iid Let x1, X2, . , Xn N(4, o2). Find the necessary sample size n and the value y so that Xn

Extracted text: iid Let x1, X2, . , Xn N(4, o2). Find the necessary sample size n and the value y so that Xn < y="" is="" the="" rejection="" region="" for="" testing="" ho="" :="" u="" 2="" 20="" versus="" h1="" :="" µ="">< 20,="" with="" the="" probability="" of="" type="" i="" error="" being="" 4.8%="" and="" the="" power="" at="" u="19.77" being="" 0.95.="" (you="" may="" use="" o="0.3)" the="" following`answers"="" have="" been="" proposed.="" (a)="" n="18.66" z="" 19,="" and="" y="19.8842." (b)="" n="31.62" -="" 32,="" and="" y="19.8842." (c)="" n="18.66" z="" 19,="" and="" y="17.1831." (d)="" n="31.62" =="" 32,="" and="" y="17.1831." (e)="" none="" of="" the="" above.="" the="" correct="" answer="" is="" (а)="" (b)="" (c)="" (d)="" (e)="" n/a="" (select="">