Question

Use Table A.3 to find the critical value 2
t* _{a}*/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

Answer #1

Solution :

Given that,

a.

n = 19

df = n - 1 = 19 - 1 = 18

At 99% confidence level the t is ,

= 1 - 99% = 1 - 0.99 = 0.01

/ 2 = 0.01 / 2 = 0.005

t /2,df = t0.005,18 = 2.878

The critical value t
/2 = **2.878**

b.

n = 172

df = n - 1 = 172 - 1 = 171

At 90% confidence level the t is ,

= 1 - 90% = 1 - 0.90 = 0.1

/ 2 = 0.1 / 2 = 0.05

t /2,df = t0.05,171 = 1.654

The critical value t
/2 = **1.654**

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.
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

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?

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

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

6. Find the critical value ta 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.

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

What critical value t* from the t-table would you use for a
confidence interval for the mean of the population in each of the
following situations? NOTE: The critical value is just another name
for the t* values we read off from the type of T Table you have in
your notes. (Use 3 decimal places)
(a) A 95% confidence interval based on 4 observations
(b) A 99% confidence interval from an SRS of 9 observations
(c) An 90% confidence...

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...

1)Find the critical value zα/2 needed to construct
a(n) 97% confidence interval
2)A college admissions officer takes a simple random sample of
110 entering freshmen and computes their mean mathematics SAT score
to be 465. Assume the population standard deviation is
Construct a 90% confidence interval for the mean mathematics SAT
score for the entering freshmen class.
3)
In a small-overlap front crash test, a car is crashed into a
simulated telephone pole and the maximum intrusion of debris into...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 7 minutes ago

asked 8 minutes ago

asked 9 minutes ago

asked 18 minutes ago

asked 25 minutes ago

asked 38 minutes ago

asked 38 minutes ago

asked 41 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago