Stats/List Editor on the TI-89 supports several types of regression,
among which are linear, quadrfatic, cubic, quartic, logarithmic, exponential, power, and multiple linear.
All of them work pretty much the same, so linear regression will be used as an example.
Use the lists listx (the x’s...
advertising budget also
influences the nature of such mix, in addition to the available
audience. For example, to achieve certain advertising objectives,
one may require to use a mix of 50% newspaper, 25% magazine
and the rest 25% television. However, more than one mix may fulfill
Positioning should be clearer as healthy drinks. More intense promotion strategies are suggested to increase the coverage, particularly on magazines, newspapers, bus advertisements and leaflets. Invite celebrities with energetic and healthy images as spokesmen. Some gimmicks...
two sides of the equation are equal, but occasionally, as in (d) above, they have only one. In fact, many
quadratic equations are insoluble. For example, Y 2 ¼ À9 has no real roots. We shall consider this again
when we look at quadratic graphs in the next chapter.
, we want to double the precision the number of observations in the sample should be increased four times.
3. The most important use of the standard errors is in the construction of confidence intervals within which parameter values are expected to fall. For a sufficiently large sample size, the...
classified can be ranked or ordered.
The interval level of measurement is the next highest level. It includes all the characteristics of the ordinal level, but, in addition, the difference between values is a constant size. An example of the interval level of measurement is temperature...
population of all voters who plan to vote for this candidate.
-Meaning of 95% confidence: If we use many random samples of size 300, 95% of Confidence Interval produced would contain the true population proportion of all voters planning to vote for the candidate.
-To find the correct Sample Size...
Variance and Standard Deviation
A Couple More Statistical Ideas
Standard Error of a Proportion
Comparing Results Using Confidence Bounds
Comparing Results Using Difference of ProportionsSize of Sample
What the Confidence Interval Really Means
Size of Test and Control for...
of y equals a small change in y
as a proportion of y. It is because of this calculus result that we use natural logs
instead of common logs in regression analysis. Because this table uses a discrete
change in EDUCATION, the 2.08% differs slightly from the continuous result
0.206 × (change in...
will not use that value. We will use a very simple hypothesis for the first example. We are testing whether the proportions of all the observed values of education are equal. To do this, choose the option “All categories equal” in the area "Expected Values.” Click on “OK.”
outlier is an extremely high or an extremely low data value when compared with the rest of the data values. |
1. The Histogram – or column diagram is a graph consisting of a series of vertical columns or rectangles each drawn with a base equal to the class interval and a...
-person account, autobiographies, diaries
d. Secondary data are republished by another researcher or agency. It refers to information which is taken from published or unpublished data which were previously gathered by other individuals and agencies
Example: published books, newspapers, magazines...
Chapter 6 (Motivation)
11. What proportion of the workforce receive formal performance appraisals?
Chapter 6 (Motivation)
12. Which of the following promotion decision rules do you
use most often? (a) merit or performance rating alone; (b)
seniority only if merit is equal; (c) seniority among...
face numerical data all the time
newspapers, sports magazines, business
Statistical techniques are used to make
decisions that effect our daily lives
Insurance companies use statistics to set rates
for different insurance
City corporation may want to examine the...
Glossary of Terms
Tabloid Refers to a newspaper smaller in size as compared to the broadsheet newspaper. E.g Mid-Day, Mumbai Mirror etc. Tear Sheet Refers to the page clipped from a newspaper or magazine as proof that an ad has appeared as scheduled. An invoice to seek payment normally accompanies it...
random sampling, every sample of a given size in the accessible population has an equal chance of being selected.
Random sampling allows generalizability to a larger population with margin of error that is statistically determinable. Random sampling allows the use of inferential statistics...
reliability is a statement (usually quantified) about the degree of uncertainty associated with a statistical inference.
inflation – upward movement of prices
deflation – downward movement of prices
examples of using statistics in business:
What cc do ppl use most for cc purchases? – pop/all cc...
people/clients . And pick and explain tables, charts, and graphs with a suitable data from books, magazine or internets.
There are mainly two types of table we use on Statistics. They are:
Simple and complex table: The distinction between simple and complex tables is based upon the number of...
want to compute these confidence intervals yourself, use these Excel equations (N is sample size; alpha is 0.05 for 95% confidence, 0.01 for 99% confidence, etc.):
Lower limit: =SD*SQRT((N-1)/CHIINV((alpha/2), N-1))
Upper limit: =SD*SQRT((N-1)/CHIINV(1-(alpha/2), N-1))
What is the SEM?
digital divide for example in the sense that everyone gets access to a computer could well lead to an increase in more traditional communication gaps. More equal access to electronic media could mean less equal access to magazines, books and newspapers. Realising that there are many people who, for...