Purchase Solution

The Difference Between The t And z Statistic

Not what you're looking for?

Ask Custom Question

If the Z statistic (critical value) is used in lieu of the t statistic when comparing two means from independent populations using small samples, would probability of rejecting the null hypothesis increase, decrease, remain the same, or is dependent on whether the population is normal?

Purchase this Solution
Solution Summary

The solution gives detailed discussion on difference between t and z statistic.

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.

View More Free Quizzes
Related BrainMass Solutions

  • Test of hypothesis for difference between means

    t critical (calculated above)= 2.1199 Since t sample is within the acceptance region Accept null hypothesis; There is no difference between the means; (e) estimate the p-value t value (test statistic)= 1.4164

  • statistical significance and practical significance

    That is because this term (sample mean - population mean) comes in the numerator of the expression for z or t, and therefore, a small value of this difference would not increase the value of the z or the t statistic significantly.

  • Difference Between t statistic and z statistic

    171433 Difference Between t statistic and z statistic I am having trouble understanding this multiple choice question.

  • Confidence Co-Efficients

    The harmonic mean (nh) of n1 and n2 is: = 2/(1/50+1/45) = 47.37 The formula for the estimated standard error of the difference between means becomes: Smd=SQRT(2*9.74/47.37)= 0.64 Since this is a two-tailed t distribution, we should find 2.5%

  • Multiple choice questions on Test of hypothesis

    The correct test statistic for testing the hypothesis that there is no difference in the arrival times of planes from the two airlines is: A) t=1.7983 (B) Z =1.2185 (C) t= 1.5240 (D) Z=2.4397 Answer: (C) t= 1.5240

  • Independent sample t test

    225978 Testing difference A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men.

  • Hypothesis Testing for AIU Responses to Job Satisfaction Survey Variables

    Statistic used: t-test of difference between means 1.

  • Null Hypothesis for a General Social Survey

    Problem: Null hypothesis: H0:______ Alternative hypothesis: H1:______ Type of test statistic: (Z, t, Chi squared, F) Value of test statistic:______ p-value:____ Can we conclude that there is a difference between the two populations

  • t-statistic as opposed to a z-statistic for small test samples

    47959 T-Statistic and Z-Statistic and Small Test Samples Please help answer the following question. Why is a t-statistic as opposed to a z-statistic used to test small samples?

View More Related Solutions