3. Find the sample size needed to estimate the mean weight of cocker spaniels if we know their weight range from 25 lbs to 50 lbs. We wish to have 95% confidence and a maximum error of 3 lbs. (Round standard deviation to the nearest tenth but round the sample size UP to the nearest whole number.)

z₉₅=____________

standard deviation =____________

margin of error =______________

sample size =_____________