Question

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?

Answer #1

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 this question we need to use t critical value table )

**## For level 95% and sample size 11?**

**Answer** : degree of feedom = ( n-1 ) = 10

critical value = t ( a/2,10 ) = **+/- 2.228**

( T-Value (two-tailed): **+/- 2.228138** )

**## For level 98% and sample size 26?**

**Answer** : degree of feedom = ( n-1 ) = 25

critical value = t ( a/2, 25) = **+/- 2.485**

( T-Value (two-tailed): **+/- 2.485107 )**

**## For level 99% and sampke size 12?**

**Answer** : degree of feedom = ( n-1 ) = 11

critical value = t ( a/2, 11) = **+/- 3.106**

( T-Value (two-tailed): **+/- 3.105803)**

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 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

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

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 tα/2 needed to construct a
confidence interval of the given level with given sample
size.
Level 90%, sample size 21
Group of answer choices
1.725
1.325
1.721
1.645
2.
Find the probability P(-0.62 < z < -0.01) using the
standard normal distribution.
Group of answer choices
0.2284
0.3584
0.7716
0.1900

Determine the t critical value for a two-sided
confidence interval in each of the following situations. (Round
your answers to three decimal places.)
(a) Confidence level = 95%, df = 5
(b) Confidence level = 95%, df = 15
(c) Confidence level = 99%, df = 15
(d) Confidence level = 99%, n = 10
(e) Confidence level = 98%, df = 21
(f) Confidence level = 99%, n = 34

Find the critical value zα/2 needed to construct a 79%
confidence interval.

you are calculating a confidence interval for the population
mean. Find the critical value t* from the t-Distribution Critical
Values table for each of the following situations
A 95% confidence interval based on n = 12 observations.
A 99% confidence interval from a sample of two observations.
A 90% confidence interval from a sample of size 1001.
2. Suppose you conduct a hypothesis test for the following
hypotheses from a sample of n = 25 observations, and you calculate
a...

Construct a confidence interval of the population proportion at
the given level of confidence.
x=540, n=1100, 95% confidence
The lower bound of the confidence interval is _______.
(Round to three decimal places as needed.)
The upper bound of the confidence interval is_______.
(Round to three decimal places as needed.)

We use the t distribution to construct a confidence
interval for the population mean when the underlying population
standard deviation is not known. Under the assumption that the
population is normally distributed, find
tα/2,df for the following
scenarios. (You may find it useful to
reference the t table. Round your
answers to 3 decimal places.)
tα/2,df
a.
A 95% confidence level and a sample of 10 observations.
b.
A 99% confidence level and a sample of 10 observations.
c.
A...

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