The mean number of past relationship partners for the population of...

The mean number of past relationship partners for the population of people between the ages of 18 and 26 years living in the U.S.A is µ = 4.8. The standard deviation is  = 2.4.  A psychologist predicts that the mean number of past relationship partners for introverts will be significantly different from the mean of the population. The mean number of past relationship partners for a sample of 55 introverts aged 18 to 26 years is M = 3.2.

Complete step 3 of the hypothesis testing procedure and calculate z or t, whichever is appropriate for these data.  Round to the nearest hundredths place.  If your calculated z or t is not identical to one of the values below, but within plus or minus 0.16 of an answer below, assume it's a rounding error and select the answer that is closest to your calculated value.  Ignore the minus sign if your calculated z or t is negative.

Group of answer choices

4.95

3.95

0.58

6.22

the correct answer is not listed, even when taking into consideration a rounding error of + or - 0.16