add lect08 and lect09 prereading

lect08-continuous/README.md

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+# Lecture 8 Pre-reading/listening:
+
+* [Section 18.3: Least Squares Estimates](http://rafalab.dfci.harvard.edu/dsbook/linear-models.html#lse) in "Introduction to Data Science" by Rafael Irizarry
+* [Collinearity & Confounding](http://genomicsclass.github.io/book/pages/collinearity.html) section from Chapter 5 of "Biomedical Data Science" by Rafael Irizarry
+* [This 2.5 minute audio clip introducing limma](https://www.youtube.com/embed/ZRet1oeGiUU?&end=150) from [Kasper Hansen's course "Bioconductor for Genomic Data Science"](https://kasperdanielhansen.github.io/genbioconductor/):
+
+<p align="center">
+<a href="https://www.youtube.com/embed/ZRet1oeGiUU?&end=150"><img src="img/limmavideoscreenshot.png" alt="limma video screenshot"></a>
+</p>
+
+

lect09-multipleTesting/README.md

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+# Lecture 9 Pre-reading/watching:
+
+* [This 14 minute screencast demonstrating design matrix construction and limma in action](https://www.youtube.com/embed/ZRet1oeGiUU?&start=150) (a continuation from last lecture's material) from Kasper Hansen's course ["Bioconductor for Genomic Data Science"](https://kasperdanielhansen.github.io/genbioconductor/):
+
+<p align="center">
+<a href="https://www.youtube.com/embed/ZRet1oeGiUU?&start=150"><img src="img/limmavideoscreenshot.png" alt="limma video screenshot"></a>
+</p>
+
+* Sections 7-9 in Chapter 6 (Hypothesis Testing) in ["Modern Statistics for Modern Biology"](http://web.stanford.edu/class/bios221/book/) by Susan Holmes and Wolfgang Huber:
+
+  * [6.7: Multiple testing](https://www.huber.embl.de/msmb/06-chap.html#multiple-testing)
+  * [6.8: The family wise error rate](https://www.huber.embl.de/msmb/06-chap.html#sec-testing-FWER)
+  * [6.9: The false discovery rate](https://www.huber.embl.de/msmb/06-chap.html#the-false-discovery-rate)
+