Answer
Since the obtained probability is within the confidence interval, we do not reject the Null Hypothesis that 22% of married men have "strayed" at least once during marriage.
Work Step by Step
Here we have: n = 500, p = 0.22, Confidence = 95%
α = 1 - 0.95 = 0.05, α/2 = 0.025, $z_{α/2} = 1.96$
p̂ = 122/500 = 0.244
$E = 1.96 \times \sqrt \frac{ 0.244(1-0.244)}{500} = 0.0376$
Lower Bound = p̂ - E = 0.244 - 0.0376 = 0.2064
Upper Bound = p̂ + E = 0.244 + 0.0376 = 0.2816
