Lower Middle Upper Total Casio 60 180 240 480 Texas Instrument 40 300 480 820 Hewlett-packard 100 120 80 300 Tota 200 600 800 1600 The contingency table above is from a survey of 1600 calculator users, asking what class bracket they belong to (lower, middle, or upper) and what brand calculator they use (Casio, TI, or HP). a) Fill out the conditonal distribution table below for the probability someone uses any of these three calculators, given their class bracket. (write all probabilities as decimals rounded to two places) Lower Middle Upper Casio Texas Instrument Hewlett-packard Total 1 1 1 b) Does there appear to be a correlation between probability of using a Casio as class bracket increases from lower to upper? Fill in the blank with either "positive," "negative," or "neither." There appears to be a correlation to using a Casio as class bracket gets increasingly higher