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A research team conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product. Of the participants, 130 are teenagers and 130 are adults. The researchers secured the following results:
Teenagers: Cola 50 Nocola 80
Adults: Cola 90 Nocola 40
Calculate an appropriate measure of association.
Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
Formulating null and alternative hypothesis to test the claim averaging about $5000.
Determine if there is a linear correlation between annual income and the amount of insurance? What is the linear regression line for this data?
Find out the probability that at least one of the CD's is defective?
If two randoom samples of sizes n1 = 30 and n2 = 36 are selected independently from two populations with mean 78 and 85, and with standard deviations 12 and 15, respectively, then the standard error of the difference between Xbar1 and Xbar2 are eq..
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
At the .10 significance level you will test to determine if there has been an increase in selling time. Is this a 1 or 2 tail test?
With a major expansion planned, Judy projects sales next year to increase to 1,200 radials. What will the demand be each season? Please show work (formulas).
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
Dana and Cathy are playing tennis. The probability that Dana wins at least one out of two ames is 0.3. What is the probability that Dana wins at least one out of four?
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
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