1. A company has two different processes that make credit cards. Suspecting that machine B has a higher variability than machine A the manager orders a test to be run. The following data was collected:

Machine A Machine B
Sample size nA= 30 nB=40
Sample Standard Deviation sA= 1.0 sB= 1.7

a. Select the correct hypothesis to test for the difference in the variances.
b. What is the critical value of the F distribution?
c. Perform the test at the .05 level of significance. What is the observed value of the F distribution?
d. What are your conclusions? Select 1 or 2.
1. B has a higher variability than machine A
2. B does not have a higher variability than machine A

2. The null hypothesis and the alternate are:
H0: The cell categories are equal
H1: The cell categories are not equal

Category Observed
A 10
B 20
C 30

Assume a significance level of 5%.
a. What is the critical value of the Chi-square?

c. What is your decision regarding H0?
1. The cell categories are equal
2. The cell categories are not equal

3. Complete the ANOVA summary table shown here.
Source of Variation Sum of Squares Degrees of freedom Mean Square F observed
Between Treatments 150.2 9
Error (Within Treatments) 200.7
Sums of Squares of Total 39

a. How many treatments are there?

b. What is the total sample size?

c. Is there a significant difference at the 5% Level of significance? Would I accept or reject the null Hypothesis. i.e. what is the critical value of the test statistic?

d. Select one of the following.
1. There is a significant difference between the treatments
2. There is no significant difference between the treatments

e. Suppose x-bar_1 = 14.9 and x-bar_2 = 18.5 and we are testing to see if there a statistical difference between treatment 1 and treatment 2 using a 5% significance level? Assume equal sample sizes for each treatment.

1. What is the confidence interval for (X-bar_1 - x-bar_2)?
2. Is there a statistical difference between treatment 1 and 2? Yes, or No?

A company has two different processes that make credit cards. Suspecting that machine B has a higher variability than machine A the manager orders a test to be run. The following data was collected:

The five numbers summary below shows the grade distribution of two SAT 200 quizzes
minimum Q1 Median Q3 Maximum
Quiz 1.............12...............50.............60...................95...................100
Quiz 2..............20...............35............50

4.6 On Friday night, the owner of Chez Pierre in downtown Chicago noted the amount spent for
dinner for 28 four-person tables.
(a) Use Excel or MegaStat to find the mean, median, and mode.
(b) Do these measures of central tendency agree? Explain.
(c) Are the data symmetric or skewed? If skewed, which direction?
(d) Not

To test the effectiveness of a new studying strategy, a teacher randomly divides a sample of 8 students into tow groups, with n = 4 in each group. The students in group one receive training in the new studying strategy. Then all students are given 30 minutes to study a chapter before taking a quiz. The quiz scores for the t

Individual Assignment: Exercises From the E-Text
? Resource: Applied Statistics in Business and Economics
? Prepare answers to the following exercises from Applied Statistics in Business and Economics:
? Chapter 4: Exercises 4.4 Page 125; with modifications. The following problem is similar to exercise 4

Below you are given 25 numbers which represent the Quiz #1 scores of 25 students. Use MegaStat and provide a descriptive data analysis of the data set. Please note that you will need to enter the data set into MegaStat. Include at least the following, with specific references to the data, taken from the MegaStat output.
82

Week 3 Stats Quiz
1. The table below shows the results of a survey in which 146 families were asked if they own a computer and if they will be taking summer vacation this year...
2. Outside a home, there is an 8-key keypad with letters A, B, C, D, E, F, G and H that can be used to open the garage if the correct eight-letter co

Add a class FillInQuestion to the question hierarchy of How To 10.1. An object of this class is constructed with a string that contains the answer, surrounded by _ _, for example, "The inventor of Java was _James Gosling_". The question should be displayed as
The inventor of Java was _____
Here is a sample program run:

The following is a sample
Quiz #1 Final
7 34
4 25
2.5 24
8 34
3 20
7.5 34
7.25 42
7 25
5 33
Conduct a hypothesis test to determine if there is a linear relationship (positive correlation) between the two scores or not. Remember to clearly state the null and alternate hypothesis and assume α = .05.

The table below contains ten questions. Please read through the set of possible answers and determine the best answer to each question. In the yellow answer column of the quiz, type the letter (A, B, C, D, or E) that corresponds to the answer you've chosen. Each question has only one answer. Place only one letter into each ans

I need help with some practice problems that were given to us, to help prepare for a quiz next week. Please provide detailed steps as to how you came by your answer (include any notes, calculations, or anything that may be pertinent to the solution).
As always, your help would be greatly appreciated!
Thanks,
E