As sample size gets larger, the margin of error gets: (check all that are correct) O smaller no matter what happens to the standard deviation. O larger no matter what happens to the mean. gets smaller if the confidence level stays the same. smaller unless the standard deviation gets larger. O smaller only as long as the mean remains the same. smaller no matter what happens to the mean. O gets smaller if the confidence level goes down. gets larger if the confidence level goes down. O larger as long as the mean remains the same. O may get smaller or larger if the confidence level goes down.

Suppose you calculate a z-score of -2.2 and the distribution is normal. Then which of the following is a correct interpretation?   Group of answer choices None of the above are justified interpretations   The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 2.5% of the observations.   The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 5% of the observations   The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 2.5% of the observations.   The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 5% of the observations.

The second box options are so not reject & reject the third box options are is not and is. Pls help i need in an hour Thankyou.

A mechanic sells a brand of automobile tire that has a life expectancy that is normally distributed, with a mean life of 36,000 miles and a standard deviation of 2100 miles. He wants to give a guarantee for free replacement of tires that don't wear well. How should he word his guarantee if he is willing to replace approximately 10% of the tires? Click to view page 1 of the table. Click to view page 2 of the table. CHE Tires that wear out by miles will be replaced free of charge. (Round to the nearest mile as needed.)