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Hypothesis Testing, T-Tests, Cross-Tabulations, and Chi-Square
This section examines hypothesis testing, and calculating and interpreting basic parametric and non-parametric tests. You will learn the difference between a null and alternative hypothesis, and how to set up the hypothesis (the specific symbolic components that are often used in testing hypotheses). You will explore the difference between one- and two-tailed testing, and also determine the importance of the P-value for setting up proper hypothesis testing. Type I and Type II errors should be understood in the context of hypothesis testing, and how increasing or decreasing the level of rejection can lead to greater levels of certain types of errors. The second part of this section is an introduction to cross-tabulations, Chi-Square, t-tests, and One-Way ANOVA parametric and nonparametric measures. Importance is placed on calculating these tests through the use of statistical software, as well as analyzing and interpreting their results. In addition to manipulating computations, the conceptual basis of each test will be explored.
q1. listed below is the net sales in million for home depot inc. and its subsidiaries from 1993 to 2004.yearnet
What is the percentile rank for X=6? What is the percentile rank for X=9? For the following scores, the lowest value is X=13. Place the scores in a frequency table using.
Suppose a small bicycle manufacturer makes cheap bikes that sell for 180$ each. The total cost of producing x bikes (in $) is given by c(x)=6000+240x-0.8x^2, where x is up to 200 bikes.
Determine the probability, using binomial distribution, of obtaining 4 or more nonconforming units when sampling 30 computers from batch known to be 10% nonconforming.
three-way catalytic converters have been installed in new vehicles in order to reduce pollutants from motor vehicle
At 0.05 significance level, is there a difference in the mean number of defects per shift? Assume that the populations are approximately normally distributed and the variances are equal.
suppose we draw k cards out of a deck. what is the probability that we do not draw an ace? is the answer larger or
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
A multiple regression equation for list price of homes in certain community in USA is=170,000 -850 X 1 + 28,000 X 2 , where X 1 signifies age in years and X 2 signifies number of rooms.
a survey is conducted to estimate the percentage of pine trees in a forest that are infected by the pine shoot moth. a
five students ann betty clint douglas and edward are rated equaly qualified for admission to law school ahead of other
the nypd precincts in manhattan are numbered from 1 to 34. if the variable precinct is included in a dataset about
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