Hypothesis test for single proportion.
A coin was flipped 60 times and came up heads 38 times.
a. At the 0.10 level of significance, is the coin biased toward heads? describe your decision rule and calculations.
b. find out a pvalue and interpret it.
60 38 = 0.633 Z.10 = 1.281
P (less than or equal to 2.576) = 0.9950
1  0.9950 = 0.00499
Confidence interval  proportion


99%

confidence level


0.633333333

proportion


60

n


2.576

z


0.160

halfwidth


0.794

upper confidence limit


0.473

lower confidence limit

