Purchase Solution

hypothesis test

Not what you're looking for?

Ask Custom Question

Ten automobiles were driven on a measured test track - once with standard gasoline with no additive and once with an additive supposed to increase miles per gallon (mpg). The results are given below:

mpg / car # 1 2 3 4 5 6 7 8 9 10
without additive 19 22 25 18 26 21 23 28 24 24
with additive 22 24 26 21 27 24 26 32 23 27

Test the null hypothesis that the additive has no or negative effect against the alternative hypothesis that it has a positive effect on mileage at the alpha = 0.05 level of significance.

My initial thoughts are:
Ho: mean(w/o additive) >= mean (w /additive)
Ha: mean(w/o additive) < mean (w/additive)

So this appears to be a one-tailed t-statistic with 2 population means, is this right? How would this problem work? Formulas appreciated.

Purchase this Solution
Solution Summary

It provides examples of working with hypothesis testing. The effects on mileage at the alpha with a significance level is determined. Alternative hypothesis are analyzed.

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.

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.

View More Free Quizzes
Related BrainMass Solutions

  • Left-Tailed, Two-Tailed, and Right-Tailed Testing

    If the alternative hypothesis is left directional, in other words, if we test the null hypothesis H0 : θ = θ0¬ against the alternative hypothesis H1 : θ < θ0¬¬, then this hypothesis test is called the left-tailed test.

  • Hypothesis Testing

    Claim the null hypothesis is valid C. Fail to reject the null hypothesis D. Claim the alternative hypothesis is true 6. A hypothesis test is used to test a claim.

  • The Purposes of a Hypothesis Test

    If you can, check that the assumptions necessary to do a hypothesis test are satisfied, do the test, and state your conclusion. hypothesis test What is the purpose of a hypothesis test?

  • Hypothesis test: sample of 100

    460193 Hypothesis test: sample of 100 Consider the following hypothesis test: HO: µ ≥ 80 Ha: µ < 80 A sample of 100 is used and the population standard deviation is 12.

  • Regression Hypothesis Test

    354910 Regression Hypothesis Test Methods Regression Hypothesis Test using Education vs. Experience and their relation to Salary Earnings: a. Formulate a hypothesis statement regarding your research issue.

  • Hypothesis Testing

    178637 Hypothesis Testing Please see the attached file. A hypothesis test is used to test a claim. You get 1.75 as your test statistic and 1.59 as your critical value for a right-tailed test.

  • Sample data to test the hypothesis with a two tailed test

    The expert examines sample data to test the hypothesis with a two tailed test.

  • Hypothesis Testing Using Normal Distribution

    Two-tailed test, n = 12, a = 0.05 Z Test hypothesis tests are also explain in charts in Excel attachment . Use the given claim to state a null and an alternative hypothesis. Identify which hypothesis represents the claim. Answers A.

  • Statistics and Hypothesis Testing Problems

    Null hypothesis: µ=640.6 Alternative hypothesis: µ≠640.6 This is a two tailed t test.

  • 5 Step Hypothesis Test

    388291 5 Step Hypothesis Test Test the null hypothesis that a population mean is 50 against the alternate hypothesis that the mean is not 50. The data is of ratio level.

View More Related Solutions