Program to Decrease Littering in California
Not what you're looking for?
A program to decrease littering was carried out in four cities in California's Central Valley starting in August 2000. The amount of litter in the streets (average pounds of litter collected per block per day) was measured during the July before the program was started and then the next July, after the program had been in effect for a year. The results were as follows: Using the 1% level of significance, was there a significant decrease in the amount of litter? (a) Go through the five steps of hypothesis testing. (b) Illustrate your answer with a histogram of the sample's difference scores and sketches of the population distribution (of difference scores) and the distribution of means (of difference scores), showing the t score and cutoff points for significance. c) Explain your answer to someone who understands mean, standard deviation, and variance, but knows nothing else about statistics.
Purchase this Solution
Solution Summary
This solution goes through the five steps of hypothesis testing and illustrates this with a histogram and population distribution.
Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.