Question

A health insurance broker records the monthly extended health and dental insurance premiums for 18 non-smoking white-collar clients between the ages of 31 and 40 (measured in $):

48	130	66	96	147	65	131	105	112
139	61	47	131	51	95	60	99	95

T-Distribution Table

a. Calculate the sample mean and standard deviation.

x̄ = x̄ =

Round to the nearest cent

s=s=

Round to the nearest cent

b. Construct a 95% confidence interval for the mean monthly insurance premium for all non-smoking white-collar clients between the ages of 31 and 40.

  <  μ  <  <  μ  <  

Round to the nearest cent

Please provide correct answers. thanks

Answer 1

48	-45.22	2044.8484
139	45.78	2095.8084
130	36.78	1352.7684
61	-32.22	1038.1284
66	-27.22	740.9284
47	-46.22	2136.2884
96	2.78	7.7284
131	37.78	1427.3284
147	53.78	2892.2884
51	-42.22	1782.5284
65	-28.22	796.3684
95	1.78	3.1684
131	37.78	1427.3284
60	-33.22	1103.5684
105	11.78	138.7684
99	5.78	33.4084
112	18.78	352.6884
95	1.78	3.1684

Refer t-table or use excel function "=T.INV.2T(0.05,17)" to find the critical value of t.