Critical z Values
Find the critical value that corresponds to the confidence level 90%.
z=1.645
For the given n=1084, x=534 and confidence level of 95% find the best estimate for population proportion p.
0.493
Find the critical value t corresponding to a 95% confidence level, given the sample size of n=15.
t=2.145
For the given sample of size n=108, mean of the sample 98.3 and standard deviation s=0.69 construct the 99% confidence level that estimates the mean of population.
(98.126,98.474)
What is the number of degrees of the freedom for n=24?
23
Find the critical value that corresponds to the confidence level 95%.
z=1.96
For the given n=1084, x=534 and confidence level of 95% find the margin of error E.
E=0.030
Find the critical value t corresponding to a 90% confidence level, given the sample size of n=25.
t=1.711
For the given sample of size n=24, mean of the sample 76.1 and standard deviation s=24.7 construct the 90% confidence level that estimates the mean of population.
(67.5,84.7)
Do you use t score or z score when the population standard deviation is given?
z score
Find the critical value that corresponds to the confidence level 99%.
z=2.575
For the given n=1084, x=534 and confidence level of 95% construct the confidence interval.
0.463<p<0.522
Find the critical value t corresponding to a 99% confidence level, given the sample size of n=30.
t=2.756
For the given sample of size n=39, mean of the sample 65400 and standard deviation of the population is 11598 construct the 90% confidence level that estimates the mean of population.
(62345,68455)
Do you use t score or z score when the sample standard deviation is given?
t score
Find the critical value that corresponds to the confidence level 87%.
z=1.51
For the given n=375, x=300 and confidence level of 99% construct the confidence interval.
0.747<p<0.853
Find the critical value t corresponding to a 80% confidence level, given the sample size of n=40.
t=1.304
For the given sample of size n=36, mean of the sample 64900 and standard deviation of the population is 19152 construct the 99% confidence level that estimates the mean of population.
(56678,73122)
Find the sample size n to estimate the mean score with the 95% confidence level for given mean of the sample 100, standard deviation of the population 10, and margin of error E=2.
n=97
Find the critical value that corresponds to the confidence level 85%
z=1.44
For the given n=412, x=160 and confidence level of 90% construct the confidence interval.
0.249<p<0.311
Find the critical value t corresponding to a 98% confidence level, given the sample size of n=10.
t=2.821
For the given sample of size n=14, mean of the sample 96.3 and standard deviation s=24.5 construct the 95% confidence level that estimates the mean of population.
(82.2,110.4)
Find the sample size n to estimate the mean score with the 99% confidence level for given mean of the sample 100, standard deviation of the population 8, and margin of error E=6.
n=107