How many standard deviations is my hypothesis (sample mean) is away from the actual (null hypothesis population mean) T – statistic

Rejecting the null may be a mistake = p –value

ONE SAMPLE
3 formulas
T.Dist.rt (t, sample size - 1 “df”) -> alternative that mu is bigger than a 1 – T.Dist.rt (t, sample size – 1) -> mu is less than a T.Dist.2t(t,samplesize - 1) -> not equal to

p < significant level reject the null

NEVER accept null

TWO SAMPLE
directly get the p-value
chance that under the null hypthoesis, you have a difference in the sample mean that is as extreme or more as what you have now. If that probability is small, it is something in the nature not due to chance.

* Paired: T.Test (sample 1, sample 2, # of tails , 1)
* not equal to: number of tails = 2
* greater than or less than: number of tails = 1
* Type 1 = paired data (ex: every UNC mba student’s salary before they entered the program and salaries after graduate ) * salaries have a significant increase after mba?
*
* Independent: T.Test (sample 1, sample 2, # tails, 2)
* Type 2 = independent (ex: UNC mbas vs. DUKE mbas)
*
*
*
* Regression Coefficient:
*
* Null hypothesis: THIS regression coefficient = 0
* alternative hypothesis: THIS particular regression coefficient of interest is not 0 *
* (driver’s p-value and coefficient in ANOVA)
*
* THIS driver’s p-value is less than significant level, then the driver has a significant impact on the outcome. *
* ** for each individual driver
*
*
* Hypothesis test on a regression model as a whole:
*
* Null: All slope coefficients = 0 (R square being zero) * Alt: At least ONE slope coefficient is not equal to zero (R square greater than 0) *
* P-value is SIGNIFICANCE F on the ANOVA.
*
IF significance F < significant level, regression model is significant as a whole. *
*
*...

...
Final Project: Nyke Shoe Company
Barbara Greczyn
STA 201 - Principles of Statistics
Instructor Alok Dihtal
April 26, 2015
Introduction
Nyke Shoe Company has been in business for over 50 years. Over the last five years, the company has been undergoing some financial hardship due to an erratic market and an inability to understand what the consumer actually needs. In a last ditch effort to avoid bankruptcy, they have adopted a new...

...
HYPERLINK "http://www.finalexamanswer.com/QNT-561-Final-Exam_p_61.html" DOWNLOAD ANSWERS
QNT 561 FinalExam
1) Which of the following measures of central location is affected most by extreme values? A. MeanB. MedianC. Mode D. Geometric mean
2) A correlation matrix…A.Shows all simple coefficients of correlation between variablesB. shows only correlations that are zeroC. shoes the correlations that are positiveD. shows only the correlations that...

...
Statistics
BUS308: Statistics for Mangers
Instructor:
Learning Statistics
Statistical data has become an item that we see all around us in our everyday lives, from television programs talking about selling products or politicians using data to show how they perform in their jobs, in hopes to be reelected. Throughout the course in Statistics for Managers, I have learned many things on how the use of statistical information can...

...BUS 475 FinalExam
Copy this link to your browser and download:
http://www.finalexamguide.com/BUS-475-Final-Exam-3-227.htm
1) As Plant Controller, you are trying to determine which costs over which you have the most control on a day to day basis. Your goal is to achieve better profitability. The Plant Operations Manager suggests that overhead is the easiest area to directly reduce costs. Which of the following items would be...

...8.2.4-2
(Points: 5.0) Find the value of the test statistic z using z = .
The claim is that the proportion of drowning deaths of children attributable to beaches is more than 0.25, and the sample statistics include drowning deaths of children with 30% of them attributable to beaches.
a. 2.86
b. 2.71
c. -2.86
d. -2.71
11.
STAT10T 8.2.5-3
(Points: 5.0) Use the given information to find the P-value.
The test statistic in a...

...(-3.5)/1.6396 = -2.1347
Critical Value: Zα/2= Z0.05/2= @qnorm(1-0.05/2)= 1.96
When comparing the test statistic to the critical value: Z=2.1347>1.96, we reject the null hypothesis.
We can calculate the P-value using the EViews command:
Show @tdist (t, d.f)
In this EViews command, t stands for the appropriate test statistic and d.f are the degrees of freedom. The appropriate test statistic was calculated above, namely Z=2.1347. For the degrees of...

...entire population
CHAPTER 7: Sampling and SAMPLING DIST
A statistic is a number that describes a sample. The value of a statistic is known when we have taken a sample, but it can change from sample to sample. We often use a statistic to estimate as unknown parameter.
The sampling distribution of a statistic is the distribution of values taken by the statistic in all possible samples of the same size from the same...

...EMGT 571
STATISTICS I
TAKE HOME FINALEXAM
Problems – Answer the following problems…BE SURE TO SHOW ALL WORK!!!. You can use excel, SPSS or word as the medium for generating solutions to the problems. I recommend you use excel and SPSS
1. The time at which the mailman delivers the mail follows a normal distribution with a mean of 2:00PM and a standard deviation of 15 minutes (20 pts)
a) What is the probability that the mail will...

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