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Maxwell's Hot chocolate is concerned about the effect of the recent yearlong coffee advertising campaign on chocolate sales. The average weekly hot chocolate sales two years ago were 984.7 pounds and the standard deviation was 72.6 pounds. Maxwell's has randomly selected 30 weeks from the past year and found average sales of 912.1 pounds.
(a) State appropriate hypotheses for testing whether hot chocolate sales have decreased.
(b) At the 2 percent significance level, test these hypotheses.
a box of 7 usb flash drives contains 3 defective flash drives. a random sample of 2 is selected and tested. let x be
Compare the estimates (that is, the centers of the intervals) and margins of error. What is the major difference between the two approaches for these data
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a physician wants to develop criteria for determining whether a patients pulse rate is atypical and she wants to
Students voluntarily join groups based on how often the groups will meet. The groups are designated as meeting weekly, meeting only before exams.
The Centers for Disease Control and Prevention noted that "the price of a pack of cigarettes went up 90% between 1997 and 2003
What is meant by Explained in the table, and what is the origin of the information listed under that source?- How many levels of exercise price were used?
The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years.
How many subsets of S contain either the number 6 or the number 15?
What is the range, mean, variance, and standard deviation of that population data set?
Find the 95% confidence interval for the mean amount of soda in a serving. You cannot assume the underlying population is normally distributed.
Create a bell curve chart that shows the number of men needed per day for a 10,000 man hour job. The start date is 1/1/2008 and the end date is 6/1/2008.
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