A local service agency hires you to estimate the average annual income of all 700 families living in a four square block section. Since time and funds are limited, yu take a random sample of 50 families and want the estimate to have a 92% confidence level. The 50 families had an average income of $35,300. Research shows the population standard deviation for annual income in this four square block section is $1,800

The true estimate of  the average annual income of all 700 families living in a four square block section lies within the 92% confidence interval below

Step-by-step explanation:

From the question we are told that

    The  sample size is  n =  50  

    The sample mean is

     The population standard deviation is  

From the question we are told the confidence level is  92% , hence the level of significance is    

=>  

Generally from the normal distribution table the critical value  of   is  

Generally the margin of error is mathematically represented as  

=>  

=>  

Generally 92% confidence interval is mathematically represented as  

=>

=>

So the true estimate of  the average annual income of all 700 families living in a four square block section lies within the 92% confidence interval

the answer is 31.27mph

i'm sorry i don't know

step-by-step explanation: