Answer:
The test statistic (z-score) of this one-mean hypothesis test is z=1.823.
Step-by-step explanation:
The null and alternative hypothesis are:

The significance level is 0.05.
The sample size is n=22.
The sample mean is M=157.
The standard deviation is 18.
The z-score can be calculated as:

The test statistic (z-score) of this one-mean hypothesis test is z=1.823.
Answer:
13.5
Step-by-step explanation:
Answer:
45 people only if that equals 280 people together
Step-by-step explanation:
never mind i added it it is wrong wait i'll try again