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Stats 6.2-7.4
Test 3
Question | Answer |
---|---|
6.2 | |
uniform distribution | values spread evenly over the range of possibilities |
Standard normal distribution | normal probability distribution with mean=0 and stand. deviation=1 |
normal cdf | probability |
inv.norm. | z-score |
6.3 | |
z score formula | x-mean/stand. dev. |
Standard error of the mean o x | mean/square root of n |
Sample of Values | _ x-mean/stand.Dev./Sqare root of n |
7.2 | |
Point Estimate | single value(or point) used to approximate a population parameter |
Confidence Interval | range of values used to estimate the true value of a population parameter |
Confidence level | probability 1-a |
critical value | number on the borderline seperating sample statistics that are likely to occur from those that are unlikely to occur(z a/2) |
Margin of error | denoted by E,maximum likely difference |
Round off rule-CI | 3 digits |
Round off rule-Sample size | larger whole number, can't have half a person |
sample size for population mean | n=[za/2o /e]^2 |
Degrees of Freedom | number of sample values that can vary after certain restrictionsw have been imposed on all data values |
Degrees of freedom formula | n-1 |
Zinter | mean is known and n>30 |
Tinter | mean NOT known and n>30 |