Business Statistics: A First Course (8th Edition)
8th Edition
ISBN: 9780135177785
Author: David M. Levine, Kathryn A. Szabat, David F. Stephan
Publisher: PEARSON
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Which term describes a response that varies greatly from the majority of the other responses in survey?
a. Mean
b. Outlier
c. Median
d. Midpoint
Researchers examined the influence of a television program on children's aggressiveness. The number of aggressive responses was measured during an observation period after viewing the television program. Imagine that the known national average for number of aggressive responses typically performed by children who do not watch television is 6.847. Use the data below to conduct an analysis to determine if the number of aggressive responses on average is different from the national average. The data for this study can be found in the datafile: nresponses.csv.
What is the null and alternative hypotheses in words and symbols?
Is the assumption(s) met? Please explain your answer and proceed with the analysis even if the assumption(s) is not met.
What do you conclude from your analysis?
Based on your response in “c” above, identify and explain the type of error you could be making.
From 1985 to 2006 the net sales for the J.M. Smucker Company increased from $157 million to $687 million. Compute the mean annual percent increase in net sales.
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- Calculate t for a comparison for repeated-measures data?arrow_forwardFind the z-score that corresponds to the 63rd percentilearrow_forwardA random sample of soil specimens was taken from a large geographic area. The specimens can be assumed to be independent. The amount of organic matter, as a percent, was determined for each specimen. The data are below:0.14, 0.32, 1.17, 1.45, 3.5, 5.02, 5.09, 5.22A soil scientist wants to know whether the population mean percent organic matter is different than 4%. Asignificance level of α = 0.05 is chosen. (a) State hypotheses appropriate to the research question. (b) Graph the data as you see fit. Why did you choose the graph(s) that you did and what does it (do they) tell you? (c) Regardless of your conclusion from (b), use the bootstrap to perform a test of the hypotheses you stated in (a). Use B = 8000 resamplings. Compute the p-value, and make a reject or not reject conclusion. Then state the conclusion in the context of the problem. In other words, does it seem the mean organic matter level is different than 4%? (d) Regardless of your conclusion from part (b), use a T…arrow_forward
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