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The following time series data represent the yearly amounts spent on advertising (in millions of dollars) by a large toy company:
23.3, 21.7, 22.7, 25.5, 22.7, 25.9
This series of data begins in year 1997(i.e., time period t=1 corresponds to 1997). Using regression analysis, a linear trend line of the form Tt=21.77 + 0.53t was fit to the data. Using this information, generate a forecast for the total yearly amount of money that will be spent on advertising in 2006.
Would it be sensible to conclude that more than 10% of applicants are now failing the test?
Does all statistical data have a mean, median, or mode? Why? When is the mean the best measure of central tendency? When is the median the best measure of central tendency?
Construct a scatterplot for the (x, y) values below, and answer the following questions. What would be the slope of this regression line?
Write the null and alternative hypotheses for testing if participants and non-participants differ in level of problem behavior (Y).
Mean=63.6 Standard deviation=2.5 If 36 data points are arbitrarily chosen, determine the probability that mean is less than 64.
Explain how we test independent against dependent variables in a regression analysis? What's the set up? How are regression analyses often misused / misinterpreted at work or in the news? Cite an example.
If there is relationship between parental income and SAT score, why can't we bring to a close that differences in score are caused by differences in parental income.
Ryan is planning to finance her college education by selling programs at the football games for her team. there is a fixed cost of $400 for printing these programs, and the variable cost is $3.
Use this poll result to give 70%, 80%, 90% and 99% confidence intervals for the proportion of all adults who feel this way. What do your results show about the effect of changing the confidence level? (Use Excel)
Listed below are the commissions earned ($000) last year by the sales representatives at the Furniture Patch, Inc.
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10.
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
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