In a test of physical fitness, a group of men ages 65 and older from a local

retirement community were told to do as many sit-ups as they could. It is known the population meanis 20 with The scores for the men from the retirement community are given below. Use a two-tailed rejection region with a total area of 0.05. What is the sample mean?

24 25 10 23 18 29 47 32

19 24 20 28 21 20 27 25

The sample mean = 24.5

Step-by-step explanation:

Solution:

Using the one sample z test

Since the test is a two tailed test

Null hypothesis,  H₀: μ = 20.

Alternative hypothesis, Ha: µ ≠ 20

The test statistic formula is given by:

The population mean,  µ = 20

The sample mean,

n = 16

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.  

the answer is y = 11.54

hope this : )