# Statistics, hypothesis testing

• May 27th 2013, 01:36 PM
MathJack
Statistics, hypothesis testing
Hi guys for part (c), Im not sure what to use for the standard deviation in the t-test, any help greatly appreciated

A vegetable producer is interested in the evolution of weekly sales on a particular product over
the past 6 months. Historical data indicated an average weekly sales per retailer of 2,400 units
of the product, over the past 6 months. Following a change in the advertising strategy for this
product, a random sample of sales from 134 di erent retailers was gathered and an average
weekly sale of 3,593 units per retailer was calculated. Consider that the aim of this study is to
assess whether the weekly sales of the product have signi cantly increased.
(a) State whether you would carry out a one-sided or a two-sided test.
(b) State the null and alternative hypotheses.
(c) Compute the value of the t-test statistic.
(d) Explain whether you would accept the null hypothesis and why
• May 27th 2013, 03:00 PM
HallsofIvy
Re: Statistics, hypothesis testing
You are the one who is taking the course, do you not know the meanings of any of these words? What is the difference between a "one-sided" and "two-sided" test? What is a "null hypothesis"? What is a "t-text statistic"?
• May 27th 2013, 03:09 PM
MathJack
Re: Statistics, hypothesis testing
I am looking for part (c), for the test stat I do not know what to insert for the deviation..
• May 27th 2013, 05:05 PM
MathJack
Re: Statistics, hypothesis testing
Any help? I have a test tmw, it is only part (c), I know the formula etc for t-test statistic but I do not know what to use for standard deviation, how do I compute this, sorry I'm probably leaving out something completely blatant
• May 28th 2013, 01:17 AM
MathJack
Re: Statistics, hypothesis testing
SE = s/root(n), would I use this to find the sample deviation somehow? or the difference between two means formula, badly need help