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# Confidence interval for mean and Box Plot

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##### Solution Summary

This solution includes a step by step method for computing the given confidence interval and box plot.

##### Solution Preview

The box Plot suggests that average time to drill under Wet Drilling is less than that of Dry drilling.
b. Hypothesis testing
H0: There is no significant difference in the mean time to drill under both methods.
H1: There is significant difference in the mean time to drill under both methods.
Test Statistic used is independent sample t test. The test statistic used is
where
Significance level = 0.01
Rejection criteria: Reject the null hypothesis, if the calculated value of t is greater than the critical value of t at 0.01 significance level.

Details
t-Test: Two-Sample Assuming Equal Variances

##### 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.