An experiment is set up to study the weights of 35 mice after they are injected with a drug. the population mean is 23.50 grams with a standard deviation of 3.40 grams. the standard error of the sample mean is (round off your answer to the nearest hundredth.)

Ok you need to add 23.50+3.40
what do you get?
26.9
Round it to the nearest hundreth what do you get?
26.10 is your final answer

26.10 is the answer because, 23.50 + 3.40 = 26.9 then you said you wanted it to be rounded so it would equal 26.10.

95% confidence Interval would be between $18.775 and $20.225.

Step-by-step explanation:

Confidence Interval can be calculated using M±ME where

M is the sample mean Americans spend on coffee during week. ($20)ME is the margin of error from the mean

And margin of error (ME) around the mean calculated as

ME= where

z is the corresponding statistic in 95% confidence level (1.96)s is the population standard deviation ($5)N is the sample size (64)

Using the numbers, we get:

ME= =1.225

Then 95% confidence Interval would be 20±1.225 or between $18.775 and $20.225