down by gender:
Men
Women
Total
In Fav
The following data set represents the lifetime of a sample of
AA batteries(measured in hours). Construct a frequency
distribution for the data. Also report the relative frequencies
for each class of your distribution.
381,
499,
220,
462,
540,
225,
264,
69
1. Distinguish between Descriptive Statistics and Inferential
Statistics.
Descriptive statistics includes statistical procedures that are
use to describe the population that is being studied using tabular,
graphical, and numerical summaries of data. The d
Notes for Economics 112, chapter 2, Descriptive Statistics I
Chapter 2 is a first look at descriptive statistics. It concentrates on a number of tabular
and graphical methods used to summarize a set of data which will help the data to revel
the things tha
In a study of the income of U.S. factory workers, a random
sample of 100 workers shows a sample mean of $35,000.
Assume that the population standard deviation is $4,500,
and that the population is normally distributed.
A) Compute the 90%, and 99% confiden
alph, a= 1-0.95=0.05
n1= 21, x1 = 185,900 s1, =2,300
n2 = 26, x2 = 184,500 s2 = 1,750
H0: u1 u2
H1: u1 is not equal to u
standard errors, se
=
test statistic, t = (x1-2x)/SE
t=(185900-184500)/608.02403=2.303
degree of freedom, df = 36.66
df=36
critical va
Bianca Williams
Statistics I
June 10, 2015
1. The speed of automobiles on a section of I-95 is normally distributed with a population mean
of 65 miles per hour and a population standard deviation of 8 miles per hour. A random sample
of 30 cars is to be se
SHOW WORK for credits
1. (a) Find a polynomial with integer coefficients that has degree 5, zeros , 1, and i , with
1 a zero of multiplicity 2.
(b) As x goes to - , does f ( x) x 5 4000 x 4 2 x 3 400 tend toward positive or
negative values? Explain.
4
3
2
Prev Sales
Nov
29,000
Kelly's Boutique
Cash Budget
Prev Purchase
Dec
Nov
28,000
Dec
16,000
17,000
7%
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Product sales revenue
30,000
32,042
34,222
36,551
Collections in the month of sale
15,000
16,021
17,111
18,276
Economics 112- Statistics
Kimberly Nelson
1. Descriptive Statistics are simply basic statistics that easily describe what is going on in a
population or even a set data. Descriptive statistics uses tables, graphs, and charts to interpret
the data. With th
1. !
!
Population Standard Deviation: 100!
Sample Mean: 450!
Sample Size: 40!
Confidence Level: 98%!
!
Standard Error- 15.8114!
Z Value- 2.33!
Interval Half Width- 36.7828!
!
Lower Limit = 413.2172!
Upper Limit = 486.7828!
!
This means that we can be 98%
Chelsie Stoner!
Assignment for Chapter 4:!
!
A) The probability of a randomly selected resident being opposed to the bridge, is 3920/5600.
The opposed total (3920) includes both men and women. (5600) Is the total group of men/
women and opposed/not oppose