Purchase Solution

Hypothesis Testing:Comparison of Mean

Not what you're looking for?

Ask Custom Question

To test the hypothesis that students who finish an exam first get better grades, the professor kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of 24.9.
Is this a signficiant difference at alpha = .05?

a) state the hypothesis for a right tailed test
b) obtain a test statistic and p-value assuming equal variances
interpret these results

c) is the difference in mean scores large enough to be important
d) is it reasonable to assume equal variances?
e) carry out a formal test for equal variances at alpha = .05

Use Megastat and show all steps clearly.

Purchase this Solution
Solution Summary

The solution provides step by step method for the calculation of testing of hypothesis of mean. 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.

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

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.

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

  • Null and Alternative Hypotheses

    The alternative hypothesis describes the expected conclusion of the statistical test. You only accept the alternative hypothesis if there is strong enough evidence for it.

  • Hypothesis Testing of Mean: P-value Method

    Details t Test for Hypothesis of the Mean Data Null Hypothesis = 11 Level of Significance 0.05 Sample Size 14 Sample Mean 9 Sample Standard Deviation 4 Intermediate Calculations Standard Error of the Mean 1.069044968

  • Hypothesis Test for Means

    This is done using the following formula: z = (mean of 1st group - mean of 2nd group) / (standard error).

  • Hypothesis test: sample of 100

    Z Test of Hypothesis for the Mean Data Null Hypothesis m= 80 Level of Significance 0.01 Population Standard Deviation 12 Sample Size 100 Sample Mean 77 Intermediate Calculations Standard Error of the Mean 1.2000

  • Hypothesis Testing of Mean: Baseball 2008 Data

    Details t Test for Hypothesis of the Mean Data Null Hypothesis = 2 Level of Significance 0.05 Sample Size 30 Sample Mean 2.62 Sample Standard Deviation 0.750841866 Intermediate Calculations Standard Error of the Mean

  • Verbal and Numerical Hypothesis

    The alternative hypothesis is that the township's population mean is less than the mean of the overall population. For a numeric (or symbolic) hypothesis statement, we can define to be the mean of the township.

  • Testing Hypothesis

    Details Z Test of Hypothesis for the Mean Data Null Hypothesis = 40 Level of Significance 0.05 Population Standard Deviation 1.6 Sample Size 100 Sample Mean 40.6 Intermediate Calculations Standard Error of the Mean

  • Test of hypothesis

    ) Reject Null Hypothesis, else Accept Null Hypothesis 3) Calculation of sample statistics Hypothesized Mean=M = 150 Standard deviation =s= 10 Sample size=n= 200 sx=standard error of mean=s/square root of n= 0.7071

  • Null hypothesis and the alternative hypothesis.

    The dean of a major university claims that the mean time required to earn a master's degree is 3.4 years.

  • Conducting a hypothesis test for student math scores

    Details Z Test of Hypothesis for the Mean Data Null Hypothesis = 90 Level of Significance 0.05 Population Standard Deviation 8 Sample Size 30 Sample Mean 94 Intermediate Calculations Standard Error of the Mean 1.460593487

View More Related Solutions