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Question: Researchers asked a sample of 50 1st grade teachers and a sample of 50 12th grade teachers how much of their own money they spent on school supplies in the previous school year. They wanted to see if teachers at one grade level spend more than teachers at the other grade level.
a. What type of study is found-observational or randomized experiment? Explain.
b. What is the experimental (or observational) unit?
c. What is the response variable?
d. What is the explanatory variable?
e. Do we have to worry about confounding variables in this instance? Why? If so identify a possible confounding variable?
f. Are either of the terms retrospective study or prospective study relevant? Explain.
Draw a scatter diagram. Based on the scatter diagram, does there appear to be any relationship between the number assemblers and production? Explain.
Which measure of association do you use to compare the relationship between these variables? Why?
Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution
firms with a reputation for ethical behavior in strategic alliances are likely to have more opportunities to form
Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security relatd jobs and found that 1,143
The average U.S. family includes 3.13 persons. To determine whether families in her city tend to be smaller in size compared to those across the United States, a city council member selects a simple random sample of 25 families.
Suppose that you perform a significance test regarding a population mean and that the evidence does not warrant rejection of the null hypothesis.
Complete the table and answer the following questions. Use the .05 significance level. How many treatments are there? What is the total sample size?
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
1.For a sample size of 100 determine the crtitical value for a two-tail hypothesis test at a 5% level of significance when the population standard deviation is unknown
A description of how you believe statistics can enrich and represent the results of a study, and an explanation of how statistics can be used to misrepresent the results of a study.
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