Question

6. Find the critical value t_{a} for the given data
set.

a) A sample of size n= 9 with a corresponding 95% confidence interval.

b) A sample of size n= 29 with a corresponding 99% confidence interval.

Answer #1

Use Table A.3 to find the critical value 2
ta/2 needed to construct a confidence interval
of the given level with the given sample size:
a. Level 99%, sample size 19
b. Level 90%, sample size 172

1) Find the critical value t (a/2) needed to construct a
confidence interval of the given level with the given sample size.
Round the answers to three decimal places
a) 98% sample size 11
critical value-
b) for level 95% and sample size 25
critical value-
c)for level 99% and sample size 14
2) a sample of size n equals 45 has a sample mean X equals 56.9
and sample standard deviation s equals 9.4.
construct a 99% confidence interval...

Find the critical t-value corresponding to a sample size of 29
and a confidence level of 90%.

Find the critical value
t/α2
needed to construct a confidence interval of the given level
with the given sample size. Round the answers to three decimal
places.
(a) For level
99.5%
and sample size
6
(b) For level
95%
and sample size
15
(c) For level
80%
and sample size
29
(d) For level
98%
and sample size
12

a.) Given a normal distribution with σ = 0.380. Find the
required sample size for a 95% confidence level (estimating the
mean), given a margin-of-error of 6%.
b.) Given the sample results taken from a normal population
distribution: mean = 4.65, σ = 0.32, and n = 17.
For a 99% confidence interval, find the margin-of-error for the
population mean. (use 2 decimal places)
c.) Given the sample results taken from a normal population
distribution: mean = 1.25, σ =...

Find the critical value t a/2 needed to construct a confidence
interval of the given level with th sample size. Round the amswers
to theee decimal places.
For level 95% and sample size 11?
For level 98% and sample size 26?
For level 99% and sampke size 12?

Identify the critical t. An independent random sample is
selected from an approximately normal population with unknown
standard deviation find the degrees of freedom and the critical t
value (t*) for the given sample size and confidence level.
n=6,CL=90%
N=21, CL=98%
n=29, CL= 95%
n=12,CL=99%

Find the critical value
t/α2
needed to construct a confidence interval of the given level
with the given sample size. Round the answers to three decimal
places.
Part 1 of 4
(a) For level
99%
and sample size
5
Part 2 of 4
(b) For level
90%
and sample size
14
Part 3 of 4
(c) For level
99.5%
and sample size
28
Part 4 of 4
(d) For level
95%
and sample size
11

1. Do one of the following, as appropriate: (a) Find the
critical value zα/2, (b) find the critical value
tα/2, (c) state that neither the normal nor the t
distribution applies.
90%; n = 10; σ is unknown; population appears to be normally
distributed.
Group of answer choices
A. zα/2 = 2.262
B. zα/2 = 1.383
C. tα/2 = 1.833
D. tα/2 = 1.812
2. Find the margin of error.
95% confidence interval; n = 91 ; = 53, s =...

Find the critical value of t for a sample size of 27 and a 99%
confidence level.

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