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# Uni Flash Cards

### Stats

QuestionAnswer
What is the main purpose of the 95% CI for a mean? To estimate the population mean
How is the width of a CI for a mean determined? The t-multiplier and the standard error of the estimate
Heights of 18yer old students Female: n = 10, m = 168 cm, s = 7.5 Male: n = 12, m = 180 cm, s = 7.25 What is an approxamite of the standard error of the difference between the sample means? 0.28
Heights of 18yer old students Female: n = 10, m = 168 cm, s = 7.5 Male: n = 12, m = 180 cm, s = 7.25 What is the degrees of freedom associated with the s.e. of the difference between the sample means? 21
Heights of 18yer old students Female: n = 10, m = 168 cm, s = 7.5 Male: n = 12, m = 180 cm, s = 7.25 What is the value of t for the CI of 95% for the entire sample size? t = 2.08
Heights of 18yer old students Female: n = 10, m = 168 cm, s = 7.5 Male: n = 12, m = 180 cm, s = 7.25 The 95% CI for m(F) - m(M) is (15.51, 8.49). Interprete it. With 95% confidence we can estimate that the difference between the height of 18 year old men and the height of 18 year old women is somewhere bwtween 8.49cm and 15.51cm.
What is the type of error associated with asking people to do an online survey. Self-selection bias
Selection Bias When a group is surveyed that doesn't have a connection with the population of interest
Self-selection Bias When a group has the choice of replying to a survey
Created by: Gabby21924