Test of Hypothesis
Not what you're looking for?
Use the following to answer questions 1-6.:
A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is calculated. The results are presented below.
Process A Process B
Mean 0.002mm 0.0026mm
Standard Deviation 0.0001mm 0.00012mm
Sample Size 12 14
The researcher is interested in determining whether there is evidence that the two processes yield different average errors.
1. What is the null hypothesis?
A)
B)
C)
D)
2. What is the alternate hypothesis?
A)
B)
C)
D)
3. What is the degrees of freedom?
A) 10
B) 13
C) 26
D) 24
4. What is the critical t value at the 1% level of significance?
A) +2.779
B) -2.492
C) 1.711
D) 2.797
5. Assume calculated t to be +2.70, at the 0.01 level of significance what would be the decision?
A) Reject the null hypothesis and conclude the means are different.
B) Reject the null hypothesis and conclude the means are the same.
C) Fail to reject the null hypothesis and conclude the means are the same.
D) Fail to reject the null hypothesis and conclude the means are different.
6. This example is what type of test?
A) One sample test of means.
B) Two sample test of means.
C) Paired t-test.
D) Test of proportions.
Purchase this Solution
Solution Summary
Answers questions on test of hypothesis.
Solution Preview
The answers are in attached file:
Use the following to answer questions 1-6.:
A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is calculated. The results are presented below.
Process A Process B
Mean 0.002mm 0.0026mm
Standard ...
Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.