Definition & Symbol
a statistical hypothesis that contains a statement of equality
What is null hypothesis Ho
We use a t-test for the mean when the ___________ standard deviation is unknown.
What is population
Formula for finding degrees of freedom
What is n - 1
The range of values for which the null hypothesis is not probable. If a test statistic falls in the region, the null hypothesis is rejected.
What is rejection region
If the alternative hypothesis Ha contains the less-than inequality symbol (<) then it is what type of test
What is left-tailed test
Find the critical z value for a right-tailed test when alpha = .05
What is 1.645
It states, if the sample is large enough the distribution will be normal
What is Central Limit Theorem?
If the alternative hypothesis Ha contains the greater-than inequality symbol (>), then it is what type of test
What is right-tailed test
separates the rejection region from the nonrejection region
What is critical value Zo
In a hypothesis test, the ____________ is your maximum allowable probability of making a type 1 error. It is denoted by a, the lowercase Greek letter alpha
What is Level of significance
if the alternative hypothesis Ha contains the not-equal-to symbol, it is what type of test
What is two-tailed test
A company claims that at least 82% of its employees are satisfied with their job. Write the correct hypotheses and determine which is the claim.
What is:
H0: p is greater than or equal to .82 (claim)
HA: p < .82
A measure of how spread out the data is
What is standard deviation?
(variance is also acceptable)
Hypothesis tests are designed to measure the _________ of evidence against the null hypothesis.
Strength
This is the Z test formula.
Z=( x̅ -µ)/ (σ /√ n)