Purchase Solution

One sample Z test

Not what you're looking for?

Ask Custom Question

The mean employee turn over at Ms. Jameelah's employment of 280 employees hired for the different new position each year is 20 with standard deviation of 4.6. It is now assumed that because of the down turn in the economy, the turn over has decreased to less than 20 in average. A random sample of 90 employees from 280 total showed turnover of 12 employees in average so far. Should we reject the null hypothesis that the population mean is 20? Use significance level of 0.08 to construct the 5 step hypothesis test.

Need help writing the hypothesis formula.

Purchase this Solution
Solution Summary

The solution provides step by step method for the calculation of one sample z test . Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

Solution Preview

Please see the attachments for explanation.

Answer
The null hypothesis tested is
H0: The mean employee turn over=20
H1: The mean employee turn over<20
The test statistic used is
Significance level  ...

Purchase this Solution
Free BrainMass Quizzes
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.

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.

View More Free Quizzes
Related BrainMass Solutions

  • Statistics - One Sample t-test

    Use one of the following techniques: regression line and equation; correlation one-sample t-test one-sample t confidence interval matched-pairs t-test two-sample t-test two-sample t confidence interval F-test for variances ANOVA one-sample z

  • When to use a t-test and when to use a z-test

    101937 When to use a t-test and when to use a z-test When to use a t-test and when to use a z-test. How to choose between a t-test and a z-test, a one-sample test and a two-sample test, and a one-sided and a two-sided test.

  • Significance Tests and Confidence Intervals

    z test for proportions one-sample z confidence interval for proportions two-sample z test for proportions two-sample z confidence interval for proportions chi-square Please complete at least three significance tests and a confidence interval.

  • Z-Test vs. T-Test

    test for dependent samples c) Rationale for both selections so I might be able to understand better Both the z-test and the t-test are used to compare means (means of two samples or the mean of one sample vs. a given number).

  • Intro to Stats: review question

    For this problem, we will use a one-sided, one-sample z-test. It is a z-test because it involves proportions (as opposed to means, for which we would use a z-test or a t-test, depending on the situation).

  • Hypothesis testing

    Use 95% confidence with a one-tail test.

  • The difference between t-tests and z-tests

    Thus, the t-test allows us to deal with a more wide variety of situations than the z-test. This solution explains the difference in assumptions of a one-sample t-test and a z-test.

  • Test a hypothesis : key informaiton

    The sample mean is 2.59 and the sample standard deviation is 0.66. Conduct the following test of hypothesis using the .08 significance level. H0: u1<=u2 H1: u1 > u2 a. Is this a one-tailed or a two-tailed test? Solution.

  • Analysis of Variance - ANOVA Problem

    Answer: When you have one sample or two samples, we can use the t-test (for sample less than 30) and z-test (for large samples). The notion here is to compare two population parameters.

  • Hypothesis test: sample of 100

    This solution provides a step by step method for computing test statistic for one sample t test is given in the answer. The sample size and the population standard deviation and p-value is calculated for various sample means.

View More Related Solutions