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BSTA midterm Exam Study Guide Solutions

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BSTA midterm Exam Study Guide Solutions t test use - ANSWER-compare 2 means ANOVA and covariance use - ANSWER-compare more than 2 means Simple and linear regression use - ANSWER-when outcome is continuous a B s u x-bar o s n - ANSWER-a-alpha type 1 error B-beta type 2 error Copyright ...

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  • November 3, 2024
  • 41
  • 2024/2025
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KaylinHoffman
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BSTA midterm Exam Study Guide

Solutions


t test use - ANSWER✔✔-compare 2 means


ANOVA and covariance use - ANSWER✔✔-compare more than 2 means


Simple and linear regression use - ANSWER✔✔-when outcome is continuous


a


B


s


u


x-bar


o


s


n - ANSWER✔✔-a-alpha type 1 error


B-beta type 2 error

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s-delta difference


u- Mu population mean


x-bar- x-bar sample mean


o-sigma sample s.d.


s- s sample s.d.


n- n sample size


variable - ANSWER✔✔-something that is measured, controlled, or manipulated; measurable attributes


4 categories of variables - ANSWER✔✔-nominal


ordinal


interval


ratio


nominal - ANSWER✔✔-qualitative; ex. gender, race, color, blood type, city


ordinal - ANSWER✔✔-rank; ex. dislike, like, indifferent


stage of cancer, performance status, class of heart failure




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interval - ANSWER✔✔-rank measured items and quantify and compare sizes of differences between

them


ex. temp, temp of 40 degrees is higher than 30 degrees


increase from 20 degrees to 40 degrees is twice as much as increase from 30 degrees to 40 degrees


-equal distance b/w points but no real 0 point


-IQ


Ratio - ANSWER✔✔-all properties of interval, but has identifiable absolute zero point, plus allows for

statements like x is 2 times more than y


ex. time or space


tempe, F or C, is not ratio. a temp of zero does not mean no tempo


-temp of 100C is not twice as hot as 50C b/c C is not a ratio variable


ex. age, height, weight, enzyme activity are ratio


-most stat data does not distinguish b.w. ratio and interval


interval and ratio - ANSWER✔✔-quantitative


nominal and ordinal - ANSWER✔✔-qualitative


item


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frequ distribution


median and percentiles


add & subtract


mean, s.d., se


ratio or CV




-nominal, ordinal, interval, ratio - ANSWER✔✔-item nom ord inter ratio


frequ yes yes yes yes


med/per no yes yes yes


mean/sd/se no no yes yes


ratio/CV no no no yes


median - ANSWER✔✔-odd= n+1/2; even n/2+1


weakness: determined by middle values


strength: less sensitive to actual numerical values of remaining data points; insensitive to outliers


Mode - ANSWER✔✔-weakness= not useful measure of central location if there is a large number of

possible values, each of which occur infrequently

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