1.) A random sample of 50 students showed a mean weight of 120lbs. The population standard deviation for the weight is 1

[answerhappygod]

1.) A random sample of 50 students showed a mean weight of
120lbs. The population standard deviation for the weight is 10lbs.
The past study showed that the true mean is 124lbs. Is this mean
still holds. Test at .𝛼=.05.
Note: You are asked here to TEST the MEAN of the population. Use
CASE 1 in the TEST OF HYPOTHESIS for one single mean. Why do we use
CASE1?
2.) A random sample of 50 students showed that 12 are
overweight. From the past study , the percentage of overweight Is
found to be 15%. Has it increased? TEST at . 𝛼=.05
Note: You are asked here to TEST the PROPORTION of the
population.