Aconsumer advocate wants to collect a sample of jelly jars and measure the actual weight of the product in the container. he needs to collect enough data to construct a confidence interval with a margin of error of no more than 3 grams with 95% confidence. the standard deviation of these jars is usually 3 grams. estimate the minimum sample size required.

n=3.8416≅4

So Minimum Sample Size is 4

Step-by-step explanation:

In order to find the minimum sample size, the formula we use will be:

Where:

n is sample size  

Z is the distribution

S is the standard deviation

E is the  Margin of error

S=3 ,E=3

For Z:

Alpha=1-0.95=0.05

Alpha/2=0.025=2.5%

From Cumulative Standard Distribution Table:

Z at Alpha/2 = 1.960

n=3.8416≅4

So Minimum Sample Size is 4

c) the median for town a 30" is greater than the median for town b 25"

step-by-step explanation:

town a, median = q2 = 30

town b, median - q2 = 25

so the median for town a 30" is greater than the median for town b 25"