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Sandra's Hair Salon

APSTAT-U1JUES

Each month, the manager of Sandra's Hair Salon randomly chooses $25$ customers to respond to a customer satisfaction survey. Suppose $85\%$ of the clients at Sandra's Hair Salon are completely satisfied with their salon service.

What are the mean and standard deviation of the sampling distribution of the proportion of clients who are completely satisfied with their salon service when $25$ customers are sampled?

A

${ \mu }_{ \hat { p } }=(25)(0.85)\\\ { \sigma }_{ \hat { p } }=\sqrt { \frac { (25)(75) }{ 0.85 } }$

B

${ \mu }_{ \hat { p } }=(25)(0.85)\\\ { \sigma }_{ \hat { p } }=\sqrt { \frac { (0.85)(0.15) }{ 25 } }$

C

${ \mu }_{ \hat { p } }=0.85\\\ { \sigma }_{ \hat { p } }=\sqrt { \frac { (25)(75) }{ 0.85 } }$

D

${ \mu }_{ \hat { p } }=0.85\\\ { \sigma }_{ \hat { p } }=\sqrt { \frac { (0.85)(0.15) }{ 25 } }$

E

${ \mu }_{ \hat { p } }=\frac { 0.85 }{ 25 } \\\ { \sigma }_{ \hat { p } }=\sqrt { \frac { (25)(75) }{ 0.85 } }$