lecture 4

Question 1

Statistical hypothesis

Answer 1

is a testable statement with a probability distribution

Question 2

One sample test (T-Test)

Answer 2

Compares the mean of a single sample to a predetermined value.

Question 3

Null hypothesis for One sample Test (T-test)

Answer 3

the sample mean is = to the specified value. the null hypothesis would be that there is no/null/zero difference

Question 4

Alternative hypothesis for one sample Test(t -test)

Answer 4

the sample mean is not = to the specified value. the alt. would be that the sample mean is different from the specific value

Question 5

Two sample test (t-test)

Answer 5

Compares two independent sample means against each each other. (by testing the probability that the difference in the means =0

Question 6

the null hypothesis (two sample t-test)

Answer 6

null hypo: is that both means = 0 which mean that the (mean of sample one - mean of sample 2= 0

Question 7

the alternative hypothesis ( two sample t-test)

Answer 7

alt hypothesis: that the means of the samples are different from each other aka doesn’t = 0 after subtracting

Question 8

Test statistic

Answer 8

is where on the probability
distribution the sample lies

Question 9

T-score

Answer 9

represents how many standard deviations a data point is away from the mean in a t-distribution
Note used: in t-tests.

Question 10

P-value

Answer 10

is the probability of getting a test
statistic of that size or greater

Question 11

Type I error

Answer 11

where you reject the null when it is true (putting an innocent in prison)

Question 12

type II error

Answer 12

when you accept the null but it is false. (letting the guilty go free)

Question 13

scientific hypothesis

Answer 13

A statement that is testable with observations

Question 14

when P<.05

Answer 14

reject the null hypothesis (is statistically significant

Question 15

when P> .05

Answer 15

accept the null (is not statistically significant