# What does the confidence interval suggest about the

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constructed using independent simple random samples. What does the confidence interval suggest about the difference in length between male and female test completion times? −0.2 minutes< μ 1 μ 2 <2.7 minutes - There is no difference in length of time for statistics test completion between male and female students A test of abstract reasoning is given to a random sample of students before and after they completed a formal logic course. The results are given below. Construct a 95% confidence interval for the mean difference between the before and after scores. Before 74 83 75 88 84 63 93 84 91 77 After 73 77 70 77 74 67 95 83 84 75 - 0.2 < μ d < 7.2 Module 8 ______________ measures the strength of the relationship between two variables. - Pearsons Correlation Coefficient ______________ predicts the future based upon what has happened in the past. - Linear Regression Based on the scatterplot, select the most likely value of the linear correlation coefficient r . - -1
A(n) ________ is a point lying far away from other data points on a scatterplot. - Outlier Based on the scatterplot, select the most likely value of the linear correlation coefficient r . - 1 Given the linear correlation coefficient r and the sample size n , determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05. r =0.543, n =25 - Critical value: r = +/- 0.396, significant linear correlation (n-2 utilize chart) Given the linear correlation coefficient r and the sample size n , determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05. r =0.767, n =25 - Critical value: r = +/- 0.396, significant linear correlation Given the linear correlation coefficient r and the sample size n , determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05. r =−0.816, n =5 - Critical values: r = ±0.878, no significant linear correlation (Values are almost the same) Find the value of the linear correlation coefficient r . The paired data below consist of the temperatures on randomly chosen days and the amount a certain kind of plant grew (in millimeters). - 0.196 (utilize Pearson’s correlation calculator) Suppose you will perform a test to determine whether there is sufficient evidence to support a claim of a linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level α . n =12, α =0.01. - R = +/- 0.708 (a = confidence level, n-2 utilize chart) A 0.05 significance level is being used to test a correlation between two variables. If the linear correlation coefficient r is found to be 0.591 and the critical values are r = ±0.878, what can you conclude? - There is not sufficient evidence to support the claim of a linear correlation between the two variables.
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