Name_
STA 119
Turn in Homework 2: Due Thursday October 1, 2015
Class Number_
1. Suppose that it is known that a certain disease occurs in 1.2% of the population. Suppose also that we have a
certain medical test to determine if person has this disease. The

HW7E:
Name _
Class Number _
Suppose that our company performs DNA analysis for a law enforcement agency. We currently have 1 machine that
is essential to performing the analysis. When an analysis is performed, the machine is in use for half of the day.
Th

Homework 20 A
Name_
Class Number_
1. Company A claims that their tires outlast the tires of Company B by more than 10,000 miles. Data has been
collected and summarized below: Test the claim at the .05 level assuming normality and equal variances.
Company

HW1A:
Name _
Class Number _
1. A survey asked 1200 voters who they would vote for in the next election. Of those surveyed, 432 said that they
would vote for Candidate A. Determine the proportion that will vote for Candidate A.
432/1200 = .3600
2. Of the 4

1
Stats 119
Assignment 1
Class Number_
Name_
1. Determine the standard deviation of the data set to 4 decimal places: ( x
101.57 1.83 1.14 2.746
3.21 8.33 9.11 88.2 49
29.4596 )
Answer
2. A new program was developed to hopefully reduce the risk of injury

HW12A:
Name _
Class Number _
1. Suppose that we have a normally distributed process that has a mean of 50,
deviation of .2,
.2
50
, and a process standard
. Sigma is a measure of our inability to make everything exactly the same. The larger sigma
is the

t-Table
This is a Right Sided Chart
The chart gives the axis number with the given
probability to the right.
df
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
60
120
z
t.10
1.886
1.638
1.533
1.476
1.440
1.415
1.397
1.383
1.

Stat 119
Turn in HW 6
Class Number _
Name_
1. Perform a .05 level test: H 0 : 1 2 H a : 1 2
n1 9 n2 4 s1 2.45 s2 6.83
2. In the general population the racial makeup of five groups is
p1 .35, p2 .20, p3 .20, p4 .10, p5 .15
A company employs 2000 workers. T

Class Number_
Turn in Assignment #3
1. Determine
Name_
P (1.26 Z 1.88)
Answer: _
2. Determine
P(2.06 Z )
(Must draw graph)
Answer: _
3. Determine
P ( Z .65)
(Must draw graph)
Answer: _
4. Determine the value of k so that
P(k Z ) .0125
(Must draw graph)
An

Stat 119
Turn in HW 5
Class Number _
Name_
1. . Data is collected to compare two different types of batteries. We measure the time to failure of 10
batteries of each type. Battery A: x A 8.65 . Battery B: xB 11.23 . Assume equal variances and that we
calc