Lab 5

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Lab 5

1. Vowel duration and aspiration eﬀects in Icelandic

This set is based on (Coretta 2017, https://goo.gl/NrfgJm). This dissertation dealt with the relation between vowel duration and aspiration in consonants. Author carried out a data collection with 5 natives speakers of Icelandic. Then he extracted the duration of vowels followed by aspirated versus non-aspirated consonants. Check out whether vowels before aspirated consonants (like in Icelandic takka ‘key’ [tʰaʰka]) are signiﬁcantly shorter than vowels followed by non-aspirated consonants (like in kagga ‘barrel’ [kʰakka]).

Use read.csv("https://goo.gl/7gIjvK") for downloading data.

1.1 Calculate 95% confidence interval for mean vowel duration (variable vowel.dur) followed by aspirated vowels (variable aspiration) for all speakers (variable speaker). Provide mean vowel duration and confident interval of speaker with minimum confident interval.

e. g. 60.45677 ± 6.793921

1.2 Calculate 95% confidence interval for mean vowel duration (variable vowel.dur) followed by non-aspirated vowels (variable aspiration) for all speakers (variable speaker). Provide mean vowel duration and confident interval of speaker with maximum confident interval.

e. g. 60.45677 ± 6.793921

1.3 Try to create this plot. I used width argument equal to 0.3.

1.4 Try to create this plot. See rugs on x axis. I used alpha argument, so plots are transparant.

1.5 Try to create this plot. Use geom_qq and argument sample. scale = "free" is used in facet_wrap() function.