T test for Significance of correlation & Scatter plot
Not what you're looking for?
Instructions for Exercises 12.2 and 12.3:
(a) Make an Excel scatter plot. What does it suggest about the population correlation between X and Y?
(b) Make an Excel worksheet to calculate SSxx , SSyy , and SSxy . Use these sums to calculate the sample correlation coefficient. Check your work by using Excel's function =CORREL(array1,array2).
(c) Use Appendix D to find t.05 for a two-tailed test for zero correlation.
(d) Calculate the t test statistic. Can you reject ρ = 0? (e) Use Excel's function =TDIST(t,deg_freedom,tails) to calculate the two-tail p-value.
Chapter 12 Bivariate Regression 497
12.2 Part-Time Weekly Earnings ($) by College Students WeekPay
Hours Worked (X) Weekly Pay (Y)
10 93
15 171
20 204
20 156
35 261
12.3 Data Set Telephone Hold Time (min.) for Concert Tickets CallWait
Operators (X) Wait Time (Y)
4 385
5 335
6 383
7 344
8 288
Purchase this Solution
Solution Summary
The solution provides step by step method for the calculation of sum of squares of x and y, sample correlation and test statistic for significance of correlation coefficient. Formula for the calculation and Interpretations of the results are also included.
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.