All in the P
We do this when the P value is less than alpha
assume the null is false
What formula is used to find the critical value given a level of significance of .05 and the population standard deviation?
=ABS(NORMSINV(.025))
In order to reduce the chances of an error when rejecting the null hypothesis, you would want to reduce this
level of significance
A tail test of a distribution used when assessing if the Ha is not equal to a value
Two-tailed test
The smaller the sample, the __________ accurate the sample mean will be as an estimate of the population mean
Less
The data is this when the P value is less than the level of significance
statistically significant
Given an assumed mean of 69 and a standard deviation of 4.2, what is the formula to find the z score of a value of 75?
=STANDARDIZE(75,69,4.2)
If you calculated a p value of .0247 with a level of significance of .05, and the null is actually true, what type of error have you made?
(Type I error)
A statement that claims equality and is always assumed to be true
The null hypothesis
All else equal, an increase in the level of confidence will cause a(n) ______ in the size of a confidence interval.
Increase
The probability of observing the experiment result, a sample mean, for example, or something more unusual just by chance if the null hypothesis is true
p-value
What formula is used to find the critical value given a significance level of .05 and a sample of 41?
=T.INV.2T(.05,40)
What type of error have you committed when your p value is higher than your alpha and the null is true?
No error
Statistic test used for hypothesis testing when sigma is unknown
T-test
If a z-score is equal to zero what must be true
The x-value must be equal to the mean of distribution
The P-value decreases by doing what to the sample size?
Increasing
What formula is used to find the standard error of the proportion?
=SQRT(p*q/n) OR =SQRT(p*(1-p)/n)
If you calculated a p value of .0526 with an alpha of .05 an the null is false, what error have you committed?
Type ll
A teacher states the cost for materials needed in the course is less than $50. What is the null hypothesis in words?
The course materials cost greater than or equal to $50
An MGQ 301 student wants to determine if more than 15% of students dropped the class after the first exam. What would be true if the student made a Type 1 error?
The student claims more than 15% of students dropped when 15% or less dropped
The sample mean equals the hypothesized value for the population mean under this condition
P=1
Given a test statistic of 2.05 and a population standard deviation of 69, what formula is used to compute the p-value of a right hand test?
=1-NORMSDIST(2.05,TRUE)
Beta is the probability of making what type of error?
Type II
What is the correct variable in replacement of the question mark in the following statistic formula used for hypothesis testing and what does it represent?
z = (x-μ)/(?/n)
Sigma (𝛔) - population standard deviation
For a standard normal distribution, find: P(z > 1.17)
0.8790