midterm 2

Question 1

Normal probability distribution

Answer 1

total area under the curve is 1.0
curve is symmetric about the mean
two tails of the curve extend indefinately

Question 2

standard normal distribution

Answer 2

µ = 0
ø = 1

Question 3

population distribution

Answer 3

probability distribution of the population data

Question 4

sampling distribution

Answer 4

The probability distribution of a sample statistic

Question 5

estimation

Answer 5

The assignment of values to a population parameter based on a value of the corresponding sample statistic

Question 6

estimator

Answer 6

sample statistic used to estimate a population parameter

Question 7

estimate

Answer 7

the values assigned to a population parameter based on the value of a sample statistic

Question 8

point estimate

Answer 8

the value of a sample statistic that is used to estimate a population parameter

Question 9

interval estimation

Answer 9

an interval is constructed around the point estimate and it is stated that this interval is likely to contain the corresponding population parameter

Question 10

margin of error

Answer 10

the number we add to and subtract from the point estimate

Question 11

confidence level

Answer 11

quantifies the chance that an interval contains the unknown population parameter

Question 12

t distributions have

Answer 12

more area in the tails than standard normal distributions

Question 13

alternative hypothesis

Answer 13

a claim about a population parameter that will be declared true if the null hypothesis is declared to be true

Question 14

type I error

Answer 14

when a true null hypothesis is rejected

å = P(H0 is rejected|H0 is true)

Question 15

type II error

Answer 15

when a false null hypothesis is not rejected

ß = P(H0 is rejected|H0 is true)

Question 16

power of the test

Answer 16

1-ß