A study of 40 white mice showed that their average
weight was 3.20 ounces. The
standard deviation of the
population is 0.8 ounces. Which
of the following is the 80%
confidence interval for the mean
weight per white mouse?

And the confidence interval would be between (3.035;3.365)    

Step-by-step explanation:

Information given

represent the sample mean

population mean (variable of interest)

s=0.8  represent the sample standard deviation

n=40 represent the sample size  

Confidence interval

The confidence interval for the mean is given by the following formula:

  (1)

The degrees of freedom are given by:

The Confidence level is 0.80 or 80%, the significance  would be and , and the critical value would be

Now we have everything in order to replace into formula (1):

And the confidence interval would be between (3.035;3.365)    

b

step-by-step explanation:

no association

step-by-step explanation:

if you have eyes and you can use them efficiently you can see that it just looks like random dots like do a line of best fit and like they're so spread out it's such a weak association you might as well consider it nonexistent