An analyst for a firm claims that their market-share has increased. In the past, about 35% of households used their product. To test the claim, they set up the following:
H0: p <= 0.35
H1: p > 0.35
To carry out the test at a significance level of 10%, the analyst took a random sample of households (sample size = 80), and found the sample proportion of households that used their product, and it was 25 out of 80. Compute the appropriate Z-stat.