Purchase Solution

T test for assembly times

Not what you're looking for?

Ask Custom Question

A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly processes. Process 1 is the standard process used for several years, and Process 2 is an updated process hoped to bring a decrease in assembly time. Assembly times can vary considerably from worker to worker, and the company decides to eliminate this effect by selecting a random sample of 8 workers and timing each worker on each assembly process. Half of the workers are chosen at random to use Process 1 first, and the rest use Process 2 first. For each worker and each process, the assembly time (in minutes) is recorded, as shown in Table 1.

Table 1

Based on these data, can the company conclude, at the level of significance, that the mean assembly time for Process 1 exceeds that of Process 2? Answer this question by performing a hypothesis test regarding , the population mean difference in assembly times for the two processes. Assume that this population of differences (Process 1 minus Process 2) is normally distributed.

Perform a one-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.)

See attached file for full problem description.

Attachments
Purchase this Solution
Solution Summary

Step by step method for testing the hypothesis under 5 step approach is discussed here. Excel template for each problem is also included. This template can be used to obtain the answers of similar problems.

Purchase this Solution
Free BrainMass Quizzes
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.

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.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

View More Free Quizzes
Related BrainMass Solutions

  • Test the means of two populations

    Using the .10 level of significance, can we conclude that the assembly time using the new method is faster? Solution. Denote by the mean assembly time. So, H0: =42.3 H1: <42.3. Use t-test.

  • New Methods and Mean Assembly Times

    This solution determines if the assembly time for the new method is faster by conducting a statistical analysis on the null and alternative hypothesis by calculating the test statistic.

  • independent sample t test

    246250 Independent sample t test Two new york designs are under consideration for possible adoption in an assembly plant. A time study is conducted with 10 workers using design 1, and 12 workers using design 2.

  • Using Statistical Techniques to teach computers to workers

    Choose a = 0.05, and run a t- test for difference in means to see if the population means differ significantly.

  • Evidence of a difference between the variances in assembly

    442637 Using a 0.05 level of significance, is there evidence of a difference between the variances in assembly times (in seconds) of employees trained in a computer-assisted, individual-based program... 10.49 The director of training for a company that

  • Hypothesis test for the difference of population means: Paired comparisonss

    136407 Hypothesis test for the difference of population means: Paired comparisons Hypothesis test for the difference of population means: Paired comparisons A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly

  • Students t test for assembly time of golf cart

    Using the .10 level of significance, can we conclude that the assembly time using the new method is faster? Please see the attached file. Students t test for the assembly time of golf cart. The students t test compare two methods.

  • Significance Level for Accompanying Data

    247117 Significance Level for Accompanying Data The accompanying data are the times in seconds that it took a sample of employees to assemble a component at Ental Industries manufacturing facility. Assembly times are normally distributed.

  • Reaction times of assembly line workers: Kruskal-Wallis Test

    88563 Reaction times of assembly line workers: Kruskal-Wallis Test An industrial psychologist wants to test whether the reaction times of assembly line workers are equivalent under three different learning methods.

View More Related Solutions