Question

If you dont have a table of critical values, how can you calculate the critical value from the confidence level

Answer #1

If we do not have table for critical value table then we can use excel formula for Normal distribution, T distribution, And Chi square distribution.

For example if the distribution is normal and the confidence level is given then using excel formula which is =NORM.S.INV(CONFIDENCE LEVEL) , is used to find for a right tailed test, if for left tailed test the Formula used is =NORM.S.INV(1-CONFIDENCE LEVEL) and if it is for two tailed test then the formula used is =NORM.S.INV(CONFIDENCE LEVEL+1/2*(1-CONFIDNECE LEVEL))

Note the confidence level used here is nor the percentage value but the proportion value.

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...

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...

Calculate the Y values corresponding to the X values given
below. Find the critical values for X for the given polynomial by
finding the X values among those given where the first derivative,
dy/dx = 0 and/or X values where the second derivative,
d2y/dx2 = 0. Be sure to indicate the sign (+
or -) of dy/dx and of d2y/dx2 tabled values.
Reference Power Point Lesson 13 as needed. Using the first and
second derivative tests with the information you...

Calculate the Y values corresponding to the X values given
below. Find the critical values for X for the given polynomial by
finding the X values among those given where the first derivative,
dy/dx = 0 and/or X values where the second derivative,
d2y/dx2 = 0. Be sure to
find the sign (+ or -) of dy/dx and of
d2y/dx2 at all X values. Reference Lesson 13
and the text Appendix A (pp 694 – 698), as needed. Using the...

Calculate the Y values corresponding to the X values given
below. Find the critical values for X for the given polynomial by
finding the X values among those given where the first derivative,
dy/dx = 0 and/or X values where the second derivative,
d2y/dx2 = 0. Be sure to
find the sign (+ or -) of dy/dx and of
d2y/dx2 at all X values. Reference Lesson 13
and the text Appendix A (pp 694 – 698), as needed. Using the...

The commonly used critical Z values are 1.645 for a 90%
confidence interval (or 2-tailed, .10 level of significance), 1.96
for 95% confidence and 2.58 for 99% confidence. If a different
confidence level is required, such as 92%, how can you determine
the critical Z value?
What is the relationship between the confidence level and the
level of significance of a 2-tail test?
Which Hypothesis Tests use Z distributions?
Which Hypothesis Tests use a Student’s t distribution?
Which Hypotheses Tests...

Using a table of critical t-values of the t distribution, find
the range of values for the P-value for a two-tailed test with
nequals14 and test statistic t equals 1.794 .

Find the critical value or values for the following values of
the significance level α, sample size n, and alternate hypothesis
H1. The critical value is α = 0.05, n = 7, H1: μ < μ0

Your degrees of freedom is 55. Looking at the table of critical
values for the correlation coefficient, you can see that there are
only entries for 50 and 60 degrees of freedom, not 55. If you want
to be more conservative, which entry should you choose?

Critical values for quick reference during this activity.
Confidence level
Critical value
0.90
z∗=1.645
0.95
z∗=1.960
0.99
z∗=2.576
Jump to level 1
In a poll of 1000 randomly selected voters in a local election,
728 voters were against school bond measures. What is the sample
proportion p^? (Should be a decimal answer)
What is the margin of error m for the 95% confidence level?
(Should be a decimal answer)

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