t-distribution Confidence Level 60 70 80 85 90 95 98 99 99 8 99 9 Level of Significance 2 Tailed
tt.pdf
same as P(Z ? z 025)=0 975 Either from memory, a table or using the Find a 90 z confidence interval for µ, given that ? = 2 For the remaining parts,
class21-slides-all.pdf
Table A 1: Normal Critical Values for Confidence Levels Table A 2: Critical Values for t-Interval Degrees of Freedom (df) 80 90
appendix_table.pdf
Our confidence interval is p±z*SE(p) ? p is the sample proportion Confidence # standard deviations (z) 50 0 67449 75 1 15035 90 1 64485
Confidence%20Intervals.pdf
z 0 000 0 674 0 842 1 036 1 282 1 645 1 960 2 326 2 576 3 090 3 291 0 50 60 70 80 90 95 98 99 99 8 99 9 Confidence Level
t-table.pdf
In the above example, a confidence level of 95 was selected The value of z* for a specific confidence level is found using a table in the back of a statistics
confidence_intervals_notes.pdf
selected from a normal distribution, whose mean was known to be 50 For each of the 10 samples, the mean and 90 confidence intervals were calculated
PharmStats.pdf
The confidence level is given at the bottom of the table Page 24 Example 3: Normal data – sample size 3, using t-dist
stat301CI_t-dist.pdf
If the level of confidence is 90 , this means that we are 90 confident that the interval contains the population mean, µ z z = 0 ?zc zc The corresponding z
lfstat3e_ppt_06.pdf