Question 922873
 sd(sample) = 6.1
(a) What is your best estimate of the population mean? (Omit the "$" sign in your response.) 63
 <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi

Re TY...
1) asks for 2 decimal points
2) (small sample < 30)
b) 99% CI ((Round your answers to 2 decimal places)
SE = 6.1/sqrt(23)= 1.15
Sample is Small < 30, Using critical t-value(DF = 22) = 2.82
ME = 2.82SE = 2.82(1.15) = 3.24
Using two decimal points... IF not rounding off per mean:
CI:  63-3.24 < u < 63 + 3.24
CI: (59.76, 66.24)
.......
(c) 
 How large a sample is needed to assess the population mean with an allowable error of $1 at 90 percent confidence? (Round up your answer to the next whole number.)
ME = 1.645(6.1/sqrt(n)
1 = 1.645(6.1/sqrt(n))
n = [1.645(6.1)]^2 = 101 rounded Up
..........
 = CI	z = value
90%	z ={{{ highlight_green(1.645)}}} 
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576 
..............
	0.1	0.05	0.01	0.001
1	6.31	12.71	63.66	636.62
2	2.92	4.3	9.93	31.6
3	2.35	3.18	5.84	12.92
4	2.13	2.78	4.6	8.61
5	2.02	2.57	4.03	6.87
6	1.94	2.45	3.71	5.96
7	1.89	2.37	3.5	5.41
8	1.86	2.31	3.36	5.04
9	1.83	2.26	3.25	4.78
10	1.81	2.23	3.17	4.59
11	1.8	2.2	3.11	4.44
12	1.78	2.18	3.06	4.32
13	1.77	2.16	3.01	4.22
14	1.76	2.14	2.98	4.14
15	1.75	2.13	2.95	4.07
16	1.75	2.12	2.92	4.02
17	1.74	2.11	2.9	3.97
18	1.73	2.1	2.88	3.92
19	1.73	2.09	2.86	3.88
20	1.72	2.09	2.85	3.85
21	1.72	2.08	2.83	3.82
22	1.72 	2.07	{{{ highlight_green(2.82)}}} 	3.79
23	1.71	2.07	2.82	3.77