emblemhacks
24.04.2020 •
Mathematics
A sociologist found that in a random sample of 50 retired men, the average number of jobs they had during their lifetimes was 7.2. The population standard deviation is 2.1.
What variable are you studying?
A. Retirement age
B. Lifetime expectancy
C. Number of jobs in a lifetime
Find the 95% confidence interval of the mean number of jobs. We are 95% confident that the true mean number of jobs is between:
A. 6.0 and 6.5
B. 6.6 and 7.8
C. 6.4 and 7.1
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Ответ:
4/10 of the book
Step-by-step explanation: