What type of Confidence Interval? Flashcards

1

Sample of 10 locations had mean 3 inches std dev 1 inch of snow yesterday.

2

16 of 30 students surveyed were happy to have a snow day yesterday.

3

What are degrees of freedom?

4

Which is not a necessary condition for a t-test?

5

A school wishes to estimate the mean age of students. Mean age µ: 22.9 yrs, std dev s: 1.5 yrs

6

A t-test is used to test hypotheses about μ when the population standard deviation is

7

A z-test is used to test hypotheses about μ when the population standard deviation is

8

20 mortgage companies have a mean rate of 4.25%, with unknown shape. The std dev for all mortgage companies is 2.1%

9

A college wishes to estimate the mean age of students. Mean age µ: 22.9 yrs, std dev σ: 1.5 yrs

What type of Confidence Interval?